Method for determining sulfide content of soil

Abstract

The invention discloses a method for determining the sulfide content of soil. The method comprises: weighing a proper amount of a soil sample and putting it into a reaction bottle equipped with a sand core, adding an alkaline deoxidizing deionized water mixed solution dissolved with Zn(AC)2.2H20 and NaAC.3H2O and stirring the mixture evenly; subjecting the reaction bottle to heating water bath to make sulfides in soil generate zinc sulfide precipitates and immobilizing the precipitates, blowing air into the reaction bottle and performing bubbling through the sand core, and blowing out volatile organic interferents in the soil; adding dilute sulfuric acid to produce a hydrogen sulfide gas, blowing air into the reaction bottle to load the hydrogen sulfide gas into a spectrometer; letting the spectrometer to perform absorption at a 202.6nm wavelength place of the hydrogen sulfide gas, using a zinc hollow cathode lamp to measure the absorbance at the wavelength place; and comparing the determined absorbance with the absorbance of a sulfide standard solution to obtain the sulfide content of the soil. The method provided by the invention can efficiently and rapidly determine the sulfide content of the soil, is suitable for mass soil analysis, and satisfies the precision requirement for detecting sulfur-containing organic matters in soil.

Description

technical field [0001] The invention relates to a method for measuring sulfide content in soil. Background technique [0002] The sulfur-containing organic matter in the soil will produce inorganic sulfides during the anaerobic decomposition process; sulfates can also be affected by microorganisms to form sulfides under reduced conditions. Sulfide pre-acid produces hydrogen sulfide, hydrogen sulfide is easy to escape into the air, produces odor, and is very toxic. It can interact with cytochromes, oxidases and disulfide bonds in such substances in the human body, affect the oxidation process of cells, cause hypoxia in cells and tissues, and endanger human life. Therefore, sulfide is an important indicator for soil monitoring. [0003] Common monitoring methods for sulfide in soil include the soil substrate p-diethylaminoaniline colorimetric method, iodometric method, etc. The soil substrate can be the mud at the bottom of the river and the rotting animal and plant corpses ...

AI Technical Summary

Problems solved by technology

However, the pretreatment operation of the sulfide analysis method in the substrate is very complicated. In addition to using high-purity nitrogen as the carrier gas, a whole set of cumbersome separation and fixing devices need to be connected, which takes up a lot of space, and the method is inconvenient to apply. The time is generally about 60 minutes / sample, the efficiency is very low, and it is not suitable for mass analysis of soil

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