Preparation method of sodium nitrite standard sample for food safety rapid detecting box

Abstract

The invention discloses a preparation method of a sodium nitrite standard sample for a food safety rapid detecting box. The method comprises the following steps: (1) drying sodium chloride, keeping the weight constant; (2) drying sodium nitrite, keeping the weight constant; (3) mixing sodium chloride and sodium nitrite, grinding uniformly; and (4) subpackaging with a white capsule to obtain a sodium nitrite standard sample. The sodium nitrite standard sample is a solid sample; when in use, a defined amount of distilled water is used to dissolve the solid standard sample, thus the standard sample is easy and convenient to use; the inspector performs all the operations of the calibration sample and samples and the four factors, namely control temperature, pH value, dosage of color reagent and reaction time can be consistent, thus the detection error of the traditional method can be avoided; the solid calibration sample is filled in a tube, thus the cost is low and the sample is convenient to carry and easy to store and can not be volatilized; and the solid calibration sample is used for color comparison, thus the inspector can intuitively judge whether a detected sample exceeds a standard or not without checking the standard. The method is suitable for the common food safety rapid detecting box.

Description

technical field [0001] The present invention is related to the detection of objects by optical means, and more specifically, to the detection of food. Background technique [0002] Since 2004, my country has widely promoted food safety rapid inspection technology. Through rapid inspection of products, inspectors can conduct real-time inspections of food safety such as grain, vegetables, fruits, meat, and aquatic products in communities, supermarkets, farmers markets, restaurants, etc. Monitoring and spot checks at any time. Using the rapid detection technology, it can be detected whether there is Sudan red in chili sauce in 10 minutes, and whether steamed buns contain carcinogenic substances such as white block, formaldehyde, sulfur dioxide and other prohibited chemical components in 13 minutes. In addition, vegetable pesticide residues, pickled The nitrite content of food can also be quickly detected. [0003] The currently used food safety rapid detection box uses a color...

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