Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Hong, Zebin1,2,3; Hu, Shiwen2; Yang, Yang2 ; Deng, Ziwei2,4; Li, Xiaomin5,6; Liu, Tongxu2; Li, Fangbai2
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| The key roles of Fe oxyhydroxides and humic substances during the transformation of exogenous arsenic in a redox-alternating acidic paddy soil | |
| Source Publication | WATER RESEARCH
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| ISSN | 0043-1354 |
| 2023-08-15 | |
| Volume | 242Pages:11 |
| DOI | 10.1016/j.watres.2023.120286 |
| Language | 英语 |
| WOS Research Area | Engineering ; Environmental Sciences & Ecology ; Water Resources |
| Abstract | Arsenic (As) from mine wastewater is a significant source for acidic paddy soil pollution, and its mobility can be influenced by alternating redox conditions. However, mechanistic and quantitative insights into the biogeochemical cycles of exogenous As in paddy soil are still lacking. Herein, the variations of As species in paddy soil spiking with As(III) or As(V) were investigated in the process of 40 d of flooding followed 20 d of drainage. During flooding process, available As was immobilized in paddy soil spiking As(III) and the immobilized As was activated in paddy soil spiking As(V) owing to deprotonation. The contributions of Fe oxyhydroxides and humic substances (HS) to As immobilization in paddy soil spiking As(III) were 80.16% and 18.64%, respectively. Whereas the contributions of Fe oxyhydroxides and HS to As activation in paddy soil spiking As(V) were 47.9% and 52.1%, respectively. After entering drainage, available As was mainly immobilized by Fe oxyhydroxides and HS and adsorbed As(III) was oxidized. The contribution of Fe oxyhydroxides to As fixation in paddy soil spiking As(III) and As(V) was 88.82% and 90.26%, respectively, and of HS to As fixation in paddy soil spiking As(III) and As(V) was 11.12% and 8.95%, respectively. Based on the model fitting results, the activation of Fe oxyhydroxides and HS bound As followed with available As(V) reduction were key processes during flooding. This may be because the dispersion of soil particles and release of soil colloids activated the adsorbed As. Immobilization of available As(III) by amorphous Fe oxyhydroxides followed with adsorbed As(III) oxidation were key processes during drainage. This may be ascribe to the occurrence of coprecipitation and As(III) oxidation mediated by reactive oxygen species from Fe(II) oxidation. The results are beneficial for a deeper understanding of As species transformation at the interface of paddy soil-water as well as an estimation pathway for the impacts of key biogeochemical cycles on exogenous As species under a redox-alternating condition. |
| Keyword | Paddy soil Exogenous arsenic Fe oxyhydroxides Humic substances Kinetic model |
| WOS ID | WOS:001036831100001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/74557 |
| Collection | 中国科学院广州地球化学研究所 |
| Corresponding Author | Liu, Tongxu |
| Affiliation | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Natl Reg Joint Engn Res Ctr Soil Pollut Control &, Guangdong Key Lab Integrated Agroenvironm Pollut C, Guangzhou 510650, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Jinan Univ, Sch Environm, Guangdong Key Lab Environm Pollut & Hlth, Guangzhou 510632, Peoples R China 5.South China Normal Univ, SCNU Environm Res Inst, Guangdong Prov Key Lab Chem Pollut & Environm Safe, Guangzhou 510006, Peoples R China 6.South China Normal Univ, MOE Key Lab Theoret Chem Environm, Guangzhou 510006, Peoples R China |
| Recommended Citation GB/T 7714 | Hong, Zebin,Hu, Shiwen,Yang, Yang,et al. The key roles of Fe oxyhydroxides and humic substances during the transformation of exogenous arsenic in a redox-alternating acidic paddy soil[J]. WATER RESEARCH,2023,242:11. |
| APA | Hong, Zebin.,Hu, Shiwen.,Yang, Yang.,Deng, Ziwei.,Li, Xiaomin.,...&Li, Fangbai.(2023).The key roles of Fe oxyhydroxides and humic substances during the transformation of exogenous arsenic in a redox-alternating acidic paddy soil.WATER RESEARCH,242,11. |
| MLA | Hong, Zebin,et al."The key roles of Fe oxyhydroxides and humic substances during the transformation of exogenous arsenic in a redox-alternating acidic paddy soil".WATER RESEARCH 242(2023):11. |
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