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GB5009.34-2022 "Determination of sulfur dioxide in food"; 2015 and 2020 editions of "Chinese Pharmacopoeia" detect sulfur dioxide residues in Chinese medicinal materials and decoction pieces

GB5009.34 and the 2015 edition of "Chinese Pharmacopoeia" stipulate three detection methods for sulfur dioxide: acid-base titration, spectrophotometry (food)/gas chromatography (traditional Chinese medicine), ion chromatography, etc. Spectroscopic/gas phase and ion chromatography have the advantages of high sensitivity and strong specificity, but the equipment is expensive, which is not conducive to the popularization and use of grass-roots food and drug inspection systems;

The acid-base titration method has the advantages of simple device and low cost, and is the legal detection method stipulated by the national food standard and pharmacopoeia. However, since they are all glass instrument devices that only describe the method, the purchase, assembly and implementation of the entire set of devices still need to be continuously improved. For example: (1) In addition to the glass instrument device, magnetic stirring, electric heating mantle, titration platform, nitrogen device with flow meter, etc. should be equipped and assembled. Many units feel that the purchase of equipment is cumbersome and difficult to assemble and implement, so they cannot carry out this detection method; (2) The assembled devices are varied, and there are unstable nitrogen flow rates, uneven heating, easy gas leakage, and easy bumping during use. , easily affected by the cooling water source, etc., which lead to the phenomenon of poor parallelism and low recovery rate that directly affect the test results; (3) The work efficiency is low, the current equipment adopts a single device, which is difficult to process multiple samples at the same time. The simultaneous testing of secondary medicinal materials is time-consuming and labor-intensive.