Understanding the paradox of selenium contamination in mercury mining areas

high soil content and low accumulation in rice

Hua Zhang, Xinbin Feng*, Chengxin Jiang, Qiuhua Li, Yi Liu, Chunhao Gu, Lihai Shang, Ping Li, Yan Lin, Thorjørn Larssen

*Corresponding author for this work

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Rice is an important source of Se for billions of people throughout the world. The Wanshan area can be categorized as a seleniferous region due to its high soil Se content, but the Se content in the rice in Wanshan is much lower than that from typical seleniferous regions with an equivalent soil Se level. To investigate why the Se bioaccumulation in Wanshan is low, we measured the soil Se speciation using a sequential partial dissolution technique. The results demonstrated that the bioavailable species only accounted for a small proportion of the total Se in the soils from Wanshan, a much lower quantity than that found in the seleniferous regions. The potential mechanisms may be associated with the existence of Hg contamination, which is likely related to the formation of an inert Hg-Se insoluble precipitate in soils in Wanshan.

Original languageEnglish
Pages (from-to)27-36
Number of pages10
JournalEnvironmental Pollution
Volume188
DOIs
Publication statusPublished - May 2014
Externally publishedYes

Keywords

  • Bioaccumulation
  • Food consumption
  • Mercury mining areas
  • Soil selenium contamination
  • Sequential partial dissolution

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