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Analysis and detection method of chromium metal element in solid food samples

A metal element and detection method technology, which is applied in the preparation of test samples, material analysis, material analysis through optical means, etc., can solve problems such as complex composition, low content of heavy metal ions, damage, etc., to ensure health, safety, and environment Less pollution and improved operating environment

Active Publication Date: 2022-08-02
武汉海关技术中心
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  • Application Information

AI Technical Summary

Problems solved by technology

Trivalent chromium is considered to be an element beneficial to the human body, and it is an essential element for the body's glucose metabolism and lipid metabolism, but some studies have shown that excessive intake of trivalent chromium can damage the DNA in the human body
[0006] Due to the complex composition of food samples, especially solid food samples, the low content of heavy metal ions, and the diversity of valence and form of some heavy metal elements, the current detection and analysis methods for the content of heavy metal ions in food need to be further improved

Method used

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  • Analysis and detection method of chromium metal element in solid food samples
  • Analysis and detection method of chromium metal element in solid food samples
  • Analysis and detection method of chromium metal element in solid food samples

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1 Preparation of solution

[0039] Mixed standard stock solution: Pipette 2 mL of multi-element mixed standard solution (GBW08607: where the Cr concentration is 0.516 μg / g). Dissolve in 25 mL of deionized water, shake well, and obtain a mixed standard stock solution with a Cr concentration of 41.28 μg / L.

Embodiment 2

[0040] Example 2 Pretreatment of samples using ionic liquid and nitric acid

[0041] Accurately weigh 3g of ionic liquid [Bmim]-Cl into a beaker, heat the beaker to 90°C to melt the crystals of ionic liquid [Bmim]-Cl, remove and cool after complete melting, accurately weigh 0.2g of sample powder into the beaker , disperse the sample evenly on the liquid surface, add 0.5 mL of concentrated HNO 3 , heated to 160 °C, dissolved for 5 min, added deionized water to precipitate the cellulose, and set the volume to 50 mL. After the precipitated cellulose settled naturally, take part of the supernatant, and use graphite furnace atomic absorption spectrometry to detect it.

Embodiment 3

[0042] Example 3 Selection of ashing temperature

[0043] Since the aqueous solution of ionic liquid [Bmim]-Cl contains organic substances, it is difficult to completely ashing the organic substances when using a lower ashing temperature, which will interfere with the detection. When the ashing temperature is in the range of 1000℃~1400℃, the absorbance value of Cr element is measured in the appendix. figure 1 . It can be seen from the figure that when the Cr element is detected, when the ashing temperature is lower than 1300 °C, the ionic liquid [Bmim]-Cl has an inhibitory effect on the detection signal. When the ashing temperature reaches 1300 °C, the detection signal reaches the maximum value. The optimum ashing temperature was found to be 1300°C.

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Abstract

The present invention provides a method for analyzing and detecting chromium metal elements in a solid food sample, comprising: (1) dissolving the solid food sample by using a hydrophilic ionic liquid; (2) adding deionized water to precipitate cellulose, and filtering (3) Chromium content detection was carried out on the aqueous solution of hydrophilic ionic liquid by graphite furnace atomic absorption spectrometry. The method has the advantages of high sensitivity, strong universality and simple operation.

Description

technical field [0001] The invention belongs to the field of food safety, in particular, the invention relates to a method for analyzing and detecting chromium metal elements in solid food samples. Background technique [0002] Heavy metals, as a ubiquitous environmental pollutant, can cause great hidden dangers to food safety and are food pollutants that need to be strictly controlled. Therefore, it is very important to detect and analyze heavy metal ions in food solid samples. As a heavy metal, chromium will cause irreversible harm if it accumulates in the human body to a certain extent. Heavy metal elements are difficult to be degraded and excreted in the living body, and the heavy metals in the environment will be enriched thousands of times through the food chain into human daily life. in the required food. [0003] Chromium is widely used in modern industries. For example, in the automotive industry, chromium is used to make parts; for example, in the audio-visual ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N1/34G01N1/44G01N1/28G01N1/38
CPCG01N21/3103G01N1/34G01N1/44G01N1/28G01N1/38
Inventor 凌约涛郭少飞魏鑫潘瑞花王遥雪王帆
Owner 武汉海关技术中心
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