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Dear REX friends and users: According to the national statutory holiday arrangements, the notice of our company's 2022 NEW Year arrangements is as follows: We will be closed from 12-30-2021 to 01-03, 2022, and will go to work on 01-04-2022. In the meantime, we apologize for the inconvenience caused. The New Year is coming,REX wishes you: Family reunion and family happiness, family and friends bless you. Congratulations to the New Year for good health, success and prosperity. Happy Chinese New Year! Thank you for your continued support to REX, we will strive to provide better products and services!

The 2021 15th China Scientific Instrument Development Annual Conference (ACCSI2021) will be held in Wuxi Sunac Wanda Vista Hotel Conference Center on April 21-23. After 14 sessions of development, ACCSI2021 will take "Innovative Development, Industrial Co-progress" as the theme, and nearly 1,400 high-end individuals from the scientific instrument and inspection and testing industries will participate. As a representative enterprise of domestic scientific instruments, Shanghai INESA was invited to attend this grand event. In the instrument and testing awards ceremony held on the afternoon of the 22nd, the annual lists of various categories were announced. Among them, the annual selection list of "Leading Enterprise in the Scientific Instrument Industry" has been successfully held for thirteen sessions so far. It is one of the most authoritative awards in the industry and aims to commend those who have performed this year in terms of company development, user attention, brand awareness, etc. Prominent enterprise. Shanghai INESA has been deeply involved in the scientific instrument industry for more than 80 years and has won the award for many years. This time it has lived up to expectations and won the award again. "REX" is the independent brand of Shanghai INESA Scientific Instrument Co., Ltd., founded in 1940, is China's first national brand of analytical instruments. With more than 80 years of inheritance and innovation, focusing on electrochemical instruments and water quality analysis, "Lei Magnetics" fulfills its original intention and assumes its mission, continues to maintain its domestic leadership, actively expands its international competitiveness, and makes unremitting efforts to protect the safety of water quality.

1. Background introduction The total acid in food refers to the total amount of hydrogen ions that can eventually be released in the food. It is a fixed number and refers to the total amount of all acidic components in the food. The determination of total acid content in food can distinguish different product attributes, compare the flavor of the food, determine the stability of the food, and avoid corruption. GB 12456-2021 "National Food Safety Standard Determination of Total Acids in Foods" was released on February 22, 2021 and implemented on August 22, 2021. 2. Standard Introduction GB 12456-2021 "National Food Safety Standard Determination of Total Acids in Foods" replaces GB/T 12456-2008 "Determination of Total Acids in Foods"; replaces GB/T 4928-2008 "Methods of Analysis of Beer", GB/T 5009.39- 2003 "Analytical Method for Hygienic Standard of Soy Sauce", GB/T 5009.40-2003 "Analytical Method for Sauce Hygienic Standard", GB/T 5009.41-2003 "Analytical Method for Hygienic Standard of Food Cool", GB/T 10345-2007 "Analysis of Liquor Method", GB/T 21999-2008 "Oyster Sauce" Determination method of total acid. Compared with GB/T 12456-2008, the main changes of this standard are as follows: --The name of the standard was revised to "National Food Safety Standard Determination of Total Acid in Food" --Modified the scope of application of the standard --Added "potentiometric titration method" --Modified some technical parameters and method names of "acid-base titration" and "pH potential method" 3. Determination method of total acid in food Method: The third method The automatic potentiometric titration method is suitable for the determination of total acid in fruit and vegetable products, beverages, alcohol and condiments. Instrument: Thunder Magnetism Automatic Potentiometric Titrator (ZDJ-4A/4B/5B)

REX's "Electrochemical Analysis Instrument" standard was awarded the "Shanghai Standard" in 2021-advanced standards lead the new development of scientific instruments In accordance with the domestic leading and internationally advanced requirements, the 2021 "Shanghai Standard" was released a few days ago. On the afternoon of October 22, 2021, the "Shanghai 2021 World Standards Day Theme Event and 2021 "Shanghai Standards" Release Ceremony" will be held in the Golden Hall of Shanghai Mart. Eleven standard projects were awarded the "Shanghai Standard", and the "Laboratory L Series Electrochemical Analysis Instrument" of Shanghai INESA (Group) Co., Ltd. was successfully selected. At the press conference, Chen Tong, Deputy Mayor of the Shanghai Municipal People's Government, issued a certificate to the 2021 Shanghai Standard. The "Shanghai Standard" is an important measure taken by Shanghai to strengthen the construction of the "Five Centers", the digital transformation of the city, the development of the "3+6" industry, and the construction of people's cities around the "four major brands". The "Shanghai Standards" evaluation focuses on the advancement and innovation of the standards, and the effectiveness of the implementation of the standards. This year is the second year of the implementation of the "Shanghai Standard" labeling system. It took 6 months to finally select the advanced standard projects that represent the industry from many candidate projects. Shanghai INESA Scientific Instrument Co., Ltd. (hereinafter referred to as Shanghai INESA) is one of the most influential scientific instrument manufacturers in China and a leader in the scientific instrument industry. Its own brand "Lei Magnetic" was established in 1940. It is the birthplace of China's first pH meter and the first glass electrode, and an important birthplace of China's analytical instruments. After more than 80 years of development, from China`s first PH meter to a fully automatic electrochemical analysis system, from a series of intelligent water quality analysis instruments to system solutions, "REX" has always insisted on leading technology, stable quality, and leading the market. Expansion, cultural enhancement, service optimization, and fine management to improve the core competitiveness of products, enhance brand reputation, and enhance market influence, thereby improving the comprehensive competitiveness of enterprises, actively responding to the domestic substitution of high-end scientific instrument manufacturing by the government, and assisting scientific instrument refinement Solve the "stuck neck" problem in different areas. It has successively launched domestic leading and internationally advanced electrochemical analysis instruments and electrochemical sensors, filling the domestic gap in high-precision pH meters, full-scale conductivity meters, automatic photometric titrators, and automatic temperature titrators. The analytical instrument industry takes the lead, catching up with the world's first-class products.

1. Background introduction Soil conductivity (soil conductivity) refers to the ability of the soil to conduct electricity, which is expressed by measuring the conductivity of the soil extract. The unit of measurement result is expressed in mS/m (ie 10μS/cm). When the measurement result is greater than or equal to 100mS/m (ie 1000μS/cm), three significant digits are retained; when the measurement result is less than 100mS/m, it is retained to one decimal place. Soil conductivity is the sum of anions and cations in the soil extract, which represents the salt content of the soil. Measuring soil electrical conductivity can directly reflect the content of soil mixed salt, which is of great significance for determining the difference in the temporal and spatial distribution of various field parameters, and thus lays the foundation for the popularization of modern precision agriculture based on information and knowledge. 2. Test principle The national standard HJ 802-2016 "Electrode Method for the Determination of Soil Electrical Conductivity" gives a method for the determination of soil electrical conductivity. It is required to take natural air-dried soil samples and add water at a ratio of 1:5 (m/V) (the conductivity is not Above 0.2mS/m, that is 2μS/cm), shake and extract at 20℃±1℃, and then measure the conductivity of the extracted solution at 25℃±1℃ with a conductivity meter. It should be noted that when the conductivity of the extracted solution of the soil to be tested is less than 1mS/m (that is, 10μS/cm), carbon dioxide and ammonia in the air have a greater impact on the measurement of conductivity. Operate in a closed small space. Can eliminate or reduce its interference. 3. Measurement Method Sample prepare---Calibration---Sample prepare--- Measurement (1) Sample preparation ● Collect, prepare and store samples in accordance with the relevant regulations of HJ/T 166. (2) Calibration ● Configure conductivity standard solution or use commercially available conductivity standard solution ● Use conductivity standard solution to calibrate the conductivity meter (3) Sample preparation ● Weigh 20.00 g of soil sample into a 250 ml shaker bottle, add 100 ml water at 20°C±1°C, cap the bottle, place it on a reciprocating horizontal constant temperature shaker, and shake at 20°C±1°C for 30 minutes. After standing for 30 minutes, filter or centrifuge, and collect the extract in a 100 ml beaker for testing. ● Make blank samples in the same steps (4) Measurement ● Rinse the electrode several times with water, and then rinse the electrode with the extraction solution to be tested. Insert the electrode into the extraction solution to be tested, and correct the temperature to 25℃±1℃ in accordance with the requirements of the instruction manual of the conductivity meter, and measure the conductivity of the soil extraction solution. Read the conductivity value directly from the conductivity meter, and record the temperature of the extract at the same time. ● The same procedure is used to test the blank sample. The blank conductivity value should not exceed 1mS/m (ie 10μS/cm). Otherwise, you should find the reason and re-measure. ● Record the measurement results.

1. Importance of urea content detection in swimming pools Friends who have been engaged in the swimming pool water treatment industry should know that the urea content is included in the project indicators of the annual sampling inspection by the health supervision department. The urea content in the swimming pool water quality sanitation standard is specified to be ≤3.5mg/L. If it exceeds this range, it indicates that the urea in the water has exceeded the standard. Excessive urea not only seriously affects the water quality of swimming pools, but is also very likely to cause damage to skin and mucous membranes. The detection of urea content can better reflect the newness of the pool water. Therefore, the detection of urea content in swimming pool water is an important detection index in the swimming pool water quality sanitation standard. At present, there are two treatment methods for swimming pool urea exceeding the standard, namely, supplementing new water and using urea degradation agent. 1. Replenishing new water: It is necessary to continuously inject new water into the swimming pool and discharge the old water every day. After one cycle, the water in the swimming pool is naturally replaced with new water, and at least 10% of the new water is added, especially during the peak swimming season. 2. Urea degrading agent: Urea degrading agent is a method that can quickly treat water quality urea. Generally, it can completely remove urea in water in about 8 hours, which is very suitable for use when urea is seriously exceeded or quickly processed. 2. Urea detection method 1. Principle The reaction of urea with diacetyl monooxime and antipyrine appears yellow. The absorbance of the sample is measured at a wavelength of 470 nanometers, and the absorbance is linearly related to the urea content to determine the urea content in the sample. 2. Scope of application Measurement of urea in swimming pool water, surface water, sewage and other water bodies. 3. How to use a portable water quality tester to test the content of urea in a swimming pool (DGB-423) The DGB-423 portable water quality analyzer (hereinafter referred to as the instrument) is a multi-parameter water quality analyzer with very high analysis accuracy. Adopting new LED test technology, integrating LED light source with specific absorption peak wavelength of 470nm, adopting diacetyl monooxime-antipyrine spectrophotometry, abandoning the complex and heavy optical path system of traditional spectrophotometer, and the instrument has a small size. Convenient operation and other advantages, directly using the colorimetric tube as the measuring container, greatly convenient for users.

The performance of the pH meter is inseparable from the good maintenance of the instrument, in addition to the structure of the instrument itself, especially the pH meter, which must have a high input impedance, and the use environment is often exposed to chemicals. Therefore, reasonable maintenance is necessary. The specific maintenance is as follows: a) The input end of the instrument (ie the composite electrode socket) must be kept highly clean, and the Q9 short-circuit plug should not be removed frequently to prevent dust and high humidity from entering. b) If the instrument is equipped with an electrode converter, it should be protected from moisture and dust at ordinary times. c) During measurement, the lead-in lead of the electrode should be kept still, otherwise the measurement will be unstable. The power supply used by the instrument should be well grounded. d) The electrode head of the composite electrode is very thin, therefore, do not touch hard objects to prevent damage to the electrode. e) The head of the composite electrode should not be in contact with dirt. If it is found to be contaminated, wipe the electrode head with medical cotton or clean it with 0.1mol/L dilute hydrochloric acid. f) When calibrating the instrument with a buffer solution, ensure the reliability of the buffer solution, because the low precision of the buffer solution will cause errors in the measurement results. g) Please do not allow strong sunlight to shine directly on the LCD for a long time to prolong the service life of the LCD. It is necessary to prevent the impact of hard objects from scratching the surface glass of the display.

1. Background introduction Pure drinking water, engine cooling water, boiler feed water and other pure water or ultrapure water samples have clear requirements for water quality pH. When the pH deviates from the normal range, it often means that the water quality deteriorates and the equipment may be damaged. Compared with buffer solutions and conventional samples, the pH measurement of ultrapure water and pure water is often more difficult. Because pure water ionizes few ions and high resistance, ordinary pH electrodes will have problems such as slow response, drift of indication, poor repeatability, low accuracy, and short life during the measurement process. The main reason for this situation is that the traditional reference structure has unstable potential in pure water test applications, requires a long time to balance, and is prone to liquid junction potential errors. On the other hand, ordinary electrodes have large internal resistance and slow response, making it difficult for the electrodes to reach equilibrium. The REX 962221 ultrapure water pH composite electrode is tailor-made for ultra-low conductivity samples. The structure adopts a long-life reference system and a multi-stage reference structure to reduce the error of pure water pH testing; adopts a high-precision glass grinding port to optimize the flow rate design; adopts an optimized low-resistance sensitive membrane for faster response. This makes the pH test of pure water samples faster, more stable and more accurate. 2. Determination of pH value of pure water and ultrapure water samples In this experiment, REX 962221 ultrapure water pH composite electrode (A), a well-known foreign brand pure water special pH electrode (B) and conventional electrode E-201-C pH composite electrode (C) were used to test drinking pure water and Ultrapure water sample. Before the test, the electrode was activated in 3M KCl solution for 2 hours, rinsed with deionized water, and inserted into pH 4.01 and pH 9.18 standard solutions for calibration. Set the instrument parameters, put the electrode in freshly prepared ultrapure water or other water samples, read the data every 5 seconds, and record the readings After several tests of drinking purified water, the following data chart is obtained. Comparing the test results of 3 electrodes, it can be seen that after more than two hundred seconds, the REX 962221 ultrapure water pH composite electrode (A) and a well-known foreign brand pure water pH electrode (B) The pH data of E-201C tends to be stable, maintaining 6~7 pH; the pH value of the conventional E-201C electrode (C) has been getting smaller and it is difficult to stabilize. The same applies to the test of ultrapure water, the measurement result of the ultrapure water electrode also tends to be stable after two to three hundred seconds. The pH of the obtained ultrapure water is maintained between 5.80 and 6.00.

The conductivity and TDS is about 1:2. TDS refers to total dissolved solids (English Total dissolved solids, abbreviated TDS), also known as total dissolved solids, the measurement unit is milligrams per liter (mg/L), which indicates how many milligrams of dissolved solids are dissolved in 1 liter of water. The higher the TDS value, the more dissolved substances contained in the water. Total dissolved solids refers to the total amount of all solutes in water, including both inorganic and organic content. Generally, the conductivity value can be used to roughly understand the salt in the solution. In general, the higher the conductivity, the higher the salt, and the higher the TDS. In inorganic substances, in addition to ionic components, there may also be molecular inorganic substances. Since organic matter and molecular inorganic matter contained in natural water are generally not considered, the salt content is generally referred to as total dissolved solids.

1. Background introduction At normal temperature and pressure, the dissolved oxygen content in water is generally 6-10 mg/L. In some water bodies, the dissolved oxygen content in the water will increase significantly due to some reasons, leading to rich oxidation in the water body, and the dissolved oxygen content can reach more than 20mg/L. For example, rivers and lakes contain a lot of aquatic plants. When the weather is fine, the oxygen released by the photosynthesis of aquatic plants will cause the water body to be oxidized; there are also some waters that cause dissolved oxygen in the water due to aeration or the use of pressurized dissolved oxygen measures. The concentration is greatly increased, and common aeration tanks and oxygen-enriched beverages are common. There are many ways to measure dissolved oxygen, among which two methods are mostly used to measure dissolved oxygen in oxygen-rich water: Method principle 1. Iodometry Manganese sulfate and alkaline potassium iodide are added to the water sample. Dissolved oxygen in the water will oxidize low-valent manganese into high-valent manganese, forming a brown precipitate of tetravalent manganese hydroxide. After acid is added, the hydroxide precipitates and dissolves and reacts with iodide ions to release free iodine. Using starch as an indicator, titrate the released iodine with a standard solution of sodium thiosulfate, and calculate the dissolved oxygen content based on the consumption of the titrated solution. 2. Electrode method Use coated dissolved oxygen electrode or fluorescent dissolved oxygen electrode to measure dissolved oxygen content. Compared with the iodometric method, the electrode method test process is simpler, more convenient and accurate. However, the effective range of the common dissolved oxygen meter on the market at present is mostly 0-20mg/L, and it is incapable of measuring oxygen-enriched water with a dissolved oxygen content of more than 20mg/L. After exploration, the technical research and development personnel of Raymagnet successfully expanded the effective range of the instrument from the conventional 0~20mg/L to a higher range, thus solving the problem of detecting high concentration of dissolved oxygen in an oxygen-rich environment. 2. REX dissolved oxygen meter test oxygen enrichment (1) Recommended instruments: JPSJ-606L dissolved oxygen meter, JPBJ-609L portable dissolved oxygen meter (2) Recommended electrode: DO-958-L dissolved oxygen electrode (3) Reagents: zero oxygen solution, saturated dissolved oxygen solution, etc. (4) Sample: oxygen-enriched water sample to be tested (5) The measurement process is as follows: Electrode preparation---Instrument Calibration---Sample Calibration (6) The measurement results of the samples prepared by our company: During the experiment, at a constant temperature of 5°C, a nitrogen-oxygen mixture with 95% oxygen content was passed through the ultrapure water to saturation, and then the lightning magnetic dissolved oxygen recommended in this program was used The analyzer determines the dissolved oxygen content, and the experimental value is close to the theoretical value of 58.045 mg/L, the error is within 1%, and the experimental result is reliable. JPSJ-606L Benchtop Dissolved Oxygen Meter MEASUREMENT PARAMETERS Dissolved Oxygen, DO Saturation, Temperature FEATURES ² 7" Colorful touchscreen and smart guide system. ² Intelligent operation system provides features including user management, calibration management, electrode management, method management, data management and etc. ² 1 or 2 points calibration using the air-saturated water or zero oxygen solution. ² Multi-reading feature allows auto-read, timed-read and continuous-read. ² Automatic temperature compensation ensures accurate results. ² Automatic/Manual barometric pressure compensation. ² Auto-hold feature senses and locks the measurement endpoint. ² Over 20 settable parameters, including number of calibration points, stability criteria temperature unit, etc. ² Data capacity of up to 1000 sets (GLP-compliant). ² Data analysis feature helps user review, compare and recalculate results. ² Data can be transferred to PC or printer by USB or RS-232 communication interfaces. METER INCLUDES DO Probe, Electrode Holder Model JPSJ-606L DO Range (0.00~90.00)mg/L Resolution 0.01mg/L Accuracy ±0.10mg/L DO Saturation Range (0.0~600.0)% Resolution 0.1% Accuracy ±2.0% Temperature Range (-5.0~130.0) ℃ Resolution 0.1 ℃ Accuracy ±0.1 ℃ General Power Supply 100-240V, 50/60Hz Dimension (mm); Weight (kg) 280*280*130; 2.5 JPBJ-609L Portable Dissolved Oxygen Meter MEASUREMENT PARAMETERS ORP, DO Saturation, Temperature. FEATURES ² 4.3" TFT colorful touchscreen and smart guide system. ² Intelligent operation system provides features including user management, calibration management, electrode management, method management, data management and etc. ² 1 or 2 points calibration using the air-saturated water or zero oxygen solution. ² Multi-reading feature allows auto-read, timed-read and continuous-read. ² Automatic temperature compensation ensures accurate results. ² Automatic/Manual barometric pressure compensation. ² Auto-hold feature senses and locks the measurement endpoint. ² Over 20 settable parameters, including number of calibration points, stability criteria temperature unit, etc. ² Data capacity of up to 2000 sets for each parameter (GLP-compliant). ² Data analysis feature helps user review, compare and recalculate results. ² Data stored can be transferred into the computer by USB communication interface. ² Reset feature automatically resumes all settings back to factory default options. METER INCLUDES DO Probe, Carrying Case Model JPBJ-609L DO Range (0.00~99.99)mg/L Resolution 0.01mg/L Accuracy ±0.10mg/L DO Saturation Range (0.0~600.0)% Resolution 0.1% Accuracy ±2.0% Temperature Range (-5.0~130.0) ℃ Resolution 0.1 ℃ Accuracy ±0.1 ℃ General Power Supply Li-ion Battery (DC: 3.8V) Dimension (mm); Weight (kg) 201*96*55; 0.3

With the approval of the State Council, the Ministry of Human Resources and Social Security will hold the National Vocational Skills Competition from 2020. The First Vocational Skills Competition of the People's Republic of China was held in Guangzhou from December 10th to 13th, and the competition kicked off on the morning of the 10th. With the theme of "New Era, New Skills, New Dreams", the first competition set up 86 competitions, with a total of more than 2500 contestants and more than 2,300 referees participating in the competition. The competition draws on the concept and model of world competitions and introduces technical standards and competition It is a comprehensive national professional skills competition with the highest specifications, the most projects, the largest scale and the highest level since the founding of the People`s Republic of China. The skill competition has the meaning of "weathervane". Relying on high-quality products and high-quality services, [REX" successfully won the bid of the first National Vocational Skills Competition Water Treatment Technology Project Equipment and Equipment Purchase Project for the PHS competition. In addition, Lei Magnetic also sponsored the WZB-175 turbidity meter for the turbidity detection project in the water treatment technology project of the competition. Our on-site engineers follow up the entire process from entering the museum, to assembly and setup, calibration and commissioning, on-site support, etc., to escort the smooth holding of the contest and obtain high recognition from the organizer.

On December 16-18, 2020, the "Fifteenth World Pharmaceutical Machinery, Packaging Equipment and Materials China Exhibition" (P-MEC China 2020) will once again land at the Shanghai New International Expo Center. The exhibition focuses on thematic forums and special events on the topics of sterile preparations, solid preparations and traditional Chinese medicines, pharmaceutical factory intelligent manufacturing, biological preparations, API production, clean plant management, green pharmaceuticals, etc., presenting the overall global development trend and production technology of the pharmaceutical machinery industry , Optimization and updating of machinery and equipment, in-depth communication and cooperation, and multi-angle discussion of industry development As an important birthplace of China's analytical instruments, Shanghai INESA will bring its products under the "REX" brand to this grand event. At the same time, there will be a variety of new products and solutions gathered at this exhibition. We sincerely invite you to visit and communicate And seminars, please come!

1. What is mercaptan sulfur in oil? Mercaptans are a class of non-aromatic compounds containing sulfhydryl functional groups (-SH). The structure is equivalent to the replacement of oxygen in alcohols by sulfur, such as ethanol (commonly known as alcohol) CH3CH2OH and ethyl mercaptan CH3CH2SH. There are a small amount of mercaptan compounds in petroleum products. The presence of mercaptan not only causes the oil to have an unpleasant smell, but also transforms into toxic and corrosive sulfur dioxide and sulfur trioxide during combustion, which is harmful to the elastic materials of the fuel system. It also corrodes the components of the fuel system, affecting the life of related machinery, such as automobile engines. Therefore, it is very important to control the mercaptan content in petroleum products. 2. The sulfur contained in mercaptan in oil is called mercaptan sulfur content. National standards mandate the mercaptan sulfur content in a series of oil products such as gasoline, diesel, kerosene, distillate fuel, and jet fuel. So how to determine the content of mercaptan sulfur in oil? . Use potentiometric titrator to determine mercaptan sulfur content in oil (1) Instrument: REX ZDJ-5B Automatic Potentiometric Titrator (2) Electrodes: 216 type silver electrode and 231-01 type pH glass electrode. (3) Reagents: ultrapure water, 1-butanethiol, 1-heptanethiol, potassium iodide, concentrated nitric acid, isopropanol, sodium acetate, sodium sulfide, silver nitrate, etc. (4) Sample: commercial gasoline; butane mercaptan standard solution (5) The measurement process is as follows: Electrode pretreatment ----- Standard solution----- Blank titration----- Sample Measurment FEATURES ² 7" colorful touchscreen and smart guide system. ² Titration methods, curves and results are displayed in detail. ² 1 extra burette driver can be installed (optional). ² Replaceable burette with high-accuracy (10 ml or 20 ml selectable). ² Intelligent operation system provides features including user management, method management, electrode management, titrant management, data management, etc. ² Support the following titration modes: DET (dynamic equivalence point titration), MET (monotone equivalence point titration), SET (Preset Endpoint Titration) and MAT (manual titration). ² pH calibration and measurement are supported. ² Up to 100 user-defined methods and 10 user-defined shortcuts. ² Auto calculation with pre-defined formula. ² Store up to 200 titration data sets (GLP-compliant). ² Data analysis feature helps user review, compare and recalculate results. ² Data can be easily transferred to printer via RS-232 communication interface.. ² Titrator can be controlled by computer via USB or RS-232 communication interface. ² Automatic sampler is supported.

The 13th China International Food Safety Technology Forum of CBIFS 2020 was held in Shanghai Fuyue Hotel from December 10th to 11th. This forum will discuss hot issues such as rapid testing, analytical techniques, sample pretreatment, pesticide and veterinary drug residues, pathogenic microorganisms, biotoxins, pollutants, adulteration identification, dairy products, grain, oil and food, laboratory certification and quality control. Shanghai INESA Scientific Instrument Co., Ltd. and Shanghai INESA Testing Technology Co., Ltd. under Yunsai Zhilian Co., Ltd. were invited to participate in this technical forum, and brought food testing solutions and application products to display on site, such as: food The ZDJ-4B automatic potentiometric titrator for quality testing, the DZS-708 multi-parameter analyzer for the analysis of physical and chemical indicators of beverages and dairy products, the PHBJ-261L portable pH meter, and the DDBJ-350F portable conductivity meter are used for The SJB-802 portable heavy metal ion analyzer for heavy metal detection, as well as the multi-wavelength multi-functional food detector SGB-8 and the multi-parameter water quality analyzer DGB-480 for rapid detection and analysis of food and water quality on-site.

The 18th China International Scientific Instruments and Laboratory Equipment Exhibition (CISILE2020) will be held on December 8-10, 2020 in Beijing·National Convention Center. CISILE is one of the large-scale and high-level international professional exhibitions in the field of domestic scientific instruments. It aims to strengthen the application of the industry and international exchanges, the transformation of scientific instruments, and promote the industrialization and modernization of scientific instruments in my country. As an important birthplace of China's analytical instruments, Shanghai INESA Scientific Instruments will bring a full range of products under its brands such as "INESA Analytical", "REX" and "INESA Physic" to the event, and there will be many new products at the same time Gathering at this exhibition, we sincerely invite you to visit, exchange and discuss, please come!

1. Introduction to condiments Condiments refer to supplementary foods that can increase the color, aroma, and taste of dishes, promote appetite, and are beneficial to human health. Condiments can be divided into salty condiments, sweet condiments, bitter condiments, spicy condiments, sour condiments, etc. according to their taste. In addition to the single-flavored condiments, there are also compound-flavored condiments, such as oil curry, sweet noodle sauce, milk curd sauce, pepper and salt. Table salt is the source of condiments, and all condiments, including compound flavors, are inseparable from table salt. The main ingredient of table salt is sodium chloride. Excessive intake of salt in the diet can cause high blood pressure. The World Health Organization (WHO) recommends that each person consume less than 6g of salt per day to prevent coronary heart disease and high blood pressure. Our country stipulates that adults can consume 6g of salt per day to meet the body's need for sodium. 2. Determination method of sodium chloride in condiments At present, the methods for determining chloride in food in national food safety standards include potentiometric titration, Volhard method (indirect precipitation titration method), and silver measurement method (molar method or direct titration method). Volhard method (indirect precipitation titration method) and silver measurement method (molar method or direct titration method) both use color to determine the end point. The condiments with complex flavors (sweet chili sauce, tomato sauce, oil curry) have their own color, It interferes with the judgment of the end point, so we use the potentiometric titration method to determine the chloride ion content in the compound flavor seasoning. 3. Use a potentiometric titrator to determine sodium chloride in condiments (1) Instrument: REX ZDJ-5B Automatic Potentiometric Titrator (2) Electrodes: silver titration electrode (U-shaped fork piece interface, customized) and 231-01 pH glass electrode. (3) Reagents: ultrapure water, nitric acid, acetone, silver nitrate standard titrant, etc. (4) Samples: sweet chili sauce, tomato sauce, oil curry (5) The measurement process is as follows: Standard Measurment---Blank Titration----Sample pretreatment---Sample Measurment. FEATURES ² 7" colorful touchscreen and smart guide system. ² Titration methods, curves and results are displayed in detail. ² 1 extra burette driver can be installed (optional). ² Replaceable burette with high-accuracy (10 ml or 20 ml selectable). ² Intelligent operation system provides features including user management, method management, electrode management, titrant management, data management, etc. ² Support the following titration modes: DET (dynamic equivalence point titration), MET (monotone equivalence point titration), SET (Preset Endpoint Titration) and MAT (manual titration). ² pH calibration and measurement are supported. ² Up to 100 user-defined methods and 10 user-defined shortcuts. ² Auto calculation with pre-defined formula. ² Store up to 200 titration data sets (GLP-compliant). ² Data analysis feature helps user review, compare and recalculate results. ² Data can be easily transferred to printer via RS-232 communication interface.. ² Titrator can be controlled by computer via USB or RS-232 communication interface. ² Automatic sampler is supported.

Mr.Wei Leqiao cordially received flowers, and people expressed warm congratulations and heartfelt thanks to Mr.Wei Leqiao on behalf of the party, government and employees of INESA. Mr. Wei Leqiao said with excitement, [Model worker is an honor, but it is more than an honor. It is more of a responsibility and a new requirement. As a model worker and an advanced representative of Shanghai INESA, I have the honor to attend the National Award for Model Workers and Advanced Workers. At the conference, I felt extremely proud and honored to listen to the teachings of General President Xi in person. President Xi`s words and heartfelt words are still in my ears. Mr.Wei Leqiao has been engaged in scientific instrument research and development in Leimag for more than 20 years. He has worked hard on research, continuous innovation, and excellence. He has achieved excellent results in the domestic scientific instrument research and development field. In recent years, he has obtained more than 30 various patents, including inventions. 9 patents. Comrade Wei Leqiao, as the leader of "Lei Magnetic" R&D work and the leader of "Wei Leqiao Electrochemical Instrument R&D Model Worker Innovation Studio", focuses on the research and development of electrochemical analysis instruments. The team continues to innovate and collaborate to tackle key problems. The technology of domestic electrochemical analysis instruments Push horizontally to a new height. The L series electrochemical analysis instrument developed by the team has advanced international technology and successfully passed the "Shanghai Brand" product certification; ZDJ-5B series automatic titration system fills the two technical gaps in domestic photometric titration and temperature titration; SJB-715 The portable in-situ water quality detector breaks through a number of sensing technologies and realizes in-situ water quality detection at a specific depth underwater. The above products have been recognized by scientific instrument industry associations, industry societies and authoritative media. They have won the "Independent Innovation Gold Award" of China Instrument and Meter Industry Association for many times, and have been awarded "Good Domestic Instruments", "Most Concerned Instruments in the Scientific Instrument Industry" and many more Honorary title.

The 8th Chinese Pharmacopoeia Analysis and Testing Technology Exchange and Seminar will be held at Nanjing International Expo Center from October 14th to 15th, 2020. This seminar is mainly for in-depth interpretation of the 2020 edition of the Chinese Pharmacopoeia, focusing on drug analysis and detection technologies. Shanghai INESA Scientific Instrument Co., Ltd. (referred to as Shanghai INESA) was invited to participate in this seminar and brought a theme report on "Application of Automatic Titrator in the 2020 Pharmacopoeia" and "Lei-ci" in the pharmaceutical industry Application products, such as ZDJ-5B-Y automatic titrator, ZDY-504 moisture analyzer, DZS-708L multi-parameter analyzer, PHSJ-6L laboratory pH meter, DDSJ-308F conductivity meter, PXSJ -216F ion meter, DGB-480 multi-parameter water quality analyzer, JBD-20 overhead stirrer, HY-2 vortex mixer, etc. We hereby sincerely invite everyone to visit our booth (Dream Lab DLC01) and give valuable advice. We look forward to in-depth exchanges with you face to face.

With 80 years of inheritance and innovation, "REX" stubbornly interprets the ups and downs of national instruments from scratch to strength. "REX" has become one of China's oldest scientific instrument brands, a well-known brand in China's scientific instrument industry, and a banner of domestic scientific instruments. With its strong technical background and the spirit of innovation and pioneering, it leads the electronics industry. 80 years of chemical analysis instrument technology. Today, REX has developed and formed a wealth of scientific instrument products, including electrochemical analysis instruments, titrators/moisture meters, colorimetric water quality analyzers, online water quality monitoring instruments, electrochemical sensors, chemical reagents and system integration, etc. In many categories, there are more than 170 types of equipment on sale, more than 200 types of sensors, more than 100 kinds of detection reagents, and more than 20 system solutions. The multi-type products have won awards such as "Good Domestic Instrument", "Most Concerned Instrument", "Independent Innovation Gold Award", "Excellent Product" and other awards, gaining a good market reputation. The company's business has developed rapidly, and the accumulated sales revenue and profit in the past 20 years are three times the accumulated sales in the previous 60 years. With excellent products and excellent service, REX has been awarded "Shanghai Famous Brand" and "Shanghai Famous Brand" successively. Its L series electrochemical analyzers have also passed the "Shanghai Brand" certification and become an outstanding representative of "Made in Shanghai" . REX presided over and participated in the formulation of nearly 40 national standards and industry standards, of which 18 were the first drafters. In recent years, it has undertaken more than 60 government scientific research projects including the "Major Special Project for Revitalizing Domestic Instruments" of the Ministry of Science and Technology, and has applied for a total of more than 200 patents and dozens of invention patents.

China World Expo was hold at the Shanghai New International Expo Center from August 13th to 15th, 2020. As a gluttonous feast for the environmental protection industry, Shanghai INESA Scientific Instruments Co., Ltd. has its own "Lei-ci" brand many water quality analysis instruments unveiled at the World Expo, helping the development of the environmental protection industry. At the exhibition site, there was an endless stream of customers. Among them, portable on-site water quality testing products are favored by customers, especially the colorimetric water quality multi-parameter analyzers DGB-480 and DGB-401, which can meet environmental protection and drinking water quality testing. The electrochemical method DZB-715 portable in-situ water quality detector and the portable multi-parameter electrochemical analyzer DZB-718L can well solve the on-site in-situ detection of pH, conductivity, dissolved oxygen, ORP and water temperature. Portable turbidity meter WZB-175/170 that conforms to the new ecological and environmental protection turbidity standard HJ 1075, water quality residual chlorine detection instrument DGB-402F/DGB-403F portable residual chlorine tester, TR-901 portable soil ORP meter, JPBJ The amount of consultation on popular items such as the -610L portable fluorescent dissolved oxygen meter is also high. The product series of online water quality monitoring exhibited at the same time, such as SJG-750 buoy-type surface water multi-parameter monitor for surface water monitoring, DWG-8002A ammonia nitrogen automatic monitor and COD-582 online chemical oxygen demand ( Environmental protection water quality monitoring products such as COD measuring instrument are also deeply loved by customers in the field of environmental protection equipment engineering and environmental monitoring. In order to allow customers and colleagues in the environmental protection industry to fully understand Lemag products, supporting electrodes and reagent products, as well as solutions for the environmental water quality industry were also exhibited at the same time, attracting a large number of professional customers to inquire and negotiate cooperation. About Shanghai INESA Shanghai INESA Scientific Instrument Co., Ltd. is a high-tech enterprise under Shanghai INESA Group specializing in scientific instrument research and development, production, sales, application, integration and service. Its own brand "Lei-ci" was founded in 1940 and has long focused on the fields of electrochemical instruments and water quality analysis. Its products are widely used in environmental protection, food and medicine, scientific research, and health. The company takes "to improve people's quality of life, provide high-tech products and services" as the market goal, adhering to the corporate tenet of "integrity, truth-seeking, innovation, refinement, cooperation, and far-reaching", and has gradually developed into the largest scientific instrument in China One of the professional companies and the leader in electrochemical analysis instruments.