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Quick detecting method for formaldehyde content in aquatic product

A formaldehyde content and detection method technology, which is applied in the direction of material analysis by observing the impact on chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of inconvenient operation and high cost of detection reagents, and achieve food safety. , cheap reagents, simple operation

Inactive Publication Date: 2013-07-24
SHAANXI UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a rapid detection method of formaldehyde content in aquatic products and a colorimetric card and reagent tube used in the method, so as to solve the problems of high detection reagent cost and inconvenient operation of the existing detection method of formaldehyde content

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  • Quick detecting method for formaldehyde content in aquatic product

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[0012] Example: Preparation of Schiff's reagent: Dissolve 0.2g fuchsin hydrochloride in 100mL hot distilled water, add 2g NaHSO after the solution is cooled 3 (AR), then slowly add 2mL of concentrated hydrochloric acid, the solution appears colorless or light yellow, dilute the solution to 200mL with double distilled water, and put it in a refrigerator at 4°C for later use.

[0013] Preparation of 100mg / kg formaldehyde standard solution: Accurately measure 1.0mL of 40% formaldehyde solution with a 2mL pipette into a 50mL volumetric flask, distill to volume with distilled water, and shake well. Then use a 10mL pipette to accurately measure 6.25mL of the solution into a 500mL volumetric flask, use twice distilled water to make up the volume, shake well, and put it in a 4°C refrigerator for later use.

[0014] Under the optimal reaction conditions, 5 mL of formaldehyde solutions of different concentrations were added to 8 stoppered colorimetric tubes to make the concentrations re...

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Abstract

The invention discloses a quick detecting method for formaldehyde content in an aquatic product. The quick detecting method comprises the following steps: (1) preparing a Schiff reagent; (2) making a standard color chart, namely respectively adding 5mL formaldehyde solutions with different concentrations to 8 different colorimetric tubes, respectively adding a 0.5mL Schiff reagent to the colorimetric tubes, adjusting the pH of the solutions to 2.5, shaking up the solutions, stewing and developing for 10 minutes, and making the color chart by taking colors displayed by the solutions as standard colors; and (3) detecting, namely extracting a 5mL soak solution of an aquatic product sample to be detected, adding a 0.5mL Schiff reagent to the soak solution, adjusting the pH of the solution to 2.5, shaking up the solution, stewing and developing for 10 minutes, and comparing the color displayed by the solution with standard colorimetric splines. The quick detecting method disclosed by the invention has the characteristic that the formaldehyde and the Schiff reagent react at a normal state to generate a purple-red compound, and the shade of the compound is in direct proportion to formaldehyde content so as to realize colorimetric assay. The quick detecting method has the advantages of simple and quick operation, high sensitivity, simple conditions, low reagent price, and the like.

Description

technical field [0001] The invention relates to a detection method for aquatic products, in particular to a method for rapidly detecting formaldehyde content in aquatic products. Background technique [0002] Formaldehyde is the simplest carbonyl compound. It is a colorless gas with a special pungent odor under normal conditions. As a lower aldehyde, it can be miscible with water. Its 35% to 40% aqueous solution is commonly called formalin. Formaldehyde is a toxic substance. According to its toxicity classification, formaldehyde is a moderately toxic substance. If a person accidentally swallows 1020 μL of formaldehyde solution at one time, it can cause death. The acceptable daily intake recommended by the U.S. Environmental Protection Agency should not exceed 0.2 mg / ton body weight / day. Acute formaldehyde poisoning through the mouth can directly damage people's mouth, throat, esophagus and gastric mucosa, and produce poisoning reactions at the same time. In mild cases, dizz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 吴迎春聂峰葛红光田光辉赖普辉
Owner SHAANXI UNIV OF TECH
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