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Heavy metal trace detection method and application thereof

A detection method, heavy metal technology, applied in the direction of measuring devices, material analysis using wave/particle radiation, instruments, etc., can solve the problems of large acid consumption, large amount of production, and adverse health effects of testing personnel, so as to improve accuracy, The effect of eliminating loss and contamination, simple and efficient test method

Active Publication Date: 2022-06-24
INST OF QUALITY STANDARD & DETECTION TECH YUNNAN ACAD OF AGRI SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the following problems still exist: (1) a large amount of acid solution is consumed during pretreatment, and a large amount of acid mist is generated during the digestion process, which has certain pollution to the environment and has adverse effects on the health of testing personnel; (2) pretreatment digestion is Using high-grade nitric acid, perchloric acid, etc. to oxidize organic substances in the sample to produce inorganic ions, the whole process takes a long time, and the required economic and time costs are high

Method used

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  • Heavy metal trace detection method and application thereof
  • Heavy metal trace detection method and application thereof
  • Heavy metal trace detection method and application thereof

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Embodiment 1

[0058]Thirty tea samples were randomly selected for determination by ICPMS and X-ray fluorescence spectrometer, respectively, and the relative differences between the two independent determination results were calculated, which were As 0.34∽13.35%, Pb 0.70∽11.34%, Cd 0.73∽14.97%, Cr0. 61∽9.66%, Cu 0.15∽7.05%, Zn 0.38∽13.20%, Ni 0.28∽9.52%, all When the content is 1mg / kg, the relative difference is less than or equal to 10%; when the content is less than or equal to 1mg / kg and >0.1mg / kg, the relative difference is less than or equal to 15%; when the content is less than or equal to 0.1mg / kg, the relative difference is less than or equal to 20%). (See Tables 5.1 to 5.2 for details. Table 5 is divided into 5.1 and 5.2 due to layout problems).

[0059] Table 5.1 Determination of content (mg / kg) and relative difference (%) of tea samples

[0060]

[0061]

[0062] Table 5.2 Determination of content (mg / kg) and relative difference (%) of tea samples

[0063]

[0064] ...

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Abstract

The invention belongs to the technical field of trace detection, and discloses a heavy metal trace detection method and application thereof. The detection method disclosed by the invention specifically comprises the following steps: preparing a quality control sample; mixing the quality control sample and the to-be-detected sample according to a specific proportion; then carrying out trace detection on the heavy metals by adopting an X-ray fluorescence spectrometer, and realizing quantitative analysis on the heavy metals by utilizing the standard curve. When the method is used for detecting the heavy metal elements in the tea leaves, the detection time is shortened, the use of a large amount of acid liquor is avoided, the environmental protection performance is improved, the detection cost is reduced, the obtained standard curve is high in correlation degree, and the detection result is accurate.

Description

technical field [0001] The invention relates to the technical field of trace detection, in particular to a method for detecting trace amounts of heavy metals and applications thereof. Background technique [0002] After we eat food containing heavy metals, heavy metals will accumulate in the human body, which is very difficult to be degraded and eliminated from the body. Therefore, a very small amount of heavy metals will also cause harm to the human body due to the accumulation. Heavy metals can interact strongly with proteins, enzymes, etc. in the human body, making them inactive, and may also accumulate in some organs of the human body, causing chronic poisoning. [0003] However, the content of heavy metals in tea is often very low, and it is difficult to be detected directly by the instrument, so pre-treatment with acid digestion is often set. However, the conventional acid digestion process takes a long time, and the accuracy of the determination results is easily aff...

Claims

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Application Information

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IPC IPC(8): G01N23/223G01N23/2202
CPCG01N23/223G01N23/2202G01N33/14G01N2223/076G01N2223/60
Inventor 杜丽娟黎其万林涛叶艳萍魏茂琼毕亚楠
Owner INST OF QUALITY STANDARD & DETECTION TECH YUNNAN ACAD OF AGRI SCI