@article{dbeb221484e640cf8e16073056e89f68,
title = "Pig carcass-derived biochar caused contradictory effects on arsenic mobilization in a contaminated paddy soil under fluctuating controlled redox conditions",
abstract = "Contamination of paddy soils by arsenic (As) is of great concern for human health and the environment. The impact of animal-derived biochar on As mobilization under fluctuating redox conditions in paddy soils has not been studied. Consequently, we investigated the effects of pig carcass-derived biochar (PB) on As (im)mobilization in a contaminated paddy soil under controlled redox potential (Eh) using a biogeochemical microcosm-setup. The addition of PB decreased the concentration of dissolved As at Eh = +100 and +200 mV by 38.7% and 35.4%, respectively (compared to the control), because of the co-precipitation of As with Fe-Mn oxides and the complexation between As and aromatic organic molecules. However, under reducing conditions (Eh = -300 mV), PB increased the dissolved As by 13.5% through promoting reduction and decomposition of As-bearing Fe minerals (e.g., ferrihydrite-As, Fe-humic-As). Under oxidizing conditions (Eh = +250 mV), PB increased the dissolved As by 317.6%, due to the associated increase of pH. We conclude that As mobilization in PB-treated paddy soils is highly affected by Eh. PB can be used to reduce the environmental risk of As under moderately reducing conditions, but it may increase the risk under highly reducing and oxidizing conditions in paddy soils.",
keywords = "Biochar, Hazardous metal(loid), Paddy soil contamination, Redox condition, Soil remediation",
author = "Xing Yang and Marvin Hinzmann and He Pan and Jianxu Wang and Nanthi Bolan and Tsang, {Daniel C.W.} and Ok, {Yong Sik} and Wang, {Shan Li} and Shaheen, {Sabry M.} and Hailong Wang and J{\"o}rg Rinklebe",
note = "Funding Information: This work was supported by the National Key Research and Development Program of China (2020YFC1807704), the National Natural Science Foundation of China (Grant No. 21876027), the Fundamental Research Program of Department of Science and Technology of Guizhou, China (Grant No. ZK[2021]-key-045), and the Special Fund for the Science and Technology Innovation Team of Foshan, China (Grant No.1920001000083). Authors are also grateful to the National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC and in particular Dr. Soo, Yun-Liang (TLS 07A1) and Dr. Lee, Jyh-Fu (TLS 17C1). We thank Claus Vandenhirtz and Kail Matuszak and the entire team of the Laboratory of Soil- and Groundwater-Management, University of Wuppertal, Germany, for technical assistance. Funding Information: This work was supported by the National Key Research and Development Program of China ( 2020YFC1807704 ), the National Natural Science Foundation of China (Grant No. 21876027 ), the Fundamental Research Program of Department of Science and Technology of Guizhou , China (Grant No. ZK[2021]-key-045 ), and the Special Fund for the Science and Technology Innovation Team of Foshan , China (Grant No. 1920001000083 ). Authors are also grateful to the National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC and in particular Dr. Soo, Yun-Liang (TLS 07A1) and Dr. Lee, Jyh-Fu (TLS 17C1). We thank Claus Vandenhirtz and Kail Matuszak and the entire team of the Laboratory of Soil- and Groundwater-Management, University of Wuppertal, Germany, for technical assistance. Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",
year = "2022",
month = jan,
day = "5",
doi = "10.1016/j.jhazmat.2021.126647",
language = "English",
volume = "421",
journal = "Journal of Hazardous Materials",
issn = "0304-3894",
publisher = "Elsevier B.V.",
}
