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In-situ determining method for total SO2 in food

A SO2, food technology, applied in the direction of electrical excitation analysis, material excitation analysis, etc., can solve the problems of time-consuming, affecting calcium absorption, carbohydrate metabolism, organ toxicity and side effects, etc., and achieve low-cost effects

Active Publication Date: 2019-08-20
ANALYSIS & TESTING CENT CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A small amount of SO 2 After entering the body, sulfate is formed, and finally excreted by the urinary system after detoxification by the human body. It can be considered safe and harmless, but long-term consumption of SO 2 Food that exceeds the standard will produce symptoms such as nausea and vomiting, and have toxic and side effects on various organs. At the same time, it will also affect the absorption of calcium and the metabolism of protein and carbohydrates
[0004] The national standard method (GB 5009.34-2016) is a conventional chemical method, and the titration process has large human factors and takes a long time
Although the traditional pararosaniline hydrochloride spectrophotometry method has high sensitivity and reliable results, it uses highly toxic sodium tetrachloromercury, which is harmful to the environment and analysts, and the color development steps are cumbersome
Although gas chromatography, ion chromatography, and continuous flow analyzer are simple and sensitive, they are usually bulky, expensive, and not portable, which has certain limitations

Method used

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  • In-situ determining method for total SO2 in food

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Experimental program
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Embodiment 1

[0042] In this embodiment, direct gas sampling is adopted, and SO 2 Standard gas (99.999%, 0.1mL) is detected and analyzed, and its emission spectrum in the wavelength range of 175-400nm is detected to study the effect of DBD-MES on SO 2 detection capability. SO 2 Molecular emission lines see figure 1 , select signal 301.9nm for SO 2 characteristic wavelength.

Embodiment 2

[0044] In this embodiment, direct gas sampling is adopted, and the same volume (0.1mL) of different gases, including SO 2 、H 2 S(5%+N 2 ), N 2 , Ar and air were detected and analyzed at 301.9nm. See the experimental results figure 2 , SO 2 After injection into the system, the response intensity was significantly enhanced, while the H 2 S, N 2 , Ar, and air due to disturbance of the discharge gas, the response intensity is slightly improved, but the difference with the background spectrum is not significant, thus confirming that the present invention is effective for SO 2 The detection of is characteristic at 301.9 nm.

Embodiment 3

[0046] In this embodiment, direct gas sampling is adopted, and SO 2 Standard gas (0.1mL) was injected repeatedly, and its characteristic emission intensity at 301.9nm was detected to study the effect of this method on SO 2 Detection precision, 23 repeated injections RSD = 1.89%. See the experimental results image 3 , so it is determined that this method is effective for SO 2 Detection has good precision.

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Abstract

The invention relates to an in-situ determining method for total SO2 in food, and belongs to the field of analytical chemistry. Sulfite in food is converted into SO2 gas by online continuous acidifying, dielectric barrier discharge microplasma serves as a SO2 excitation device, a CCD emission spectrum detector records and analyzes data, and SO2 in the food is detected quantitatively in-situ by selecting 301.9nm as the characteristic emission spectral line. The total SO2 is determined on the basis of the dielectric barrier discharge-molecule emission spectrometry, the sulfite in the food is converted into SO2 without pre-treatment by online continuous acidifying via dilute H2SO4, separation of SO2 from a sample is facilitated by heating, the dielectric barrier discharge microplasma excitesSO2 molecules, quantitative analysis is made according to the peak area of the characteristic emission spectral line, thus, the total SO2 in food is detected quantitatively in-situ, and the method ischaracterized by being rapid, accurate, stable and low-cost.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and relates to a method for in-situ determination of total sulfur dioxide (SO 2 ) detection method, the method acidifies the sample online by dilute sulfuric acid, and heating assists to promote SO 2 Separated from the sample, SO was excited by a dielectric barrier discharge microplasma 2 The molecule produced a characteristic emission spectrum (301.9 nm), and data analysis was performed using a charge-coupled spectroscopic detector. Background technique [0002] According to "National Standard - Determination of Sulfur Dioxide in Food" (GB5009.34-2016), the standard method acidification-distillation-absorption-titration method determines the total SO2 in food 2 ;According to "National Standards - Standards for the Use of Food Additives" (GB2760-2014), SO 2 , potassium pyrosulfite, sodium pyrosulfite, sodium sulfite, sodium bisulfite and low sodium sulfite are all based on SO 2 residue met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/69
CPCG01N21/69
Inventor 韩丙军钱兵赵婧何燕彭黎旭汤建彪
Owner ANALYSIS & TESTING CENT CHINESE ACADEMY OF TROPICAL AGRI SCI