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首页> 外文期刊>Environmental Science & Technology >Submarine Groundwater Discharge of Total Mercury and Monomethylmercury to Central California Coastal Waters
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Submarine Groundwater Discharge of Total Mercury and Monomethylmercury to Central California Coastal Waters

机译：向加利福尼亚中部沿海水域排放总汞和一甲基汞的海底地下水

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摘要

Fluxes of total mercury (Hg_T) and monomethylmercury (MMHg) associated with submarine groundwater discharge (SGD) at two sites on the central California coast were estimated by combining measurements of Hg_T and MMHg in groundwater with the use of short-lived, naturally occurring radium isotopes as tracers of groundwater inputs. Concentrations of Hg_T were relatively low, ranging from 1.2 to 28.3 pM in filtered groundwater, 0.8 to 11.6 pM in filtered surface waters, and 2.5 to 12.9 pM in unfiltered surface waters. Concentrations of MMHg ranged from <0.04 to 3.1 pM in filtered groundwater, <0.04 to 0.53 pM in filtered surface waters, and 0.07 to 1.2 pM in unfiltered surface waters. Multiple linear regression analysis identified significant (p < 0.05) positive correlations between dissolved groundwater concentrations of Hg_T and those of NH_4~-and SiO_2, and between dissolved groundwater concentrations of MMHg and those of Hg_T and NH_4~+. However, such relationships did not account for the majority of the variability in concentration data for either mercury species in groundwater. Fluxes of Hg_T via SGD were estimated to be 250 ± 160 nmol day~(-1) m~(-1) of shoreline at Stinson Beach and 3.0 ± 2.0 nmol m~(-2) day~(-1) at Elkhorn Slough. These Hg_T fluxes are substantially greater than net atmospheric inputs of Hg_T reported for waters in nearby San Francisco Bay. Calculated fluxes of MMHg to coastal waters via SGD were 10 ± 12 nmol day~(-1) m~(-1) of shoreline at Stinson Beach and 0.24 ± 0.21 nmol m~(-2) day~(-1) at Elkhorn Slough. These MMHg fluxes are similarto benthic fluxes of MMHg out of surface sediments commonly reported for estuarinernand coastal environments. Consequently, this work demonstrates that SGD is an important source of both Hg_T and MMHg to coastal waters along the central California coast.
机译：通过结合对地下水中Hg_T和MMHg的测量以及使用短寿命的天然镭的测量，估算了加利福尼亚中部沿海两个地点与海底地下水排放（SGD）相关的总汞（Hg_T）和一甲基汞（MMHg）的通量同位素作为地下水输入的示踪剂。 Hg_T的浓度相对较低，在过滤后的地下水中为1.2至28.3 pM，在过滤后的地表水中为0.8至11.6 pM，在未过滤的地表水中为2.5至12.9 pM。在过滤的地下水中，MMHg的浓度范围为<0.04至3.1 pM，在过滤的地表水中的浓度为<0.04至0.53 pM，而在未过滤的地表水中的浓度为0.07至1.2 pM。多元线性回归分析表明，Hg_T的溶解地下水浓度与NH_4〜-和SiO_2的溶解地下水浓度之间，MMHg的溶解地下水的浓度与Hg_T和NH_4〜+的溶解地下水浓度之间存在显着（p <0.05）正相关。但是，这种关系并不能说明地下水中任何一种汞物种的浓度数据的大部分可变性。 Hg_T通过SGD的通量估计为Stinson Beach的海岸线为250±160 nmol·m-1（-1）m〜（-1）和Elkhorn Slough的为3.0±2.0 nmol·m〜（-2）day〜（-1） 。这些Hg_T通量显着大于附近旧金山湾水域报告的Hg_T净大气输入。通过SGD计算得出的MMHg向沿海水域的通量为Stinson Beach海岸线的10±12 nmol·m-1（-1）m〜（-1）和Elkhorn海岸的0.24±0.21 nmol·m-2（-2）day〜（-1）烂这些MMHg通量与河口和沿海环境通常报道的地表沉积物中MMHg底栖通量相似。因此，这项工作表明，SGD是加利福尼亚中部沿海沿海地区Hg_T和MMHg的重要来源。

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  • 来源
    《Environmental Science & Technology》 |2009年第15期|5652-5659|共8页
  • 作者

    FRANK J . BLACK; ADINA PAYTAN; KAREN L. KNEE; NICHOLAS R. DE SIEYES; PRIYA M. GANGULI; ELLEN GRAY; A. RUSSELL FLEGAL;

  • 作者单位

    WIGS Laboratory, Department of Environmental Toxicology, University of California, Santa Cruz, California 95061 Department of Geosciences, Princeton University, Princeton, New Jersey 08544;

    Institute of Marine Sciences, University of California, Santa Cruz, California 95061;

    Institute of Marine Sciences, University of California, Santa Cruz, California 95061 Department of Geological & Enviromnental Sciences, Stanford University, Stanford, California 94305-2115;

    Department of Geological & Enviromnental Sciences, Stanford University, Stanford, California 94305-2115;

    Institute of Marine Sciences, University of California, Santa Cruz, California 95061;

    Institute of Marine Sciences, University of California, Santa Cruz, California 95061;

    WIGS Laboratory, Department of Environmental Toxicology, University of California, Santa Cruz, California 95061;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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