Sulfur dioxide rapid test kit and its use

Abstract

Without need of additional instrument, the kit is capable of mensurating range of sulfur dioxide contained in article rapidly; and minimum limit of detection is 6.0mg / Kg. The disclosed kit includes reactor with zinc powder, reactor plug with slit, 7-8m test paper of hydrochloric acid and lead acetate, the standard color grade in brown series, and thin plastic plant. The method includes steps: adding the soak of specimen to be tested into reactor with 0.5-2.0g zinc powder being loaded; adding hydrochloric acid, placing cover, overhanging wetted test paper of lead acetate inside the reactor; after 3 min, comparison is carried out between color of the test paper and standard color grade; determining content range of sulfur dioxide. Features are: simple operation, quick and sensitive, and widely available to test in site.

Description

technical field [0001] The invention belongs to a test kit for detection, and relates to a method and a device for quickly measuring the content of sulfur dioxide in food. Background technique [0002] In recent years, driven by money and interests, some unscrupulous traders have used various chemical methods to "beautify" their products and deceive consumers. One of the more common cases is to fumigate food with sulfur. [0003] Sulfur is a yellow or light yellow granule (powder) or flake, flammable. Sulfur is insoluble in water, slightly soluble in ethanol and ether, soluble in carbon disulfide, carbon tetrachloride and benzene. It has insecticidal, acaricidal and bactericidal effects. [0004] Because sulfur will combine with oxygen during the fumigation process to produce sulfur dioxide, and sulfur dioxide has a bleaching effect, so illegal traders mainly use sulfur fumigation to bleach or whiten food; at the same time, sulfur has a bactericidal effect, so it can be us...

AI Technical Summary

Problems solved by technology

[0007] At present, sodium tetrachloromercury-pararosaniline colorimetric method is widely used in China to determine SO in food. 2 [GB / T 5009.34-1996], but the determination process needs to use highly toxic high mercury chloride and the operation steps are complicated, and equipment is required. In addition, there are literature reports, and the oscillographic polarographic method can be used to determine the residual amount in food. Sulfur dioxide, but this method also requires instruments, which is not conducive to popularization and on-site determination

Some rapid sulfur dioxide determination methods have long detection time and low sensitivity, such as: ginger, white fungus, longan, lychee, lotus seeds, shrimp, bean sprouts, etc. will be missed

In short, there is no rapid detection kit for the detection of sulfur dioxide in food with a detection limit of 6.0 mg / Kg that is suitable for on-site detection requirements.

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