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Mass Balance for Mercury in the San Francisco Bay Area

机译：旧金山湾区汞的质量平衡

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摘要

We have developed and illustrated a general regional multi-species model that describes the fate and transport of mercury in three forms, elemental, divalent, and methylated, in a generic regional environment including air, soil, vegetation, water, and sediment. The objectives of the model are to describe the fate of the three forms of mercury in the environment and to determine the dominant physical sinks that remove mercury from the system. Chemical transformations between the three groups of mercury species are modeled by assuming constant ratios of species concentrations in individual environmental media. We illustrate and evaluate the model with an application to describe the fate and transport of mercury in the San Francisco Bay Area of California. The model successfully rationalizes the identified sources with observed concentrations of total mercury and methyl mercury in the San Francisco Bay Estuary. The mass balance provided by the model indicates that continental and global background sources control mercury concentrations in the atmosphere but that loadings to water in the San Francisco Bay Estuary are dominated by runoff from the Central Valley catchment and remobilization of contaminated sediments deposited during past mining activities. The model suggests that the response time of mercury concentrations in the San Francisco Bay Estuary to changes in loadings is long, on the order of 50 years.
机译：我们已经开发并说明了一个通用的区域多物种模型，该模型描述了在包括空气，土壤，植被，水和沉积物的一般区域环境中，汞以元素，二价和甲基化三种形式发生的命运和运输。该模型的目的是描述环境中三种形式的汞的命运，并确定从系统中去除汞的主要物理汇。通过假设各个环境介质中物种浓度的恒定比率来模拟三类汞物种之间的化学转化。我们通过描述加利福尼亚州旧金山湾地区汞的命运和运输的应用程序来说明和评估该模型。该模型通过在旧金山湾河口中观测到的总汞和甲基汞浓度，成功地合理化了已识别的来源。该模型提供的质量平衡表明，大陆和全球背景源控制了大气中的汞浓度，但旧金山湾河口的水负荷主要来自中央谷地集水区的径流和过去采矿活动中沉积的受污染沉积物的迁移。 。该模型表明，旧金山湾河口中汞浓度对负荷变化的响应时间很长，大约为50年。

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  • 来源
    《Environmental Science & Technology》 |2005年第17期|p.6721-6729|共9页
  • 作者

    MATTHEW MACLEOD; THOMAS E. MCKONE; DON MACKAY;

  • 作者单位

    Lawrence Berkeley National Laboratory, One Cyclotron Road, 90R3058, Berkeley, California 94720;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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