Journal
ENVIRONMENTAL POLLUTION
Volume 188, Issue -, Pages 27-36Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2014.01.012
Keywords
Bioaccumulation; Food consumption; Mercury mining areas; Soil selenium contamination; Sequential partial dissolution
Categories
Funding
- 973 Program [2013CB430003]
- Natural Science Foundation of China [41203092, 41373135]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
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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. (C) 2014 Elsevier Ltd. All rights reserved.
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