Optimal Relationship Between As and Cd in Porewater of Paddy Soils with Variations in pe + pH: Insight from Trade-Off Value Analysis

Xiaosong Tian (), Jiahang Li, Guanqun Chai (), Dayong Luo, Yalong Gong, Huang Liu, Qing Xie and Guanghui Li
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Xiaosong Tian: College of Resources and Safety, Chongqing Vocational Institute of Engineering, Chongqing 402260, China
Jiahang Li: College of Resources and Environment, Southwest University, Chongqing 400715, China
Guanqun Chai: Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
Dayong Luo: College of Resources and Safety, Chongqing Vocational Institute of Engineering, Chongqing 402260, China
Yalong Gong: Chongqing Engineering Research Center for Soil Contamination Control and Remediation, Chongqing 400067, China
Huang Liu: Chongqing Engineering Research Center for Soil Contamination Control and Remediation, Chongqing 400067, China
Qing Xie: College of Resources and Safety, Chongqing Vocational Institute of Engineering, Chongqing 402260, China
Guanghui Li: Chongqing Engineering Research Center for Soil Contamination Control and Remediation, Chongqing 400067, China

Agriculture, 2024, vol. 14, issue 11, 1-15

Abstract: The remediation of paddy soils co-contaminated with As and Cd is tricky. It is difficult to decrease Cd and As availability simultaneously due to their opposite geochemical characteristics. Finding the optimal trade-off relationship between As and Cd availability in paddy soils is a significant task that is necessary to guide the construction of water management measures. This study investigated the dissolution characteristics of As, Cd, Fe, Mn, DOC, DOM, and various As and Cd fractions in soils via the microcosm system and calculated the optimal trade-off value for available As and Cd in porewater. The results showed that the total As in porewater increased rapidly when the soil Eh was reduced to −104 mV. Meanwhile, the total Cd in porewater decreased dramatically when the soil Eh was below 62 mV. Under flooding and drainage conditions, Fe/Mn (oxyhydro)oxides play a vital role in regulating Cd dissolution in paddy soils, while Fe/Mn (oxyhydro)oxides organically bind sulfide together to determine the dissolution of As. Additionally, the optimal pe + pH response to the minimum trade-off value of available As and Cd in porewater was found to be 6.6, which indicates a moderate reduction status. Therefore, further research should apply the optimal pe + pH to construct water management measures to safely utilize co-contaminated paddy fields.

Keywords: water management; dissolved As and Cd; dissolved organic matter; Fe/Mn (oxyhydro)oxides; pe + pH; trade-off value (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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