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引用本文:何天容,吴玉勇,冯新斌.富营养化对贵州红枫湖水库汞形态和分布特征的影响.湖泊科学,2010,22(2):208-214. DOI:10.18307/2010.0209
HE Tianrong,WU Yuyong,FENG Xinbin.The impact of eutrophication on distribution and speciation of mercury in Hongfeng Reservoir, Guizhou Province. J. Lake Sci.2010,22(2):208-214. DOI:10.18307/2010.0209
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富营养化对贵州红枫湖水库汞形态和分布特征的影响
何天容1, 吴玉勇2, 冯新斌3
1.贵州大学喀斯特环境与地质灾害防治教育部重点实验室, 贵阳 550003;2.贵州大学资源与环境工程学院, 贵阳 550003;3.中国科学院地球化学研究所, 环境地球化学国家重点研究实验室, 贵阳 550002
摘要:
通过对贵州省红枫湖水库中各种汞形态的空间分布及季节变化的研究,探讨了富营养化对各种汞形态分布特征的影响.红枫湖湖水总汞浓度在2.5-13.9ng/L之间,平均值为6.9ng/L.红枫湖水库中汞浓度的空间分布和季节变化均严重受到人为汞污染源的干扰.水体中汞在颗粒态和溶解态之间的分配,主要受内源有机质以及氧化还原条件的影响.由于水华现象,春季后五采样点大量繁殖的藻类吸附了大量的汞,从而改变了汞在水库中的分配和迁移.藻类的生长对水体中溶解气态汞浓度分布也有显著的影响.在夏季,总甲基汞和溶解态甲基汞在水体中的垂直分布表明:在富营养化较严重的后五采样点,水体中升高的甲基汞主要是由于水体中汞的甲基化过程;而在富营养化特征不明显的大坝,水体中升高的甲基汞主要来自沉积物甲基汞的释放.红枫湖水体中各种汞形态的分布特征表明,富营养化对汞的迁移转化影响显著,尤其是汞的甲基化过程.水体富营养化为汞的甲基化提供了有利条件,给水生生态环境及人体健康带来了潜在的威胁.
关键词:  汞形态  甲基汞  富营养化  红枫湖水库
DOI:10.18307/2010.0209
分类号:
基金项目:贵州省科学技术基金(黔科合J字[2008]2234);贵州大学人才引进项目(贵大人基合字(2007)048号)联合资助
The impact of eutrophication on distribution and speciation of mercury in Hongfeng Reservoir, Guizhou Province
HE Tianrong1, WU Yuyong2, FENG Xinbin3
1.Key Laboratory of Karst Environment and Geohazard Prevention,Guizhou University,Guiyang 550003,P.R.China;2.School of Resources and Environmental Engineering,Guizhou University,Guiyang 550003,P.R.China;3.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,P.R.China
Abstract:
In the present study, seasonal distribution of mercury formation and the impact of eutrophication on the biogeochemicalcycling of the mercury were studied in Hongfng Reservoir. Total mercury concentrations in the water varied from 2.5 to l4 ng/Lwith an average concentration of 6. 9ng/L. The seasonal and spatial distribution of total mer ury could be controlled by the mercurycontaminations. The PH THg ratios were mainly regulated discharged by autochthonous organic materials and redox potential inlake water. The sampling microalgae at Houwu station in May had a large capacity to bind mercury that changed the distributions ofmercury in the reservoir. Dissolved gaseous mercury concentrations were also affected by algal activities. Methyl mercury(MeHg)in the sampling water column at a hyper-eutrophication site of Hongfng Reservoir, demonstrated that most of MeHg was producedin the hypolimnion laye. MeHg profile pattern at the second site, where there is less eutrophication, indicated that MeHg in waterwas largely ascribed to the release from sediment. The distributions of mercury in Hongfeng Reservoir showed that eutrophicationhad a significant impact on transportation and transformation of mercury, especially on methylation of mercury. Eutrophication hasaccelerated formation of methylation of mercury, which may cause serious ecosystem risks to Hongfng Reservoir.
Key words:  Mercury form  methyl mercury  eutrophication  Hongfeng Reservoir
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