Method for detecting contents of lead in foods

A detection method and technology for lead content, applied in the field of detection of lead content in food, can solve problems such as inability to accurately detect lead content, and achieve the effects of facilitating observation and collection, saving time, and preventing inaccurate test results.

Inactive Publication Date: 2019-09-13
中农康正技术服务有限公司
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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for detecting lead content in food, which has the advan

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Embodiment Construction

[0040]The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] A detection method for lead content in food, comprising the following steps:

[0042] S1: Reagent preparation:

[0043] S1.1: Nitric acid solution: Take 100ml of nitric acid and slowly add it to 100ml of water;

[0044] S1.2: Phenol red indicator solution: weigh 200mg of phenol red, add 200ml of ethanol to dissolve;

[0045] S1.3: Ammonia solution: mix 1 part of ammonia water with 1 part of water, if it contains lead, use a full glass still to redistill;

[0046] S1.4...

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Abstract

The invention relates to the technical field of food safety, and discloses a method for detecting contents of lead in foods. According to the method, nitric acid solution, ammonia solution, diammoniumhydrogen citrate solution, editpotassium cyanide solution, dithizone stock solution, lead standard solution, lead standard working solution and dithizone working solution are prepared to carry out adetection test; a spectrophotometer, a 125 ml separating funnel, a 250 ml flask or a 250 ml conical flask and an electronic balance are prepared to fit the detection work; after a sample is treated through a wet resolution method or a dry ashing method, the sample is measured; and finally, the contents of lead in various foods are obtained through a formula. The method for detecting the contents of leads in foods is capable of accurately calculating and detecting liquid foods through the wet resolution method, and visually inspecting the color changes in the foods after the organic matters inthe liquid foods are completely decomposed and subsequent heating is completed, so as to carry out treatment for the next step more rapidly and more timely during the detection and then prevent the measurement results from deviations.

Description

technical field [0001] The invention relates to the technical field of food safety, in particular to a method for detecting lead content in food. Background technique [0002] Food safety is an important issue that people generally pay attention to, and heavy metal pollution is one of the important issues of food safety. At present, the pollution of heavy metals has become a hot issue that is generally concerned by countries all over the world. With the advent of urbanization and industrialization, and the continuous accumulation of heavy metal pollutants, and through the transmission and amplification of the food chain, it will irreversibly have a major impact on the lives of urban and rural people, thus bringing great harm to the entire ecological environment and the health of the population. Heavy metals widely exist in food and food processing. Most heavy metals are harmful to the human body, and because heavy metals are very stable, difficult to degrade, and cumulativ...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31G01N1/44
CPCG01N1/44G01N21/31G01N21/78
Inventor 林琳戴春阳李陈娟
Owner 中农康正技术服务有限公司
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