DOI: 10.1038/s41561-020-0533-1
论文题名: Thiolated arsenic species observed in rice paddy pore waters
作者: Wang J. ; Kerl C.F. ; Hu P. ; Martin M. ; Mu T. ; Brüggenwirth L. ; Wu G. ; Said-Pullicino D. ; Romani M. ; Wu L. ; Planer-Friedrich B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 4 起始页码: 282
结束页码: 287
语种: 英语
英文关键词: agricultural soil
; arsenic
; bioavailability
; cultivation
; growing season
; paddy field
; porewater
; rice
; China
; France
; Italy
英文摘要: The accumulation of carcinogenic arsenic in rice, the world’s main staple crop, represents a health threat to millions of people. The speciation of arsenic controls its mobility and bioavailability and therefore its entry into the food chain. Inorganic and methylated oxyarsenic species have been a focus of research, but arsenic characterization in the field has largely ignored thioarsenates, in which sulfur takes the place of oxygen. Here, on the basis of field, mesocosm and soil incubation studies across multiple paddy soils from rice cultivation areas in Italy, France and China, we find that thioarsenates are important arsenic species in paddy-soil pore waters. We observed thioarsenates throughout the cropping season, with concentrations comparable to the much-better-investigated methylated oxyarsenates. Anaerobic soil incubations confirmed a large potential for thiolation across a wide diversity of paddy soil types in different climate zones and with different parent materials. In these incubations, inorganic thioarsenates occurred predominantly where soil pH exceeded 6.5 and in the presence of zero-valent sulfur. Methylated thioarsenates occurred predominantly at soil pH below 7 and in the presence of their precursors, methylated oxyarsenates. High concentrations of dissolved iron limited arsenic thiolation. Sulfate fertilization increased thioarsenate formation. It is currently unclear whether thiolation is good or bad for rice consumption safety. Nevertheless, we highlight thiolation as an important factor to arsenic biogeochemistry in rice paddies. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169694
Appears in Collections: 气候变化与战略
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作者单位: Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China; Department of Agriculture, Forest and Food Sciences, University of Turin, Turin, Italy; Rice Research Centre, Ente Nazionale Risi, Castello d’Agogna, Pavia, Italy
Recommended Citation:
Wang J.,Kerl C.F.,Hu P.,et al. Thiolated arsenic species observed in rice paddy pore waters[J]. Nature Geoscience,2020-01-01,13(4)