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An Improved Analytical Method for Hexavalent Chromium Species in Soil

An analysis method, the technology of hexavalent chromium, applied in the direction of soil material testing, preparation of test samples, material inspection products, etc., can solve the problem of inaccurate measurement of hexavalent chromium form distribution, achieve accurate form distribution and ensure accuracy Effect

Active Publication Date: 2021-07-13
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 4OAc was added to deionized water with HNO 3 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 2 g of mixed soil and place it in a container, continue to add 500 mL of solution A, vibrate at room temperature for 18 h within 30 min, filter with a 0.45 μm filter membrane, and After repeated 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 le...

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 2 g of mixed soil and place it in a container, continue to add 800 mL of solution A, vibrate at room temperature for 12 h within 30 min, filter with a 0.45 μm filter membrane, and After repeated 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 2g of mixed soil and...

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 2 g of mixed soil and place it in a container, continue to add 200 mL of solution A, vibrate at room temperature for 20 h within 30 min, filter with a 0.45 μm filter membrane, and After repeated 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 2 g of mixed soil an...

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Abstract

The present invention relates to an improved analysis method for the form of hexavalent chromium in soil. The soil to be analyzed is extracted and digested through different actual conditions, and the total content of hexavalent chromium in the soil to be analyzed is determined by alkaline digestion method. The content of the weak acid extraction state, the total content of the oxidizable state and the residue state, and the content of the residue state are calculated to obtain the contents of different forms of hexavalent chromium in the soil to be analyzed. The invention solves the problem of inaccurate measurement of hexavalent chromium form distribution in the existing method, ensures the accuracy of the analysis results of hexavalent chromium form in soil, and provides a theoretical basis for the selection of remediation technology for chromium-contaminated soil remediation projects. It does not need to use large instruments such as flame atomic absorption, nor does it need to carry out dangerous operations such as complete digestion, and it is easier to carry out analysis work.

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 Patents(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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