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首页> 外文期刊>Environmental Science & Technology >Determining Air-Water Exchange, Spatial and Temporal Trends of Freely Dissolved PAHs in an Urban Estuary Using Passive Polyethylene Samplers
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Determining Air-Water Exchange, Spatial and Temporal Trends of Freely Dissolved PAHs in an Urban Estuary Using Passive Polyethylene Samplers

机译：使用被动式聚乙烯采样器测定城市河口中自由溶解的PAHs的空气-水交换，时空趋势

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摘要

Passive polyethylene (PE) samplers were deployed at six locations within Narragansett Bay (RI, USA) to determine sources and trends of freely dissolved and gas-phase polycydic aromatic hydrocarbons (PAHs) from May to November 2006. Freely dissolved aqueous concentrations of PAHs were dominated by fluoranthene, pyrene, and phenanthrene, at concentrations ranging from tens to thousands of pg/L. These were also die dominant PAHs in the gas phase, at hundreds to thousands of pg/m . All stations mostly followed the same temporal trends, with highest concentrations (up to 7300 pg/L for sum PAHs) during the second of 11 deployments, coinciding with a major rainstorm. Strong correlations of sum PAHs with river flows and wastewater treatment plant discharges highlighted the importance of rainfall in mobilizing PAHs from a combination of runoff and atmospheric washout. PAH concentrations declined through consecutive deployments III to V, which could be explained by an exponential decay due to flushing with cleaner ocean water during tides. The estimated residence time (frcs) of the PAH pulse was 24 days, close to an earlier estimate of ^ of 16 days for freshwater in the Bay. Air-water exchange gradients indicated net volatilization of most PAHs closest to Providence. Further south in the Bay, gradients had changed to mostly net uptake of the more volatile PAHs, but net volatilization for the less volatile PAHs. Based on characteristic PAH ratios, freely dissolved PAHs at most sites originated from the combustion of fossil fuels; only two sites were at times affected by fuel spill-derived PAHs.
机译：在2006年5月至11月间，将无源聚乙烯（PE）采样器部署在Narragansett湾（美国里约热内卢）的六个位置，以确定自由溶解的和气相的多环芳烃（PAHs）的来源和趋势。以荧蒽，pyr和菲为主，浓度范围为数十至数千pg / L。这些也是气相中占主导地位的PAH，数百至数千pg / m。所有站都遵循相同的时间趋势，在11次部署中的第二次部署期间，浓度最高（PAH总量最高为7300 pg / L），这与一场大暴雨相吻合。总多环芳烃与河流流量和污水处理厂排放之间的密切相关性突出了降雨在调集径流和大气冲刷作用中多环芳烃方面的重要性。通过连续部署III至V，PAH浓度下降，这可以用潮汐期间用较干净的海水冲洗导致的指数衰减来解释。 PAH脉冲的估计停留时间（frcs）为24天，接近先前对海湾淡水的16天^的估计。空气-水交换梯度表明，最接近普罗维登斯（Providence）的大多数PAH的净挥发度。在海湾的更南端，梯度已改变为大部分挥发性较高的PAH的净吸收量，但挥发性较低的PAH的净挥发量。根据特征性PAH比率，大多数站点中自由溶解的PAHs源自化石燃料的燃烧。有时只有两个站点受到燃油泄漏衍生的PAH的影响。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2655-2662|共8页
  • 作者

    Rainer Lohmann; Meredith Dapsis; Eric J. Morgan; Victoria Dekany; Pamela J. Luey;

  • 作者单位

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, United States;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, United States;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, United States;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, United States;

    Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882, United States;

  • 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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