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Insights into low fish mercury bioaccumulation in a mercury-contaminated reservoir, Guizhou, China 总被引:5,自引:0,他引:5
Liu B Yan H Wang C Li Q Guédron S Spangenberg JE Feng X Dominik J 《Environmental pollution (Barking, Essex : 1987)》2012,160(1):109-117
We examined Hg biogeochemistry in Baihua Reservoir, a system affected by industrial wastewater containing mercury (Hg). As expected, we found high levels of total Hg (THg, 664-7421 ng g(-1)) and monomethylmercury (MMHg, 3-21 ng g(-1)) in the surface sediments (0-10 cm). In the water column, both THg and MMHg showed strong vertical variations with higher concentrations in the anoxic layer (>4m) than in the oxic layer (0-4 m), which was most pronounced for the dissolved MMHg (p < 0.001). However, mercury levels in biota samples (mostly cyprinid fish) were one order of magnitude lower than common regulatory values (i.e. 0.3-0.5 mg kg(-1)) for human consumption. We identified three main reasons to explain the low fish Hg bioaccumulation: disconnection of the aquatic food web from the high MMHg zone, simple food web structures, and biodilution effect at the base of the food chain in this eutrophic reservoir. 相似文献
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The electronic waste (e-waste) is increasingly flooding Asia,especially China.E-waste could precipitate a growing volume of toxic input to the local environment if it was not handed properly.This makes the evaluation of environmental impact from electronics an essentially important task for the life cycle assessment (LCA) and the end-of-life management of electronic products.This study presented a quantitative investigation on the environmental performance of typical electronics.Two types of disposed mobile... 相似文献
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Huang Shaoqian Zhou Qi Gu Lianchao Wang Hongqing Zhang Guangming 《Environmental and Ecological Statistics》2020,27(1):115-149
Environmental and Ecological Statistics - To qualify niche space and niche overlap, the current methods are based on a strict assumption of the normal distribution and restrict dependence to the... 相似文献
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Yu Xiao Tao Liu Chunyuan Gu Jinghui Yu Manjree Agarwal 《Journal of environmental science and health. Part. B》2019,54(1):41-48
Fumigation is required to protect cottonseed in storage and pre-shipment from insect pests and/or microorganisms. Fumigation of cottonseed with carbon disulphide (CS2), carbonyl sulphide (COS), ethanedinitrile (C2N2), ethyl formate (EF), methyl bromide (MB) and phosphine (PH3) showed that >85% of the fumigants disappeared within 5?h of exposure. COS maintained >20?mg L–1 for 24?h. After 1?day of aeration, 75%–85% of the absorbed COS and MB and 20%–40% of the absorbed CS2, EF and PH3 were released from treated cottonseed. The fumigant residues were reduced by 80% for COS, 50% for EF or MB and 25% for CS2 after 1?day of aeration. After 13?days of aeration, fumigant residues were reduced by 95% for MB, 65% for EF, 55% for CS2 and to natural levels in the COS residue. Carbon disulphide, COS, PH3, EF and C2N2 had no effect on the germination of cottonseed, but germination was reduced to 50% by MB. COS has potential as a fumigant for control of insect pests in cottonseed because it dissipates quickly and does not negatively impact germination. On the other hand, MB appears to strongly absorb and requires an extended period for residues to dissipate, and it negatively impacts germination. 相似文献
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Gu Shiqing Kang Xiaonan Wang Lan Lichtfouse Eric Wang Chuanyi 《Environmental Chemistry Letters》2019,17(2):629-654
Environmental Chemistry Letters - Heavy metal pollution such as water contamination by Pb, Hg, Cu, Cd and Cr ions is induced by rapid urbanization and industrialization and is a major threat to... 相似文献