Laboratory sulfur dioxide distiller for residual detection of traditional Chinese medicine and food

Laboratory sulfur dioxide distiller for residual detection of traditional Chinese medicine and food

Product Introduction

Sulfur dioxide, as a food additive used in food processing, has anti-corrosion and bleaching effects. Sulfur dioxide is used reasonably according to fixed standards and will not cause harm to human health. However, if it is used for a long timeConstitutional quantityExposure to sulfur dioxide may pose a threat to human health. Nowadays, some illegal vendors add a large amount of sulfur dioxide to food for their own interests, resulting in serious exceedance of sulfur dioxide in food and posing a safety hazard to human health. The food sulfur dioxide detector detects the sulfur dioxide content in food to prevent it from entering the market. Excessive sulfur dioxide content in food may ultimately endanger human health and safety.
In the process of food processing and production, in order to maintain the original color of food, sulfur dioxide is commonly used as a food additive added to the food processing process. By relying on its oxidation-reduction reaction, the food fades or avoids browning. However, the corrosive effect of sulfur dioxide and excessive addition may have an impact on human health, so food sulfur dioxide detectors are often used to limit the content of sulfur dioxide in food.
The food sulfur dioxide detector is mainly composed of a microprocessor, a colorimetric cell, a photoelectric sensor, a liquid crystal display screen, etc. The detection results are directly displayed on the screen, making it convenient for people to intuitively understand the sulfur dioxide content in the tested sample.

Main parameters

1. Faster operating speed and stronger stability.
2. Display mode: 7-inch LCD touch screen display, user-friendly Chinese operation interface, intuitive and simple reading.
3. DC 12V power supply, can be equipped with a 6-hour high-capacity rechargeable lithium battery.
4. Automatic adjustment and calibration of light source brightness.
5. Intelligent constant current and voltage regulation, automatic calibration of light intensity, and long-term continuous operation of the light source without temperature drift phenomenon.
6. Built in new constitutionAccurate QuantityCompare on-site with the measured results and continuously update the standards.
7. Sample numbers are automatically accumulated.
8. The testing items can be expanded.
9. The test results can be printed and uploaded in batches.
10. The test results are in an Excel spreadsheet, which can be copied by connecting to a computer.
11. Supports USB storage, standard USB interface, and driver free installation.
12. Configurable large capacity lithium battery, firmware upgradable
In order to ensure human health and safety, the sulfur dioxide content in food is detected. The food sulfur dioxide detector is small in size and easy to carry. Suitable for quantitative determination of sulfur dioxide in on-site gas samples, liquid samples, and solid samples.

Laboratory sulfur dioxide distiller for residual detection of traditional Chinese medicine and food

Detection and analysis methods

Sulfur dioxide in the atmosphere is an important indicator for evaluating atmospheric environmental quality. Mainly derived from the oxidation of sulfur-containing elements during the combustion of sulfur-containing mineral fuels. Due to the widespread use of mineral fuels, sulfur dioxide is the main atmospheric pollutant.

The sulfur dioxide detector is suitable for corrosion testing of sulfur dioxide and hydrogen sulfide gases. The sulfur dioxide detector has the following functions: it can monitor the temperature, static pressure, volume concentration, and mass concentration of sulfur dioxide in the flue in real time; Long term storage of test data and the ability to query test data at any time; Large screen LCD real-time display, with a fully Chinese interface and standard keyboard operation, providing a user-friendly human-machine dialogue interface; Portable design, can communicate with PC through RS232 serial port, and has calendar/clock and printing functions; If conditions permit, the serial communication function between the microcontroller and the PC can be utilized on site to directly send the data sampled by the microcontroller from A/D to the PC through the serial port, and then the PC can store, analyze, and process the data.

The sulfur dioxide detector adopts appropriate monitoring and analysis methods to monitor and determine the process of sulfur dioxide content in the atmosphere. The time dual path sulfur dioxide fluorescence detection method theoretically eliminates the measurement error of sulfur dioxide caused by changes in gas composition. Through experimental analysis, this method is significantly superior to single path detection methods, resulting in significant improvements in selectivity, sensitivity, and anti-interference ability.

ButGong ZhiThe more mature monitoring method for sulfur dioxide is the hydrochloric acid para rosaniline method, which is recognized as the standard method for determining sulfur dioxide in China and other countries. When measuring, use a porous glass absorption tube containing potassium tetragreen mercury solution to collect the sulfur dioxide detector in the atmosphere. During the sampling process, sulfur dioxide reacts with the absorbent to form a complex. When formaldehyde and hydrochloric acid para rosaniline are added to the sampled absorption solution, a purple red compound is generated. This compound has a strong absorption effect on visible light at 548nm. Within an appropriate concentration range, the absorbance is linearly related to the concentration of sulfur dioxide. Therefore, by measuring the absorbance of the standard solution and sample solution, the content of sulfur dioxide in the atmosphere can be determined. This method has high sensitivity, strong anti-interference ability, and is relatively stable after sample collection. The disadvantage is that the mercury potassium solution used for greening is highly toxic.

However, in the determination method of sulfur dioxide detector, the better one is the ultraviolet fluorescence method. It uses ultraviolet light ranging from 190nm to 230nm to excite sulfur dioxide molecules, which can emit fluorescence. The fluorescence intensity is proportional to the concentration of sulfur dioxide. The sulfur dioxide analyzer made based on this principle was used abroad in 1976. This method has high sensitivity, strong selectivity, and easy operation, and is suitable for continuous automatic determination of sulfur dioxide in the atmosphere.