甲基汞
Mercury(编程语言)
环境化学
水田
生物利用度
土壤水分
硫化物
环境修复
生物地球化学循环
化学
污染
农学
环境科学
生物累积
土壤科学
生态学
生物
有机化学
程序设计语言
生物信息学
计算机科学
作者
Hong Li,Yunyun Li,Wenli Tang,Yunpeng Liu,Lirong Zheng,Nan Xu,Yufeng Li,Defu Xu,Yang Gao
标识
DOI:10.1016/j.jhazmat.2021.127394
摘要
Mercury sulfide (HgS) constitutes the largest Hg reservoir in the lithosphere but has long been considered to be not bioavailable and a minor participant in Hg biogeochemical cycling. Herein, we report that bulk α-HgS can be dissolved and methylated in paddy soils, especially with rice culture. Bulk α-HgS exposure did not affect rice growth compared to the control group but significantly increased methylmercury (MeHg) contents in the rhizospheric soils (e.g., 80.15% and 108.71% higher for bulk α-HgS treatment vs. control at the seedling and maturation stages, respectively). Moreover, bulk α-HgS exposure induced an apparent accumulation of MeHg (50% higher for bulk α-HgS treatment vs. control) and markedly elevated total Hg (THg) in rice grains. The presence of DOM and reduced sulfide in paddy soils was further evidenced to drive the mobilization and dissolution of bulk α-HgS, thereby resulting in THg and MeHg accumulation in rice grains. These findings highlight the bioavailability of HgS in rice paddies and suggest that bulk HgS should be considered when assessing Hg health risks and developing efficient remediation approaches in Hg-contaminated croplands.
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