Arsenic Release from Soil Induced by Microorganisms and Environmental Factors

Yitong Yin, Ximing Luo, Xiangyu Guan, Jiawei Zhao, Yuan Tan, Xiaonan Shi, Mingtao Luo and Xiangcai Han
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Yitong Yin: School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
Ximing Luo: School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
Xiangyu Guan: School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
Jiawei Zhao: School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
Yuan Tan: School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
Xiaonan Shi: School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
Mingtao Luo: School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
Xiangcai Han: School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China

IJERPH, 2022, vol. 19, issue 8, 1-15

Abstract: In rhizospheric soil, arsenic can be activated by both biological and abiotic reactions with plant exudates or phosphates, but little is known about the relative contributions of these two pathways. The effects of microorganisms, low-molecular-weight organic acid salts (LMWOASs), and phosphates on the migration of As in unrestored and nano zero-valent iron (nZVI)-restored soil were studied in batch experiments. The results show that As released by microbial action accounted for 17.73%, 7.04%, 92.40%, 92.55%, and 96.68% of the total As released in unrestored soil with citrate, phytate, malate, lactate, and acetate, respectively. It was only suppressed in unrestored soil with oxalate. In restored soil, As was still released in the presence of oxalate, citrate, and phytate, but the magnitude of As release was inhibited by microorganisms. The application of excess nZVI can completely inhibited As release processes induced by phosphate in the presence of microorganisms. Microbial iron reduction is a possible mechanism of arsenic release induced by microorganisms. Microorganisms and most environmental factors promoted As release in unrestored soil, but the phenomenon was suppressed in restored soil. This study helps to provide an effective strategy for reducing the secondary release of As from soils due to replanting after restoration.

Keywords: low-molecular-weight organic acid salts; phosphate; arsenic-contaminated soil; microorganisms; nano zero-valent iron (nZVI) (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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