Method for determining soil total cyanide--isonicotinic acid--barbituric acid spectrophotometric method

Inactive Publication Date: 2008-09-03
谱尼测试集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no method to analyze the total cyanide in soil by isonicotinic acid-barbituric acid spectrophotometry in the country.

Method used

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  • Method for determining soil total cyanide--isonicotinic acid--barbituric acid spectrophotometric method
  • Method for determining soil total cyanide--isonicotinic acid--barbituric acid spectrophotometric method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, the detection of soil sample 1# total cyanide concentration:

[0026] Weigh 5.1079g of soil sample 1# to be tested, and add 200mL of distilled water and a few glass beads to a 500mL distillation flask. Add 10mL Na to the distillation flask 2 - EDTA solution and 7-8 drops of methyl orange indicator. Add 10mL of 1% sodium hydroxide solution into the receiving bottle (100mL graduated cylinder) as the absorption liquid, the upper end of the distillate conduit is connected to the outlet of the condenser tube, and the lower end is inserted at least 1cm below the absorption liquid of the receiving bottle. Quickly add 10mL of phosphoric acid to the distillation flask to make the pH<2, and immediately cover the cork. Turn on the condensed water, adjust the adjustable electric furnace, heat and distill the distillate at a rate of 2-4mL / min, and keep the solution in the distillation bottle red. Stop distillation when the solution in the receiving bottle is close t...

Embodiment 2

[0033] The detection of embodiment 2 soil sample 2# total cyanide concentration:

[0034] Weigh 10.0014g of soil sample 2# to be tested, and add 200mL of distilled water and several glass beads to a 500mL distillation flask. Add 10mL Na to the distillation flask 2 - EDTA solution and 7-8 drops of methyl orange indicator. Add 10mL of 1% sodium hydroxide solution into the receiving bottle (100mL graduated cylinder) as the absorption liquid, the upper end of the distillate conduit is connected to the outlet of the condenser tube, and the lower end is inserted at least 1cm below the absorption liquid of the receiving bottle. Quickly add 10mL of phosphoric acid to the distillation flask to make the pH<2, and immediately cover the cork. Turn on the condensed water, adjust the adjustable electric furnace, heat and distill the distillate at a rate of 2-4mL / min, and keep the solution in the distillation bottle red. Stop distillation when the solution in the receiving bottle is close...

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PUM

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Abstract

The invention provides a test method, which includes the following steps: distilling soil in pH<2 acidic medium, hydrogen cyanide is formed, absorbing with the sodium hydrate solution, and analyzing total cyanide in soil with isonicotinic acid-barbituric acid spectrophotometry. The invention has the advantages of good sensitivity and good repeatability, which provides a convenient and reliable method for analyzing total cyanide in soil, and meets the needs of soil pollutant analysis as well as research work.

Description

technical field [0001] The invention relates to a method for measuring total cyanide in soil, which is a method for developing color with isonicotinic acid-barbituric acid and quantitatively analyzing with an ultraviolet-visible spectrophotometer. Background technique [0002] Cyanide is a highly toxic substance, and its toxicity to the human body is mainly due to its combination with ferricytochrome oxidase to generate cyanide ferricytochrome oxidase, which loses the function of transferring oxygen and causes tissue hypoxia asphyxia. The main source of cyanide in soil is man-made pollution sources, such as small gold mine mining, smelting, electroplating, organic chemical industry, mineral processing and other industrial waste water polluting nearby and downstream soil resources. When people use these land resources, they will affect people's health. constitutes a great health hazard. At present, there is no method for analyzing total cyanide in soil by isonicotinic acid-b...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/78G06F19/00
Inventor 宋薇
Owner 谱尼测试集团股份有限公司
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