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Fast decomposition method for heavy metal soil samples

A technology for soil samples and heavy metals, which is applied in the preparation of test samples, etc., can solve the problems of shortening digestion time, difficult to control, and less digestion tanks, and achieves the effect of reducing the time required for digestion, saving costs and preferential prices.

Inactive Publication Date: 2019-12-27
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Electric hot plate heating digestion method: the equipment is simple and the cost is low, but it takes a long time and the operation is cumbersome, and the large amount of acid mist produced will bring harm to the operator. If the manual operation is not proper, it will easily cause the loss of components, especially the Cr element is not easy to control
[0005] Microwave digestion method: the determination of samples has high accuracy, good precision, small acid consumption, and is more convenient to operate, which can greatly shorten the digestion time. The disadvantage is that it is still heated on the electric heating plate to drive out the acid, and there are few digestion tanks. Not suitable for large batch sample analysis

Method used

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  • Fast decomposition method for heavy metal soil samples
  • Fast decomposition method for heavy metal soil samples
  • Fast decomposition method for heavy metal soil samples

Examples

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Embodiment 1

[0030] The acid anhydride in this example is prepared by mixing the following raw materials in proportions by weight: 3 parts of hydrochloric acid, 1 part of nitric acid, 1 part of hydrofluoric acid, and 1 part of perchloric acid. Hydrochloric acid is the superior grade of Sinopharm, with a concentration ≥ 65%; nitric acid is analytically pure, and its concentration is ≥ 65%; hydrofluoric acid is superior grade GR, and its concentration is ≥ 40%; 70%. Heavy metal soil samples are soil standard substances containing arsenic, cadmium, zinc, lead, and copper, specifically GBW07407 GSS-7 red soil, and the detection lines of the standard soil samples are 3.5-6.1 μg / L for arsenic and 0.06-0.1 μg / L for cadmium , Zinc 131~153mg / L, Lead 11~17mg / L, Copper 91~103mg / L.

[0031] The operation steps of this embodiment are as follows:

[0032] (1) First add 3 parts of Sinopharm superior grade pure GR hydrochloric acid;

[0033] (2) Next, add 1 part of analytically pure nitric acid, stir w...

Embodiment 2-7

[0040] The difference from Example 1 is that the raw material parts by weight of the acid anhydride are different, the heating and digestion time is different, as shown in Table 1, and all the other rapid digestion method operating steps are the same as in Example 1.

[0041] Each component amount and digestion time of acid anhydride in each embodiment of table 1

[0042]

[0043] The results of the heavy metal soil sample rapid digestion method in Example 1-Example 7 using ICP are shown in Table 2.

[0044] Table 2 implements the detection result of five kinds of heavy metals in 1-embodiment 7

[0045]

[0046]

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Abstract

The invention discloses a fast decomposition method for heavy metal soil samples. According to the fast decomposition method, anhydrides are prepared by even mixing in different anhydride proportions;and the anhydrides are prepared from the components in parts by weight: 3 parts of hydrochloric acid, 1 part of nitric acid, 1-2 parts of hydrofluoric acid and 1-2 parts of perchloric acid. In use, the four kinds of acids are mixed and stirred evenly with different volume ratios, and then the prepared anhydrides are added in the decomposition process. A chemical agent used in the method mainly adopts an analytical reagent, the low cost is achieved, the problem of expensive acid is solved, and by adopting the anhydrides, the effects of shortening the decomposition time and improving the decomposition efficiency are achieved advantageously in the decomposition process.

Description

technical field [0001] The invention relates to the technical field of sample pretreatment, in particular to a rapid digestion method for heavy metal soil samples. Background technique [0002] The determination of heavy metals in soil is mainly divided into two parts: pretreatment digestion and quantitative determination. The pretreatment of samples is the key, and different digestion methods will affect the accuracy of the determination results. At present, the pretreatment digestion method adopted by the national standard method is the electric heating plate digestion method, but this method takes a long time to digest, consumes a lot of acid, has a high blank value, and a large amount of acid volatilizes during the digestion process, which seriously pollutes the environment. [0003] In recent years, the fully automatic graphite digestion method has gradually replaced the electric heating plate digestion method. Both automatic graphite digestion method and electric heat...

Claims

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Application Information

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IPC IPC(8): G01N1/44
CPCG01N1/44
Inventor 杨崎峰朱红祥宋海农周永信廖长君张德明曹斐姝韦湘贵戴书剑廖谨宣韦军张子学
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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