Influence of soil mercury concentration and fraction on bioaccumulation process of inorganic mercury and methylmercury in rice (Oryza sativa L.)
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- 作者：Jun Zhou ; Hongyan Liu ; Buyun Du ; Lihai Shang…
- 关键词：Pot experiments ; Rice plant (Oryza sativa L.) ; Hg fractions ; Ecotoxicological risk
- 刊名：Environmental Science and Pollution Research
- 出版年：2015
- 出版时间：April 2015
- 年：2015
- 卷：22
- 期：8
- 页码：6144-6154
- 全文大小：564 KB
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- 刊物主题：Environment
Environment
Atmospheric Protection, Air Quality Control and Air Pollution
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
Industrial Pollution Prevention- 出版者：Springer Berlin / Heidelberg
- ISSN：1614-7499
文摘
Recent studies showed that rice is the major pathway for methylmercury (MeHg) exposure to inhabitants in mercury (Hg) mining areas in China. There is, therefore, a concern regarding accumulation of Hg in rice grown in soils with high Hg concentrations. A soil pot experimental study was conducted to investigate the effects of Hg-contaminated soil on the growth of rice and uptake and speciation of Hg in the rice. Our results imply that the growth of rice promotes residual fraction of Hg transforming to organic-bound fraction in soil and increased the potential risks of MeHg production. Bioaccumulation factors deceased for IHg but relatively stabilized for MeHg with soil total mercury (THg) increasing. IHg in soil was the major source of Hg in the root and stalk, but leaf was contributed by Hg from both atmosphere and soil. Soluble and exchangeable Hg fraction can predict the bioavailability of IHg and MeHg in soils, and that can provide quantitative description of the rate of uptake of the bioavailable Hg. Soluble and exchangeable Hg fraction in paddy soil exceeding 0.0087?mg?kg? may cause THg concentration in rice grain above the permissible limit standard, and MeHg concentration in paddy soil more than 0.0091?mg?kg? may have the health risks to humans.