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Effects of soil properties on production and bioaccumulation of methylmercury in rice paddies at a mercury mining area,China

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Journal of Environmental Sciences 2018年第6期30卷 194-205页

作者： Deliang Yin Tianrong He Runsheng Yin Lingxia Zeng The Key Laboratory of Karst Environment and Geohazard Prevention Guizhou University Guiyang 550003 China College of Resources and Environments Southwest University Chongqing 400715 China State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Department of Civil and Environmental Engineering Environmental Chemistry and Technology Program University of Wisconsin-Madison Madison WI 53706 USA

Rice paddy soil is recognized as the hotspot of mercury（Hg） methylation, which is mainly a biotic process mediated by many abiotic factors. In this study, effects of key soil properties on the production and bioaccumulation of Hg and methylmercury（MeHg） in Hg-contaminated rice paddies were investigated. Rice and soil samples were collected from the active Hg smelting site and abandoned Hg mining sites（a total of 124 paddy fields） in the Wanshan Mercury Mine, China. Total Hg（THg） and MeHg in soils and rice grains, together with sulfur（S）,selenium（Se）, organic matter（OM）, nitrogen（N）, phosphorus（P）, mineral compositions（e.g., SiO2, Al2O3 and Fe2O3） and pH in soils were quantified. The results showed that long-term Hg mining activities had resulted in THg and MeHg contaminations in soil-rice system. The newly-deposited atmospheric Hg was more readily methylated relative to the native Hg already in soils, which could be responsible for the elevated MeHg levels in soils and rice grains around the active artificial Hg smelting site. The MeHg concentrations in soils and rice grains showed a significantly negative relationship with soil N/Hg, S/Hg and OM/Hg ratio possibly due to the formation of low-bioavailability Hg–S（N）–OM complexes in rhizosphere. The Hg–Se antagonism undoubtedly occurred in soil-rice system, while its role in bioaccumulation of MeHg in the MeHg-contaminated rice paddies was minor. However, other soil properties showed less influence on the production and bioaccumulation of MeHg in rice paddies located at the Wanshan Mercury Mine zone.

关键词： Rice paddy Physicochemical property Mercury mining area Mercury Methylmercury bioaccumulation factors

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A survey of arsenic and other heavy metals in vegetation from markets or mine tailings

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Journal of Environmental Sciences 2006年第2期18卷 287-291页

作者： LIU Wen-ju Kim Kyoung-woong ZHU Yong-guan LEE Sang-woo CHANG Pei-chun Kwak Ji-hyun Department of Environmental Science and Engineering Gwangju Institute of Science and Technology （GIST） Gwangju 500-712 Korea Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China College of Natural Resources and Environment Hebei Agricultural University Baoding 071001 China

This research includes two investigations. The first one is a market basket survey of the levels of arsenic （As） and trace elements in bracken fern （Pteridium aquilinum） originated from three countries： South Korea, China and North Korea. The results showed that the mean As concentrations in stems of samples were significantly higher than those in leaves. As concentrations in all samples did not exceed food safety limits for vegetables. Generally, concentrations of Fe, Mn, Cu and Zn in leaves were higher than those in stems. The second investigation is a survey on the levels of As and other heavy metals in vegetation in the vicinity of Myoungbong mine tailings. The results demonstrated that As, Pb and Cu concentrations and bioaccumulation factors （BCF） in seedlings of the fern（A splenium achilleifolium） were the highest, whereas Marsh horsetail（Equisetum polustre） accumulated the highest levels of Zn. Concentrations of As, Pb, Zn and Cu in vegetable-cress （Lepidium sativum） and the edible herb-aromatic madder （Elasholtzia splendens） were higher than food safety limits. Therefore, a risk assessment of As and other heavy metals in vegetables and herbs on local human health should be conducted in the future.

关键词： arsenic heavy metals ferns bioaccumulation factors

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Heavy metal distribution of natural and reclaimed tidal riparian wetlands in south estuary, China

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Journal of Environmental Sciences 2011年第12期23卷 1937-1946页

作者： Honggang Zhang Baoshan Cui Kejiang Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Department of Civil Engineering University of Calgary Calgary AB Canada

We evaluated the distribution and accumulation of Cd, Cr, Cu, Ni, Pb and Zn in two plant species （Scirpus tripueter Linn. and Cyperus malaccensis Lam.）, in water and soils sampled from the reclaimed tidal riparian wetlands （RTRWs） and the natural riparian wetlands （NRWs） in the Pearl River Estuary （PRE）. The results showed that the concentrations of studied heavy metals in soils exceeded the eco-toxic threshold recommended by US EPA. The concentrations of Cd, Cr and Zn in plants may lead to toxic effiects. The heavy metal concentrations were high in water and low in soils of RTRWs compared with that in the NRWs. The accumulation of heavy metals in the roots of plants was higher in NRWs than those in RTRWs while the opposite result was found for heavy metal accumulation in shoots. Based on the bioaccumulation and translocation factors, the plants in NRWs had a higher capacity to accumulate heavy metals while higher abilities to transport heavy metals from roots to shoots were observed in RTRWs. Heavy metal contaminations in RTRWs were dominated by anthropogenic sources from both side uplands and river water, whereas in NRWs, the metal accumulations were simultaneously affected by anthropogenic and natural factors

关键词： reclaimed tidal riparian wetlands heavy metals bioaccumulation factors translocation factors Pearl River Estuary

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