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Preparation method of sulfur dioxide standard sample used for food safety rapid detection box

A technology for sulfur dioxide and food safety, which is applied in the preparation of test samples, material analysis by observing the impact on chemical indicators, and analysis by making materials undergo chemical reactions. Large detection errors and other problems, to achieve the effect of easy storage and avoid detection errors

Inactive Publication Date: 2014-04-16
贵州省理化测试分析研究中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently used food safety rapid detection box uses a colorimetric card for standard calibration. The detection of formaldehyde, sulfur dioxide, and nitrite in the rapid detection box is a colorimetric reaction. All colorimetric reactions must follow the temperature, pH, and the amount of color developer. The four elements of reaction time and reaction time, in which the reaction temperature, the amount of developer and the reaction time are related to the operator; while the color comparison card is a standard color comparison card, the operator cannot control it, which will cause a large detection error
[0004] After retrieval, in the Chinese patent database, applications involving food safety testing equipment include No. 03240360.7 "Multifunctional Food Toxic Chemical Contaminant Residue Detector", No. 200410013417.8 "Multi-channel Handheld Food Safety Detector", No. Safety Multi-item Rapid Detector", No. 200720112697.7 "A Quick Detector for Food Safety" and No. 200910079872.0 "A Multifunctional Expanded Food Safety Rapid Detector", etc. These patented technologies still use traditional color cards, and there is no Use operator-controlled detection methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 Preparation of a standard sample of sulfur dioxide: first, dry sodium chloride with a purity of ≥99.5% and keep the weight constant, then dry sodium sulfite or sodium bisulfite with a purity of ≥99.9%, and keep the weight constant; then take 100.0 g of sodium chloride and 0.163g sodium bisulfite or 0.200g sodium sulfite is mixed and ground evenly, the fineness is less than or equal to 400 mesh, and the content is 1000mg / kg; it is divided into white capsules, each 0.100g, to obtain a standard sample of sulfur dioxide.

Embodiment 2

[0017] Example 2 Take 0.5 g of Tremella sample (calculated according to the limit standard) and dissolve it in 10 mL of water, shake it sufficiently and then stand still for testing. Take out the sulfur dioxide calibration sample centrifuge tube, open it, and put it into a dry, clean small beaker; add 10 mL of distilled water to the small beaker to dissolve and shake well. Add 1 mL of the calibration solution and sample supernatant to the test tube, cover the lid, shake the reagents, add 2 drops of sulfur dioxide rapid detection reagent A and shake well, then add 2 drops of sulfur dioxide rapid detection reagent B and shake well. After 5 minutes, the color of the sample is compared with the calibration sample. If the color of the sample is lighter than that of the calibration sample, the sample is qualified; if the color of the sample is darker than that of the calibration sample, the sample needs to be further tested and confirmed.

Embodiment 3

[0018] Example 3 Take 0.5 g of a yuba sample (calculated according to the limit standard), dissolve it in 10 mL, fully shake with water, stand still, and wait for testing. Take out the sulfur dioxide calibration sample centrifuge tube, open it, and put it into a dry, clean small beaker; add 10 mL of distilled water to the small beaker to dissolve and shake well. Add 1 mL of the calibration solution and sample supernatant to the test tube, cover the lid, shake the reagents, add 2 drops of sulfur dioxide rapid detection reagent A and shake well, then add 2 drops of sulfur dioxide rapid detection reagent B and shake well. After 5 minutes, the color of the sample is compared with the calibration sample. If the color of the sample is lighter than that of the calibration sample, the sample is qualified; if the color of the sample is darker than that of the calibration sample, the sample needs to be further tested and confirmed.

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PUM

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Abstract

The invention discloses a preparation method of sulfur dioxide standard sample used for food safety rapid detection box. The method includes: (1) drying sodium chloride to constant weight; (2) drying sodium hydrosulphite or sodium bisulfite to constant weight; (3) mixing sodium chloride with sodium hydrosulphite, or sodium bisulfite or rongalite, and grinding uniformly; (4) packaging independently by white capsules to obtain sulfur dioxide standard sample. The sulfur dioxide standard sample in the invention is solid powder, which just needs to be dissolved by proper amount of distilled water in using, and thus the use is convenient and simple; the standard sample and test sample are operated by the detecting personnel, who control the consistency of four elements: temperature, pH, developer amount and reaction time, and can avoid detection errors in traditional method; the solid standard samples are packaged in tubes, which is low in cost, convenient to carry, hard to volatilize, and easy for preservation; when the solid standard sample is used for colorimetric test, detecting personnel need not to check the standard, and are able to visually detect whether the sulfur dioxide in the test sample exceeds the standard. The invention is suitable for common food safety rapid detection box.

Description

technical field [0001] The present invention is related to the detection of articles by optical means, and furthermore, it is related to the detection of food. Background technique [0002] Since 2004, my country has widely promoted food safety rapid detection technology. Through rapid detection of products, inspectors can conduct real-time inspections on the safety of food, vegetables, fruits, meat, aquatic products and other foods in communities, supermarkets, farmers markets, restaurants and other places. Monitoring and random inspection at any time. Using rapid detection technology, it takes 10 minutes to detect whether the chili sauce contains Sudan red, and 13 minutes to find out whether the steamed bread contains carcinogens, formaldehyde, sulfur dioxide and other prohibited chemicals. The nitrite content of food can also be quickly detected. [0003] The food safety rapid detection box currently in use is calibrated with a colorimetric card. The detection of formald...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78G01N1/28
Inventor 谢锋谭红陆洋舒海霞杨鸿波张清海李荣华宋光林罗艳何锦林周慧文锡梅
Owner 贵州省理化测试分析研究中心