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Method for determining soil cyanide and total cyanide

A determination method and technology of cyanide, which are applied in material analysis, measuring device, preparation of test samples by observing the effect on chemical indicators, etc., can solve the problem of inability to guarantee uniformity, long color development time, affecting accuracy and other problems to achieve the effect of ensuring precision and accuracy, avoiding damage to the instrument, and protecting it from damage

Active Publication Date: 2020-06-26
四川省天晟源环保股份有限公司
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Problems solved by technology

The water bath needs 40 minutes for the color development of the sample, and the color development time is longer
[0010] 4. In the prior art, the soil samples tested are all fresh samples, and the uniformity cannot be guaranteed when sampling fresh soil samples, such as having different soil moisture contents, which affects the accuracy of the method detection

Method used

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

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Embodiment 1

[0038] Collect the soil, adjust the pH value of the soil sample to be alkaline, preferably add 1mol / L sodium hydroxide solution, and adjust the pH value of the soil sample to 12. After low-temperature adsorption drying at 4°C to 30°C, it can be dried at any temperature lower than the natural environment within the range of 5°C, 10°C, 15°C, 20°C, 25°C, 30°C and 4°C to 30°C to obtain Dry the soil sample. Crush the soil sample, pick out obvious impurities, such as stones, metal particles, tree roots, plastic particles, fiber filaments, etc., use electrostatic adsorption to remove organic impurity particles in the soil sample, and pass through a 16-mesh sieve to obtain a soil sample. use. Sieve to remove particulate impurities in the soil. The sieved fine powder soil sample can be more fully mixed with the reaction solution to make the reaction more complete.

[0039] Accurately weigh 10.00 g of the soil sample into a distillation flask.

[0040]Distillation is carried out in ...

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Abstract

The invention discloses a method for determining soil cyanide and total cyanide. The method comprises the following steps: regulating the pH value of a soil sample to be alkaline, preparing an impurity-free soil sample, and quantitatively weighing the soil sample; and distilling the soil sample, collecting distillate by using absorption liquid, and measuring by using a continuous flow analyzer toobtain the concentration of cyanide or total cyanide in the soil. The total cyanide content of the soil is determined by adopting the modes of soil sample distillation and continuous flow analyzer determination, interference can be eliminated, instruments are prevented from being damaged, detection personnel are safer, analysis equipment can be protected from being damaged, and meanwhile, the detection work is more efficient. Low-temperature drying, electrostatic adsorption, sieving and other treatment are adopted, a soil sample with more standardized characteristics can be obtained, the influence of metal impurities and organic impurities on a measurement result is avoided, soil is adjusted to be alkaline before drying, it is guaranteed that no cyanide overflows in the low-temperature drying process, and the precision and accuracy of the detection result are fully guaranteed.

Description

technical field [0001] The invention belongs to the technical field of environmental detection and relates to a method for measuring cyanide, in particular to a method for measuring total cyanide in soil and a method for measuring cyanide in soil. Background technique [0002] Cyanide refers to the compound containing cyano group (-CN) in the compound molecule, which is a highly toxic compound. [0003] Total cyanide refers to the sum of organic cyanides, free cyanide ions, complexes and simple metal cyanides. Cobalt cyanide complexes and rhodanides are not included. Free cyanide refers to the sum of free cyanide ions and simple metal cyanides, excluding organic cyanides. [0004] In the environment mainly HCN, CN - Exist in the form of complex cyanide ions. Human activities such as gold production, electroplating chemical industry, organic chemical industry and other industries have brought a large amount of cyanide-containing wastewater; they have caused great harm to ...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/28G01N1/40
CPCG01N1/28G01N1/4022G01N1/4044G01N21/78G01N2001/4033
Inventor 刘霞张济龙李美玲刘真周玉洁谢飞张卫威童贤清魏莉闵姚群徐海鑫魏文祥张红母万银
Owner 四川省天晟源环保股份有限公司
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