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Simultaneous alleviation of cadmium and arsenic accumulation in rice by applying zero-valent iron and biochar to contaminated paddy soils.
Chemosphere. 2018 Mar; 195:260-271.C

Abstract

The fates of cadmium (Cd) and arsenic (As) in paddy fields are generally opposite; thus, the inconsistent transformation of Cd and As poses large challenges for their remediation. In this study, the impacts of zero valent iron (ZVI) and/or biochar amendments on Cd and As bioavailability were examined in pot trials with rice. Comparison with the untreated soil, both Cd and As accumulation in different rice tissues decreased significantly in the ZVI-biochar amendments and the Cd and As accumulation in rice decreased with increasing ZVI contents. In particular, the concentrations of Cd (0.15 ± 0.01 mg kg-1) and As (0.17 ± 0.01 mg kg-1) in rice grains were decreased by 93% and 61% relative to the untreated soil, respectively. A sequential extraction analysis indicated that with increasing Fe ratios in the ZVI-biochar mixtures, bioavailable Cd and As decreased, and the immobilized Cd and As increased. Furthermore, high levels of Fe, Cd, and As were detected in Fe plaque of the ZVI-biochar amendments in comparison with the single biochar or single ZVI amendments. The ZVI-biochar mixture may have a synergistic effect that simultaneously reduces Cd and As bioavailability by increasing the formation of amorphous Fe and Fe plaque for Cd and As immobilization. The single ZVI amendment significantly decreased As bioavailability, while the single biochar amendment significantly reduced the bioavailability of Cd compared with the combined amendments. Hence, using a ZVI-biochar mixture as a soil amendment could be a promising strategy for safely-utilizing Cd and As co-contaminated sites in the future.

Authors+Show Affiliations

Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China; Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China. Electronic address: cefbli@soil.gd.cn.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou 510650, PR China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29272795

Citation

Qiao, Jiang-Tao, et al. "Simultaneous Alleviation of Cadmium and Arsenic Accumulation in Rice By Applying Zero-valent Iron and Biochar to Contaminated Paddy Soils." Chemosphere, vol. 195, 2018, pp. 260-271.
Qiao JT, Liu TX, Wang XQ, et al. Simultaneous alleviation of cadmium and arsenic accumulation in rice by applying zero-valent iron and biochar to contaminated paddy soils. Chemosphere. 2018;195:260-271.
Qiao, J. T., Liu, T. X., Wang, X. Q., Li, F. B., Lv, Y. H., Cui, J. H., Zeng, X. D., Yuan, Y. Z., & Liu, C. P. (2018). Simultaneous alleviation of cadmium and arsenic accumulation in rice by applying zero-valent iron and biochar to contaminated paddy soils. Chemosphere, 195, 260-271. https://doi.org/10.1016/j.chemosphere.2017.12.081
Qiao JT, et al. Simultaneous Alleviation of Cadmium and Arsenic Accumulation in Rice By Applying Zero-valent Iron and Biochar to Contaminated Paddy Soils. Chemosphere. 2018;195:260-271. PubMed PMID: 29272795.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Simultaneous alleviation of cadmium and arsenic accumulation in rice by applying zero-valent iron and biochar to contaminated paddy soils. AU - Qiao,Jiang-Tao, AU - Liu,Tong-Xu, AU - Wang,Xiang-Qin, AU - Li,Fang-Bai, AU - Lv,Ya-Hui, AU - Cui,Jiang-Hu, AU - Zeng,Xiao-Duo, AU - Yuan,Yu-Zhen, AU - Liu,Chuan-Ping, Y1 - 2017/12/13/ PY - 2017/07/11/received PY - 2017/11/01/revised PY - 2017/12/12/accepted PY - 2017/12/23/pubmed PY - 2018/5/19/medline PY - 2017/12/23/entrez KW - Bioavailable As and Cd KW - Biochar KW - Fe fractions KW - Paddy soil KW - Zero-valent iron SP - 260 EP - 271 JF - Chemosphere JO - Chemosphere VL - 195 N2 - The fates of cadmium (Cd) and arsenic (As) in paddy fields are generally opposite; thus, the inconsistent transformation of Cd and As poses large challenges for their remediation. In this study, the impacts of zero valent iron (ZVI) and/or biochar amendments on Cd and As bioavailability were examined in pot trials with rice. Comparison with the untreated soil, both Cd and As accumulation in different rice tissues decreased significantly in the ZVI-biochar amendments and the Cd and As accumulation in rice decreased with increasing ZVI contents. In particular, the concentrations of Cd (0.15 ± 0.01 mg kg-1) and As (0.17 ± 0.01 mg kg-1) in rice grains were decreased by 93% and 61% relative to the untreated soil, respectively. A sequential extraction analysis indicated that with increasing Fe ratios in the ZVI-biochar mixtures, bioavailable Cd and As decreased, and the immobilized Cd and As increased. Furthermore, high levels of Fe, Cd, and As were detected in Fe plaque of the ZVI-biochar amendments in comparison with the single biochar or single ZVI amendments. The ZVI-biochar mixture may have a synergistic effect that simultaneously reduces Cd and As bioavailability by increasing the formation of amorphous Fe and Fe plaque for Cd and As immobilization. The single ZVI amendment significantly decreased As bioavailability, while the single biochar amendment significantly reduced the bioavailability of Cd compared with the combined amendments. Hence, using a ZVI-biochar mixture as a soil amendment could be a promising strategy for safely-utilizing Cd and As co-contaminated sites in the future. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/29272795/Simultaneous_alleviation_of_cadmium_and_arsenic_accumulation_in_rice_by_applying_zero_valent_iron_and_biochar_to_contaminated_paddy_soils_ DB - PRIME DP - Unbound Medicine ER -