Analysis detection method for chromium metal element in solid food sample

A detection method and technology for metal elements, which are used in the preparation of test samples, analysis of materials, and material analysis by optical means, etc., can solve the problems of low heavy metal ion content, damage, complex composition, etc. The effect of eliminating interference, eliminating safety and environmental pollution problems

Active Publication Date: 2019-12-24
武汉海关技术中心
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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 detection method for chromium metal element in solid food sample
  • Analysis detection method for chromium metal element in solid food sample
  • Analysis detection method for chromium metal element in solid food sample

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Experimental program
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Embodiment 1

[0038] Embodiment 1 preparation solution

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

Embodiment 2

[0040] Example 2 Using ionic liquid and nitric acid to sample pretreatment

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

Embodiment 3

[0042] The selection of embodiment 3 ashing temperature

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

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Abstract

The invention provides an analysis detection method for a chromium metal element in a solid food sample. The analysis detection method comprises the steps of: (1) dissolving the solid food sample by adopting hydrophilic ionic liquid; (2) adding deionized water to enable cellulose to be precipitated out, and filtering; and (3) carrying out chromium content detection on aqueous solution of the hydrophilic ionic liquid by graphite furnace atomic absorption spectrometry. The method has the advantages of high sensitivity, high universality, simplicity and convenience for operation and the like.

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, will 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 to a certain extent in the human body. Heavy metal elements are difficult to degrade and excrete in the body, and heavy metals in the environment will be enriched thousands of times through the food chain to human daily life. in the required food. [0003] Chromium is widely used in modern industry. For example, in the automobile industry, chromium is used to make parts; for example, in the audio-visual industry, chromium is ...

Claims

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Application Information

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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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