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Decreased bioavailability of both inorganic mercury and methylmercury in anaerobic sediments by sorption on iron sulfide nanoparticles
Xiang, Yuping; Zhu, Ailing; Guo, Yingying; Liu, Guangliang; Chen, Baowei; He, Bin; Liang, Yong; Yin, Yongguang; Cai, Yong; Jiang, Guibin
2022
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
Volume424Issue:0Pages:127399
Abstract

Methylmercury (MeHg), derived via inorganic mercury (Hg(II)) methylation by anaerobic microorganisms, is a neurotoxic contaminant causing concern worldwide. Establishing how to reduce Hg(II) methylation and MeHg bioavailability is essential for effective control of Hg pollution. Iron sulfide nanoparticles (FeSNp) is a promising passivator for Hg(II) methylation. However, its effect on the fate of MeHg in aquatic systems remains poorly understood. This study investigated the effect of FeSNP on Hg(II) bioavailability, MeHg production and bioavailability in aquatic environments. Results demonstrated that FeSNP rapidly sorbed Hg(II) and MeHg, with sorption affected by pH, chloride ion and dissolved organic matter. Hg-specific biosensor analysis showed that Hg(II) sorbed onto FeSNP significantly reduced its bioavailability to microorganisms. Double stable isotope (Hg-199(II) and (MeHg)-Hg-201) addition revealed that FeSNP significantly inhibited MeHg production in anaerobic sediments. Furthermore, synthetic gut juice extraction suggested that FeS(NP )decrease concentrations of bioavailable MeHg and Hg(II), reducing their integration into food webs. However, the sorbed MeHg and Hg(II) in sediments can be released after FeSNP oxidation, potentially enhancing the risk of exposure to aquatic organisms. Overall, these findings increase our understanding of Hg transformation and exposure risks in aquatic systems, providing valuable information for the development of in situ Hg remediation systems.

Department环境纳米技术与健康效应重点实验室
KeywordIron sulfide nanoparticles Mercury Methylmercury Sorption Bioavailability
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46950
Collection环境纳米技术与健康效应重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Lab Environm Nanotechnol & Hlth Effect, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Florida Int Univ, Dept Chem & Biochem, 11200 SW 8th ST, Miami, FL 33199 USA
5.Florida Int Univ, Southeast Environm Res Ctr, 11200 SW 8th ST, Miami, FL 33199 USA
6.Sun Yat Sen Univ, Sch Marine Sci, Southern Marine Sci & Engn Guangdong Lab, Zhuhai 519082, Peoples R China
7.Jianghan Univ, Inst Environm & Hlth, Wuhan 430056, Peoples R China
8.UCAS, Hangzhou Inst Adv Study, Inst Environm & Hlth, Hangzhou 310024, Peoples R China
Recommended Citation
GB/T 7714
Xiang, Yuping,Zhu, Ailing,Guo, Yingying,et al. Decreased bioavailability of both inorganic mercury and methylmercury in anaerobic sediments by sorption on iron sulfide nanoparticles[J]. JOURNAL OF HAZARDOUS MATERIALS,2022,424(0):127399.
APA Xiang, Yuping.,Zhu, Ailing.,Guo, Yingying.,Liu, Guangliang.,Chen, Baowei.,...&Jiang, Guibin.(2022).Decreased bioavailability of both inorganic mercury and methylmercury in anaerobic sediments by sorption on iron sulfide nanoparticles.JOURNAL OF HAZARDOUS MATERIALS,424(0),127399.
MLA Xiang, Yuping,et al."Decreased bioavailability of both inorganic mercury and methylmercury in anaerobic sediments by sorption on iron sulfide nanoparticles".JOURNAL OF HAZARDOUS MATERIALS 424.0(2022):127399.
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