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Method for determining content of sulfide in soil

A determination method and technology of sulfide, applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems of lack of environmental temperature control, decreased accuracy of test results, complicated operation steps, etc., and achieve the use of fewer types of reagents , determination speed, high reaction recovery effect

Inactive Publication Date: 2019-01-01
SHANGHAI ANJIE ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the existing detection method has complicated operation steps, among which, adding dilute hydrochloric acid or dilute sulfuric acid to generate hydrogen sulfide gas after removing the interference of organic matter, and loading it into the spectrometer lacks the control of the ambient temperature
Due to the high solubility of hydrogen sulfide gas in water, it is more sensitive to temperature changes. Therefore, the temperature changes caused by instrument work and chemical reactions will significantly affect the amount of sulfide loaded into the spectrometer, which will eventually lead to a decrease in the accuracy of the detection results.

Method used

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  • Method for determining content of sulfide in soil

Examples

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Effect test

Embodiment 1

[0026] A method for determining the content of sulfide in soil, such as figure 1 As shown, the method includes the following steps:

[0027] 1) Add ascorbic acid, disodium edetate and sodium hydroxide to water, and mix well to obtain an antioxidant solution, wherein, for every 100mL of water, add 1.8g ascorbic acid, 0.12g disodium edetate and 0.3 g sodium hydroxide;

[0028] 2) Weigh the soil sample, add the soil sample to the water, then add the antioxidant solution, mix well to obtain the sample solution, wherein, for every 100mL of water, add 25g of the soil sample and 3mL of the antioxidant solution;

[0029] 3) Heat the sample solution and dilute hydrochloric acid solution to 80°C respectively, and then add them together to the reaction bottle of the gas phase molecular absorption spectrometer for reaction;

[0030] 4) Using nitrogen as the carrier gas, send the hydrogen sulfide gas generated by the reaction into the light absorption device of the gas phase molecular ab...

Embodiment 2

[0032] A method for determining the content of sulfide in soil, such as figure 1 As shown, the method includes the following steps:

[0033] 1) Add ascorbic acid, disodium edetate and sodium hydroxide to water, and mix well to obtain an antioxidant solution, wherein, for every 100mL of water, add 2.2g ascorbic acid, 0.08g disodium edetate and 0.7 g sodium hydroxide;

[0034] 2) Weigh the soil sample, add the soil sample to the water, then add the antioxidant solution, and mix well to obtain the sample solution, wherein, for every 100mL of water, add 15g of the soil sample and 7mL of the antioxidant solution;

[0035] 3) Heat the sample solution and dilute hydrochloric acid solution to 60°C respectively, and then add them together to the reaction bottle of the gas phase molecular absorption spectrometer for reaction;

[0036] 4) Using nitrogen as the carrier gas, send the hydrogen sulfide gas generated by the reaction into the light absorption device of the gas phase molecula...

Embodiment 3

[0038] A method for determining the content of sulfide in soil, such as figure 1 As shown, the method includes the following steps:

[0039] 1) Add ascorbic acid, disodium edetate and sodium hydroxide to water, mix well to obtain an antioxidant solution, wherein, for every 100mL of water, add 2g ascorbic acid, 0.1g disodium edetate and 0.5g sodium hydroxide;

[0040] 2) Weigh the soil sample, add the soil sample to the water, then add the antioxidant solution, and mix well to obtain the sample solution, wherein, for every 100mL of water, add 20g of the soil sample and 5mL of the antioxidant solution;

[0041] 3) Heat the sample solution and dilute hydrochloric acid solution to 70°C respectively, and then add them together to the reaction flask of the gas phase molecular absorption spectrometer for reaction;

[0042] 4) Using air as the carrier gas, send the hydrogen sulfide gas generated by the reaction into the light absorption device of the gas phase molecular absorption s...

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Abstract

The invention relates to a method for determining the content of sulfide in soil. The method comprises the following steps: (1) measuring a soil sample, and preparing a test sample solution; and (2) separately heating the test sample solution and a hydrochloric acid solution to 60 to 80 DEG C, adding into a reaction bottle of a gaseous molecular absorption spectrometer for reaction; (3) sending hydrogen sulfide gas generated in the reaction into a light absorption device of the gaseous molecular absorption spectrometer by utilizing carrier gas, determining absorbance, and thus obtaining the content of sulfide in the soil sample according to the absorbance of sulfide standard solutions of different concentrations. Compared with the prior art, before the mixing reaction of the test sample solution and the hydrochloric acid solution, the test sample solution and the hydrochloric acid solution are firstly preheated, the reaction in the reaction bottle is performed at 60 to 80 DEG C, higherreaction recovery rate can be obtained, a target substance in the test sample solution is more complete in reaction, the determination result is more accurate, fewer types and less amount of the reagents are used, the determination speed is high, and the disturbance resistance is high.

Description

technical field [0001] The invention belongs to the technical field of soil detection and relates to a method for measuring sulfide content in soil. Background technique [0002] At present, the detection steps of the sulfide content in the soil are mainly: leaching the sulfide in the soil, removing the organic matter that interferes with the test, and then reacting the sulfide contained in it with the alkaline solution of sodium acetate and zinc acetate to form a precipitate or suspension Then add dilute hydrochloric acid or dilute sulfuric acid to generate hydrogen sulfide, and finally add other chemical substances and use colorimetric detection, or directly load hydrogen sulfide gas into a spectrometer for detection. [0003] However, the existing detection method has complicated operation steps, among which the step of adding dilute hydrochloric acid or dilute sulfuric acid to generate hydrogen sulfide gas and loading it into a spectrometer lacks the control of the ambie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N1/44G01N1/38
CPCG01N1/38G01N1/44G01N21/33
Inventor 刘盼西刘丰奎郝俊刘剑萍牛军刘忠强王建孙璐曾祥丽
Owner SHANGHAI ANJIE ENVIRONMENTAL PROTECTION TECH
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