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Improved analysis method of hexavalent chromium form in soil

An analysis method and hexavalent chromium technology, which are applied in soil material testing, preparation of test samples, material inspection products, etc., can solve problems such as inaccurate measurement of hexavalent chromium form distribution, achieve easy analysis work, and ensure accuracy , the effect of accurate morphological distribution

Active Publication Date: 2019-10-15
招商局生态环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a kind of analytical method of hexavalent chromium form in the improved soil, solve the inaccurate problem of hexavalent chromium form distribution in the existing method, guarantee the accuracy of hexavalent chromium form analysis result in soil Accuracy, providing a theoretical basis for the selection of remediation technology for chromium-contaminated soil remediation projects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) The soil to be analyzed is uniformly mixed and then used;

[0041] (2) Ready-to-use solution: 0.11mol / L glacial acetic acid aqueous solution as solution A, 0.5mol / L NH 2 OH·HCl aqueous solution as solution B, 8.8mol / L H 2 o 2 Aqueous solution as solution C, 1.0mol / L NH 4 OAc aqueous solution as solution D (NH 4 OAc was added to deionized water with HNO3 The pH of the solution was adjusted to 2.0, and finally the volume was constant with deionized water to obtain NH with a molar volume concentration of 1.0mol / L. 4 OAc aqueous solution is solution D);

[0042] (3) Preparation of soil leached by solution A: Weigh 2g of mixed soil and put it in a container, continue to add 500mL of solution A, shake at room temperature for 18h within 30min, filter with 0.45um filter membrane, and repeat with water After cleaning, take it out and dry it to obtain the soil leached by solution A;

[0043] (4) Preparation of soil leached by solution B: Weigh 2g of mixed soil and extra...

Embodiment 2

[0059] (1) Get the soil mixed homogeneously in Example 1 for stand-by;

[0060] (2) Ready-to-use solution: 0.11mol / L glacial acetic acid aqueous solution as solution A, 0.5mol / L NH 2 OH·HCl aqueous solution as solution B, 8.8mol / L H 2 o 2 Aqueous solution as solution C, 1.0mol / L NH 4 OAc aqueous solution as solution D (NH 4 OAc was added to deionized water with HNO 3 The pH of the solution was adjusted to 2.1, and finally the volume was constant with deionized water to obtain NH with a molar volume concentration of 1.0mol / L. 4 OAc aqueous solution is solution D);

[0061] (3) Preparation of soil leached by solution A: Weigh 2g of mixed soil and put it in a container, continue to add 800mL of solution A, shake at room temperature for 12h within 30min, filter with a 0.45um filter membrane, and repeat with water After cleaning, take it out and dry it to obtain the soil leached by solution A;

[0062] (4) Preparation of soil leached by solution B: Weigh 2 g of mixed soil an...

Embodiment 3

[0074] (1) Get the soil mixed homogeneously in Example 1 for stand-by;

[0075] (2) Ready-to-use solution: 0.11mol / L glacial acetic acid aqueous solution as solution A, 0.5mol / L NH 2 OH·HCl aqueous solution as solution B, 8.8mol / L H 2 o 2 Aqueous solution as solution C, 1.0mol / L NH 4 OAc aqueous solution as solution D (NH 4 OAc was added to deionized water with HNO 3 The pH of the solution was adjusted to 1.9, and finally the volume was constant with deionized water to obtain NH with a molar volume concentration of 1.0mol / L. 4 OAc aqueous solution is solution D);

[0076] (3) Preparation of soil leached by solution A: Weigh 2g of mixed soil and put it in a container, continue to add 200mL of solution A, shake at room temperature for 20h within 30min, filter with 0.45um filter membrane, and repeat with water After cleaning, take it out and dry it to obtain the soil leached by solution A;

[0077] (4) Preparation of soil leached by solution B: Weigh 2g of mixed soil and l...

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Abstract

The invention relates to an improved analysis method of a hexavalent chromium form in soil. The method is characterized by extracting and digesting soil to be analyzed through different realities; measuring and acquiring a total content of hexavalent chromium, the content of a non-weak acid extraction state, the total contents of an oxidable state and a residual state, and the content of the residual state in the soil to be analyzed through an alkali digestion method; and acquiring the contents of different forms of hexavalent chromium in the soil to be analyzed through calculation. In the invention, a problem that hexavalent chromium form distribution measurement is not accurate in an existing method can be solved; accuracy of a hexavalent chromium form analysis result in the soil is ensured, and a theoretical basis is provided for restoration technology selection of chromium pollution soil restoration engineering; and simultaneously, large instruments such as flame atomic absorptionand the like are not required during an analysis process, dangerous operations such as full digestion and the like are not required, and analytical work can be easily developed.

Description

technical field [0001] The invention belongs to the field of soil heavy metal form analysis, and in particular relates to an improved analysis method for hexavalent chromium form in soil. Background technique [0002] The speciation analysis of heavy metals in soil usually uses Tessier or BCR method, and the experimental results are very good. The Tessier method was proposed by scholars in 1984. After years of testing by scholars from various countries, it has been shown that it has high applicability for the speciation analysis of heavy metals other than hexavalent chromium. At the same time, the European Community proposed the BCR method in order to unify the Tessier method. Its essence is consistent with the principle of Tessier's method, but only unifies the operation. [0003] The BCR method divides the soil form into four parts: weak acid extraction state, reducible state, oxidizable state and residue state. Into different extracts, and then analyze the heavy metal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N1/44
CPCG01N1/44G01N33/24
Inventor 秦仕强王东辉李广辉崔涛陶伟光龚时慧
Owner 招商局生态环保科技有限公司
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