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首页> 外文期刊>Estuarine Coastal and Shelf Science >Benthic flux measurements of Hg species in a northern Adriatic lagoon environment (Marano and Grado Lagoon, Italy)
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Benthic flux measurements of Hg species in a northern Adriatic lagoon environment (Marano and Grado Lagoon, Italy)

机译：北部亚得里亚泻湖环境（意大利马拉诺和格拉多泻湖）中汞物种的底栖通量测量

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摘要

As part of the "MIRACLE" project, the biogeochemical cycling of mercury (Hg) at the sediment-water interface was studied in the field in the Marano and Grado Lagoon (Northern Adriatic Sea). Seasonal investigations were conducted at selected experimental sites, where Manila Clams (Tapes philippinarum) were previously seeded. Measurements were performed seasonally during three campaigns, using two benthic chambers, one transparent and one dark, to evaluate the effect of light on Hg cycling. Total dissolved Hg (THg), methylmercury (MeHg), and dissolved gaseous Hg (DGM) species were considered. Diurnal benthic fluxes were found to significantly exceed the diffusive fluxes at all stations. The assessment of the annual recycling of Hg species from sediments to the water column showed that up to 99% of MeHg is recycled annually to the water column, while Hg recycling ranges from 30 to 60%. MeHg poses the higher risk for potential bioaccumulation in clams, but it is partially mitigated by Hg reduction, which seems to be an important process leading to evasion losses of Hg from these environments. Estimated benthic fluxes suggest that Hg recycling at the sediment-water interface is more active in the Grado sector. Hence, based on the estimated release of MeHg from sediments, it is suggested that the western sector seems to be more suitable for clam farming and the extension of rearing activities.
机译：作为“ MIRACLE”项目的一部分，在Marano和Grado泻湖（北亚得里亚海）的田间研究了沉积物-水界面处汞（Hg）的生物地球化学循环。在选定的实验地点进行了季节性调查，之前曾在该地点播种过马尼拉蛤（Tapes philippinarum）。在三个运动期间季节性进行测量，使用两个底栖室（一个透明和一个黑暗）来评估光对汞循环的影响。考虑了总溶解汞（THg），甲基汞（MeHg）和溶解气态汞（DGM）种类。人们发现，昼间底栖通量大大超过了所有站点的扩散通量。对从沉积物到水柱的汞物种的年度循环利用的评估表明，每年有多达99％的MeHg循环至水柱，而汞的循环利用率则为30％至60％。甲基汞对蛤类的潜在生物富集构成更高的风险，但通过减少汞可以部分缓解，这似乎是导致这些环境中汞逃逸损失的重要过程。估计的底流通量表明，沉积物-水界面处的汞再循环在格拉多地区更为活跃。因此，根据估计的甲基汞从沉积物中的释放，建议西部地区似乎更适合于蛤类养殖和扩大饲养活动。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2012年第10期|p.71-84|共14页
  • 作者

    Andrea Emili; Alessandro Acquavita; Neza Koron; Stefano Covelli; Jadran Faganeli; Milena Horvat; Suzana Zizek; Vesna Fajon;

  • 作者单位

    Dipartimento di Matematica e Geosaenze, Universita di Trieste, Via Weiss 2, 34128 Trieste, Italy;

    Dipartimento di Matematica e Geosaenze, Universita di Trieste, Via Weiss 2, 34128 Trieste, Italy,Osservatorio Alto Adriatico, Agenzia Regionale per la Protezione dell'Ambiente del Friuli Venezia Giulia (ARPA-FVC), Via Cairoli 14, 33057 Palmanova, Italy;

    Marine Biological Station, National Institute of Biology, Fornace 41, 6330 Piran, Siovenia,Department of Environmental Sciences, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;

    Dipartimento di Matematica e Geosaenze, Universita di Trieste, Via Weiss 2, 34128 Trieste, Italy;

    Marine Biological Station, National Institute of Biology, Fornace 41, 6330 Piran, Siovenia;

    Department of Environmental Sciences, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;

    Department of Environmental Sciences, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;

    Department of Environmental Sciences, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;

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  • 正文语种 eng
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  • 关键词

    mercury; sediments; benthic fluxes; biogeochemistry; lagoons; sediment-water interface;

    机译：汞;沉积物底流生物地球化学泻湖沉积物-水界面;

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