Lafabrie C, Pergent G, Pergent-Martini C
University of Corsica, Faculty of Sciences, Equipe Ecosystèmes Littoraux, BP 52, 20250 Corte, France.
Sci Total Environ. 2009 Mar 15;407(7):2440-6. doi: 10.1016/j.scitotenv.2008.11.001. Epub 2008 Dec 10.
Metal concentrations have been measured in blades of the endemic Mediterranean seagrass Posidonia oceanica, along transects from three different contaminant point sources (the former asbestos mine of Canari - Corsica, France; the chemical plant of Solvay/Rosignano - Livorno, Italy; and the industrial harbour of Porto-Torres - Sardinia, Italy). The aim of this study was to evaluate the spatial extent of the impact of these sources in terms of metal contamination. The results showed that metal contamination from the former mine of Canari (cobalt - Co, chromium - Cr and nickel - Ni) extends at least 5 km to the north and south. The impact of this mine, which closed in 1965, seems to be lingering still. Mercury (Hg) contamination in the Livorno location was difficult to evaluate due to the presence of others potential sources of mercury in the area (e.g. industrialized city of Livorno, natural cinnabar deposits, intense tectonic activity of the area). At any rate, mercury concentration decreased strongly with distance from the plant. Lead (Pb) contamination at the Porto-Torres harbour was very low and disappeared with distance from the harbour. However, as the Porto-Torres harbour does not appear as a substantial point source of Pb contamination and because of the ubiquitous characteristic of the Pb element, it is difficult to draw any general conclusions concerning this element. The results presented in this study demonstrated the usefulness of the seagrass P. oceanica as a tool for the evaluation of the spatial extent of metal contaminations from point sources and could, therefore, contribute to on-going efforts to manage coastal environments.
已对地中海特有海草波喜荡草（Posidonia oceanica）的叶片中的金属浓度进行了测量，测量沿着来自三个不同污染物点源的样带进行（法国卡纳里 - 科西嘉的前石棉矿；意大利索尔维/罗西尼亚诺 - 里窝那的化工厂；以及意大利撒丁岛托雷斯港的工业港）。本研究的目的是评估这些源在金属污染方面影响的空间范围。结果表明，来自卡纳里前矿的金属污染（钴 - Co、铬 - Cr 和镍 - Ni）向北和向南至少延伸了5公里。这座于1965年关闭的矿的影响似乎仍在持续。由于该地区存在其他潜在汞源（例如工业化城市里窝那、天然朱砂矿床、该地区强烈的构造活动），里窝那地区的汞（Hg）污染难以评估。无论如何，汞浓度随着与工厂距离的增加而大幅下降。托雷斯港的铅（Pb）污染非常低，并且随着与港口距离的增加而消失。然而，由于托雷斯港似乎并非铅污染的主要点源，且由于铅元素具有普遍存在的特性，因此很难就该元素得出任何一般性结论。本研究给出的结果证明了海草波喜荡草作为评估点源金属污染空间范围工具的有用性，因此有助于正在进行的沿海环境管理工作。
