Iron-oxidizing strain(FeOB)and iron modified biochars have been shown arsenic(As)reme-diation ability in the environment.However,due to the complicated soil environment,few field experiment has been conducted.The study was conducted to investigate the potential of iron modified biochar(BC-FeOS)and biomineralization by a new found FeOB to remediate As-contaminated paddy field.Compared with the control,the As contents of GB(BC-FeOS),GF(FeOB),GFN(FeOB and nitrogen fertilizer),GBF(BC-FeOS and FeOB)and GBFN(BC-FeOS,FeOB and nitrogen fertilizer)treatments in pore water decreased by 36.53％-80.03％and the microbial richness of iron-oxidizing bacteria in these treatments increased in soils at the rice maturation stage.The concentrations of available As of GB,GF,GFN,GBF and GBFN at the tillering stage were significantly decreased by 10.78％-55.48％.The concentrations of non-specifically absorbed and specifically absorbed As fractions of GB,GF,GFN,GBF and GBFN in soils were decreased and the amorphous and poorly crystalline hydrated Fe and Al oxide-bound fraction was increased.Moreover,the As contents of GB,GF,GFN,GBF and GBFN in rice grains were significantly decreased(*P＜0.05)and the total As contents of GFN,GBF and GBFN were lower than the standard limit of the National Standard for Food Safety(GB 2762-2017).Compared with the other treatments,GBFN showed the greatest potential for the effective remediation of As-contaminated paddy fields.

Kaikai Wu;Chuan Wu;Xingxing Jiang;Rui Xue;Weisong Pan;Wai-Chin Li;Xinghua Luo;Shengguo Xue

School of Metallurgy and Environment,Central South University,Changsha 410083,China;Department of Science and Environmental Studies,The Education University of Hong Kong,Administrative Region,Hong Kong,China;College of Environmental Sciences,Sichuan Agricultural University,Chengdu 611130,China;College of Bioscience and Biotechnology,Hunan Agricultural University,Changsha 410125,China

环境科学学报（英文版）

[1]Kaikai Wu;Chuan Wu;Xingxing Jiang;Rui Xue;Weisong Pan;Wai-Chin Li;Xinghua Luo;Shengguo Xue-.Remediation of arsenic-contaminated paddy field by a new iron oxidizing strain(Ochrobactrum sp.)and iron-modified biochar)[J].环境科学学报（英文版）,2022(05):411-421

FeOB,reme,FeOS,remediate,GBFN

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