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Method for determining cyanide and total cyanide in soil

A technology of cyanide and soil, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators, etc. It can solve the problems of cumbersome process, long analysis time, and the production of highly toxic HCN. , to achieve the effect of improving detection efficiency, reducing labor intensity and fast detection speed

Pending Publication Date: 2021-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is also cumbersome and takes longer to analyze, and the highly toxic substance HCN will be produced during the distillation process, which has certain potential safety hazards

Method used

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  • Method for determining cyanide and total cyanide in soil
  • Method for determining cyanide and total cyanide in soil
  • Method for determining cyanide and total cyanide in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for measuring cyanide and total cyanide in soil comprises: an extraction process, a color development process and a colorimetric process.

[0042] (1) Extraction process:

[0043] 1.1. Weigh 0.1-25g soil sample.

[0044] 1.2. Put the weighed soil sample into a 2-100mL airtight glass container.

[0045] 1.3. Add 1-50mL sodium hydroxide solution (0.1g / L-100g / L) into it.

[0046] 1.4. Vigorously shake on a vortex shaker for 0.1-30 minutes, centrifuge or filter the extract, and set aside.

[0047] (2) Color development process:

[0048] 2.1. Take 0.5-25 mL of the extract obtained in step 1.4, add an appropriate amount of sulfuric acid solution (1:2), and adjust the pH value to 5-10.

[0049] 2.2. Add 0.5-5mL p-methoxyphenol sulfate solution (1-10g / L), 0.1-1mL carrageenan solution (1-10g / L) and 0.1-1mL ferric chloride solution (1-20g / L ), diluted with purified water to 5-100mL, and mixed well. Stand in the dark for 1-60 minutes.

[0050] (3) Colorimetric proc...

Embodiment 2

[0055] A method for measuring cyanide and total cyanide in soil is roughly the same as the method for testing soil cyanide provided in Example 1, the difference is that the parameters are different, and the difference is as follows:

[0056] During color development, the pH was adjusted to 5.

Embodiment 3

[0058] A method for measuring cyanide and total cyanide in soil is roughly the same as the method for testing soil cyanide provided in Example 1, the difference is that the parameters are different, and the difference is as follows:

[0059] During color development, the pH was adjusted to 7.

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Abstract

The invention discloses a method for determining cyanide and total cyanide in soil, and relates to the technical field of cyanide detection. The method comprises the steps that an extracting solution obtained after a soil sample is extracted through an alkaline solution, a Fe<3+> solution and a reducing agent are subjected to a chromogenic reaction in a colloidal solution, and the content of cyanide in the soil sample is determined. According to the method, the sample does not need to be subjected to distillation pretreatment, generation of HCN is avoided, the method is safe and reliable, large-batch detection can be carried out at the same time, the detection speed is high, the cost is low, and compared with traditional HJ 745-2015, the labor intensity and the analysis cost are greatly reduced, and the detection efficiency of the cyanide and the total cyanide in the soil is improved.

Description

technical field [0001] The invention relates to the technical field of cyanide detection, in particular to a method for measuring cyanide and total cyanide in soil. Background technique [0002] Cyanide has good complexing performance, surface activity and activation performance, which makes it widely used in dye coating, gold smelting, metal processing, electroplating, organic chemical industry and other industries, but it also brings serious environmental pollution problems. [0003] Currently, methods for the determination of cyanide in soils have some drawbacks. For example, HJ 745-2015 "Spectrophotometric method for the determination of soil cyanide and total cyanide": take a 10g dry weight soil sample, convert the cyanide in the soil to HCN under acidic conditions, distill, and distill with water vapor To the receiving bottle into sodium cyanide. The distilled solution is used for colorimetry by isonicotinic acid-barbituric acid or isonicotinic acid-pyrazolone spectr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 王乾李磊李怿白正伟李翔
Owner CHINA PETROLEUM & CHEM CORP
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