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Method for detecting Cr<6+> in soil containing a large number of reducing agents

A detection method and technology of reducing agent are applied in material analysis, measuring device, preparation of test samples by observing the influence on chemical indicators, etc., which can solve problems such as harming human health and inability to accurately measure soil content, etc. Achieve the effect of low cost, fast detection, simple and convenient operation

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

[0005] As one of the heavy metal ions, hexavalent chromium (Cr(VI)) accumulates in the soil for a long time because it cannot be degraded by microorganisms, and can be bioaccumulated, eventually causing it to seriously endanger human health through the food chain
However, this method can only be used to detect the total chromium content in the soil, and cannot accurately measure the Cr content in the soil. 6+ content of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Soil Cr after ferrous sulfate reduction 6+ detection

[0058] (1) Dissolve 2.5g of soil in water according to the mass volume ratio of 1:8g / mL, add potassium persulfate, the molar ratio of ferrous sulfate to potassium persulfate is 1:1.5, react for 40min, and centrifuge to obtain solid 1 and liquid 2;

[0059] (2) Add water to solid 1 according to the mass volume ratio of 1:8g / mL, centrifuge at a speed of 1800r / min, and centrifuge for 4min, repeat 8 times to obtain solid 3 and liquid 4;

[0060] (3) Adopt sulfuric acid solution to adjust the pH of liquid 4 to 1.5, add diphenylcarbazide acetone solution, develop color, constant volume, measure the absorbance value of liquid 4 after constant volume, take Cr 2 o 7 2- Draw an absorbance standard curve for the standard substance, and determine Cr in liquid 4 according to the absorbance value of liquid 4 on the standard curve 6+ The mass of is m1;

[0061] (4) The solid 3 is subjected to alkali digestion with reference ...

Embodiment 2

[0064] Soil Cr after sodium sulfide reduction 6+ detection

[0065] (1) Dissolve 2.5g of soil in water according to the mass volume ratio of 1:12g / mL, add potassium persulfate, the molar ratio of sodium sulfide to potassium persulfate is 1:2.5, react for 60min, and centrifuge to obtain solid 1 and liquid 2 ;

[0066] (2) Add water to solid 1 according to the mass volume ratio of 1:12g / mL, centrifuge at a speed of 2200r / min, and centrifuge for 6min, repeat 12 times to obtain solid 3 and liquid 4;

[0067] (3) Adopt sulfuric acid solution to regulate the pH of liquid 4 to 2.5, add diphenylcarbazide acetone solution, develop color, constant volume, record the absorbance value of liquid 4 after constant volume, take Cr 2 o 7 2- Draw an absorbance standard curve for the standard substance, and determine Cr in liquid 4 according to the absorbance value of liquid 4 on the standard curve 6+ The mass of is m1;

[0068] (4) Carry out alkali digestion (specifically referring to Exa...

Embodiment 3

[0071] Soil Cr after calcium polysulfide reduction 6+ detection

[0072] (1) Dissolve 2.5g of soil in water according to the mass volume ratio of 1:8g / mL, add potassium persulfate, the molar ratio of calcium polysulfide to potassium persulfate is 1:3.5, react for 40min, and centrifuge to obtain solid 1 and liquid 2;

[0073] (2) Add water to solid 1 according to the mass volume ratio of 1:8g / mL, centrifuge at a speed of 1800r / min, and centrifuge for 4min, repeat 8 times to obtain solid 3 and liquid 4;

[0074] (3) Adopt sulfuric acid solution to adjust the pH of liquid 4 to 1.5, add diphenylcarbazide acetone solution, develop color, constant volume, measure the absorbance value of liquid 4 after constant volume, take Cr 2 o 7 2- Draw an absorbance standard curve for the standard substance, and determine Cr in liquid 4 according to the absorbance value of liquid 4 on the standard curve 6+ The mass of is m1;

[0075] (4) Carry out alkali digestion (specifically referring t...

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Abstract

The invention relates to the technical field of chemical component detection, in particular to a method for detecting Cr<6+> in soil containing a large number of reducing agents. The method comprisesthe following steps: (1), dissolving soil in water, adding potassium persulfate, and carrying out centrifuging to obtain solid 1 and liquid 2; (2), adding water into the solid 1, and carrying out centrifuging to obtain solid 3 and liquid 4; (3), measuring the mass m1 of Cr<6+> in the liquid 4; (4), carrying out alkali digestion on the solid 3 and carrying out filtering to obtain filtrate, and measuring the mass m2 of Cr<6+> in the filtrate; and (5) calculating the total amount m being equal to m1+m2 of Cr<6+> in the soil. The method has the advantages of eliminating interference of excessive reducing agents, and being rapid and accurate.

Description

technical field [0001] The invention relates to the technical field of chemical composition detection, in particular to a Cr in soil containing a large amount of reducing agent 6+ detection method. Background technique [0002] Soil is an important material basis for human production and life. Industries such as electroplating, tanning, metallurgy, petrochemicals, and pesticide production can produce a large amount of heavy metals such as copper, chromium, nickel, and lead, which enter the soil through irrigation, precipitation, and atmospheric deposition. Once the soil is polluted, its ecological value, economic value, and social value cannot be brought into play, which not only directly leads to the waste of land resources, but also endangers ecological security and human health. [0003] Among them, chromium and its compounds are widely used as industrial raw materials in various fields. Chromium pollution is mainly formed through industrial applications and emissions ...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78G01N1/44G01N1/34
CPCG01N1/34G01N1/44G01N21/3103G01N21/78
Inventor 颜湘华王兴润张丹枫史开宇
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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