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Method for detecting hexavalent chromium in soil

A detection method and hexavalent chromium ion technology, applied in the field of hexavalent chromium detection, can solve the problems of inaccurate analysis and detection results, interference with the accuracy of engineering acceptance, and achieve the effects of reducing interference, fast and accurate detection of hexavalent chromium concentration

Active Publication Date: 2020-04-28
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the excess reducing agent in the alkaline digestion process of soil pretreatment will react with the hexavalent chromium released in the soil lattice, resulting in inaccurate subsequent analysis and detection results
Various current testing methods are difficult to apply to such samples, and the accuracy of engineering acceptance involving such sites is also disturbed

Method used

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  • Method for detecting hexavalent chromium in soil
  • Method for detecting hexavalent chromium in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A detection method for hexavalent chromium ions, comprising the following steps:

[0031] (1) Take 2.5g of the soil sample reduced by ferrous sulfate, put it in a 4cm*6cm porcelain boat, and spread the soil evenly;

[0032] (2) The sample is placed in a tube furnace, and air is introduced at a flow rate of 6L / min;

[0033] (3) heating up to 100°C at a heating rate of 10°C / min, and keeping it warm for 72 hours to obtain pretreated soil;

[0034] (4) Add 0.4g of MgCl to the pretreated soil 2 , 0.5ml potassium dihydrogen phosphate buffer solution, add 50ml pH 12 by NaOH and Na 2 CO 3 The mixed alkali solution formed is subjected to alkali digestion and dissolution, heated at 95°C for 60 minutes, and solid-liquid separation;

[0035] (5) Add sulfuric acid solution after the liquid phase obtained by solid-liquid separation to constant volume, adjust the pH value to 2, add the acetone solution of diphenylcarbazide, develop color, constant volume, and measure the absorbanc...

Embodiment 2

[0037] A detection method for hexavalent chromium ions, comprising the following steps:

[0038] (1) Take 2.5g of soil samples reduced by calcium polysulfide, put them in a 4cm*6cm porcelain boat, and spread the soil evenly;

[0039] (2) The sample is placed in a tube furnace, and air is introduced at a flow rate of 6L / min;

[0040] (3) heating up to 100°C at a heating rate of 10°C / min, and keeping it warm for 72 hours to obtain pretreated soil;

[0041] (4) Put the pretreated soil in 200ml, add 0.4g of MgCl 2 , 0.5ml potassium dihydrogen phosphate buffer solution, add 50ml pH 12 by NaOH and Na 2 CO 3 The mixed alkali solution formed is subjected to alkali digestion and dissolution, heated at 90°C for 60 minutes, and solid-liquid separation;

[0042] (5) Add sulfuric acid solution after the liquid phase obtained by solid-liquid separation to constant volume, adjust the pH value to 2, add the acetone solution of diphenylcarbazide, develop color, constant volume, and measure...

Embodiment 3

[0044] A detection method for hexavalent chromium ions, comprising the following steps:

[0045] (1) Take 2.5g of the soil sample reduced by sodium sulfide, put it in a 4cm*6cm porcelain boat, and spread the soil evenly;

[0046] (2) The sample is placed in a tube furnace, and air is introduced at a flow rate of 6L / min;

[0047] (3) heating up to 100°C at a heating rate of 10°C / min, and keeping it warm for 72 hours to obtain pretreated soil;

[0048] (4) Put the pretreated soil in 200ml, add 0.4g of MgCl 2 , 0.5ml potassium dihydrogen phosphate buffer solution, add 50ml pH 12 by NaOH and Na 2 CO 3The mixed alkali solution formed is subjected to alkali digestion and dissolution, heated at 90°C for 60 minutes, and solid-liquid separation;

[0049] (5) Add sulfuric acid solution after the liquid phase obtained by solid-liquid separation to constant volume, adjust the pH value to 2, add the acetone solution of diphenylcarbazide, develop color, constant volume, and measure the ...

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Abstract

The invention, which belongs to the technical field of hexavalent chromium detection methods, particularly relates to a method for detecting the content of hexavalent chromium in soil. The method canbe used for detecting hexavalent chromium in a soil sample containing a large number of reducing agents after ventilation, heating and other pretreatment. Ferric oxide and sulfur reducing agents are used in the method, trivalent chromium is not oxidized, and the oxidation environment can be kept under a certain air flow to inhibit the reduction reaction. Therefore, the interference of a reducing agent on an alkali digestion result is reduced and the digested hexavalent chromium is protected to the greatest extent, so that the concentration of the hexavalent chromium in the solution is rapidlyand accurately measured. The Cr<6+> detection method provided by the invention is simple and convenient to operate, rapid in detection and low in cost and is suitable for chromium-contaminated site repair, acceptance and detection. The method has the broad application value.

Description

technical field [0001] The invention belongs to the technical field of hexavalent chromium detection methods, and in particular relates to a detection method of hexavalent chromium content in soil. Background technique [0002] Soil pollution comes from a wide range of heavy metal pollution sources, such as unreasonable discharge of "three wastes" in mineral processing and smelting, electroplating, batteries, chemicals, dyes and other industries, sewage irrigation, sludge fertilization, vehicle exhaust emissions in urban transportation, improper disposal of electronic waste, etc. , leading to heavy metal pollution in the soil. Soil heavy metal pollution has the characteristics of poor mobility, long residence time, and irreversibility of pollutants in the soil, resulting in decreased soil fertility, reduced crop yield and quality, and polluted groundwater and surface water through runoff and leaching. [0003] Among chemical pollutants, chromium is one of the most common an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/78G01N1/44
CPCG01N1/44G01N21/31G01N21/78
Inventor 颜湘华王兴润张丹枫史开宇
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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