Detection method of lead content of food

A detection method and technology for lead content, applied in the field of detection of lead content in food, can solve the problems of low extraction efficiency of metal elements, hidden dangers of food use safety, low detection accuracy, etc., and achieve complete digestion, reliable data monitoring, and reduce interference. Effect

Active Publication Date: 2016-03-02
SHENZHEN KEYLAB TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current lead detection methods in my country have problems such as low extraction efficiency of metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Accurately weigh 1.000g of a chicken sample from a certain farm, weigh 1.000g of food samples into a microwave digestion tank, add 10ml of hydrochloric acid for the first digestion at 100°C for 10 minutes; cool for 10 minutes before adding 10ml nitric acid and 2ml hydrogen peroxide for the second digestion at 170°C for 5 minutes; for the third digestion at 240°C for 15 minutes, cool to room temperature after digestion, then take out the digestion solution and add 10ml deionized Evaporate 10ml of water at 100°C, then add 3ml of tartaric acid with a concentration of 50g / L as a matrix modifier, and finally add deionized water to adjust the volume to 25mL, and mix well to obtain the test solution.

[0020] (2) Prepare blank solution and standard solution: prepare blank solution and lead standard solutions of 5 μg / L, 10 μg / L, 20 μg / L, 30 μg / L, 40 μg / L, and 50 μg / L.

[0021] (3) Detection of lead content: measured by graphite furnace spectrophotometer, background calibrat...

Embodiment 2

[0023] (1) Precisely weigh 1.000g of a certain puffed food, weigh 1.000g of food sample into a microwave digestion tank, first add 10ml of hydrochloric acid for the first digestion at 110°C for 5 minutes; add 5ml of nitric acid and 2ml of hydrogen peroxide was digested for the second time at 160°C for 10 minutes; for the third digestion at 220°C for 10 minutes. Cool to room temperature after digestion, then take out the digestion solution and add 15ml of deionized water to evaporate 15ml of water at 110°C, finally cool to room temperature, add 2ml of tartaric acid with a concentration of 60g / L as a matrix modifier, and finally add deionized water to volume to 25mL, mix well to obtain the test solution.

[0024] (2) Prepare blank solution and standard solution: prepare blank solution and lead standard solutions of 5 μg / L, 10 μg / L, 20 μg / L, 30 μg / L, 40 μg / L, and 50 μg / L.

[0025] (3) Detection of lead content: measured by graphite furnace spectrophotometer, background calibrati...

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PUM

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Abstract

The invention discloses a detection method of lead content of food. The method comprises the following steps: (1) pretreating a sample; (2) preparing a blank solution and a standard solution; and (3) detecting lead content. By the detection method, food is completely degraded, acid consumption is low, and content of lead in food can be rapidly and accurately detected in batches.

Description

technical field [0001] The invention relates to the field of food safety, in particular to a detection method for 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 of widespread concern in all countries in 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 human health. [0003] 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 cumulative, long-term intake of fo...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N1/44
CPCG01N1/44G01N21/3103G01N21/33
Inventor 郝彦军
Owner SHENZHEN KEYLAB TECH CO LTD
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