硝酸盐对土壤吸附一硫代砷的影响特征及机理

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Abstract In this study, batch experiments were carried out to investigate the effects of NO₃^- (0~50mg/L) addition on monothioarsenate (MTA) adsorption by natural soil. Characterization analysis of XRD, SEM-EDS, XPS, etc. was conducted to further identify the mechanisms. Results showed that: (1) the equilibrium adsorption capacity of MTA on soil (Q_e) gradually increased with the increase of NO₃^- concentrations. Specifically, when the NO₃^- concentration increased from 0to 50mg/L, Q_e increased from 27.73mg/kg to 32.95mg/kg,respectively. Besides, SEM-EDS results showed that after the reaction, the As content of the soil increased slightly with the increasing concentrations of NO₃^- in the reaction system. These findings indicated that the presence of NO₃^- can promote the adsorption of MTA on soil, and higher concentrations of NO₃^- lead to more MTA adsorbed by soil. (2) After MTA adsorption, the NO₃^- content in the solution decreased to various degrees and NH₄⁺ was detected in the MTA-soil-NO₃^- system, meanwhile aluminum oxides and iron oxides containing arsenic and nitrogen were formed on the surface of soil. This was attributed to the fact that MTA was mainly adsorbed by iron and aluminum oxides in soil. When NO₃^- was present in the reaction system, accompanied by NO₃^- partially reduction to NH₄⁺, Fe(II) was oxidized to Fe(III) (hydrogen) oxide on the soil surface, which helped improve the MTA adsorption.

Key words： monothioarsenate soil nitrate reaction mechanism species distribution

Received: 09 February 2023

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X131.3

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	SHI Qian
	SHAN Hui-mei
	LIU Ji-gang
	LI Zhe-ying
	ZHANG Jin-xian

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SHI Qian,SHAN Hui-mei,LIU Ji-gang等. Characteristics and mechanism of nitrate on adsorption of monothioarsenate in soil[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4750-4759.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4750

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