Trace metal variations in the shells of Ensis siliqua record pollution and environmental conditions in the sea to the west of mainland Britain.
Trace metal variations in the shells of Ensis siliqua record pollution and environmental conditions in the sea to the west of mainland Britain.
复制标题
Ensis siliqua 贝壳中的微量金属变化记录了英国大陆西部海域的污染和环境条件。
DOI：
10.1016/j.marpolbul.2005.11.003
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发表时间：
2006
影响因子：
5.8
通讯作者：
Victoria L Mann
中科院分区：
文献类型：
--
作者：
N. Pearce;Victoria L Mann
利用激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）对来自英国大陆西海岸13个地点的豆荚剃刀壳（Ensis siliqua）进行了一系列微量金属的分析，包括Zn， Cd, Pb， U, Ba， Sr和Mg。这些贝壳中的微量金属记录是20世纪90年代海水化学变化的代理记录。所分析金属的中位数浓度存在区域差异。钡浓度与海上倾倒污水污泥提高生产力有关。锶与盐度表现出局部关系，但在研究区域内没有明确的关系，相反，高Sr往往与高Ba相关，可能反映了生长速度等个体成因因素。镁在单个贝壳中表现出季节性变化，可以用来计算贝壳群的海面温度。污染物金属与已知来源有明确的区域关系，因此，高铅和高锌通常与前金属矿区（如卡迪根湾、安格尔西岛）有关，而高铅、高锌、高镉和高铀与利物浦湾的工业活动有关。目前还无法解释苏格兰北部贝壳中U值高的异常现象。在卡迪根湾和利物浦湾也可以看到铅的季节性变化，这与这些金属向海洋环境的冬季通量增加有关。这些金属的区域分布与已知的污染源和英国海岸周围海水迁移的模式是一致的。
Shells of the pod razor shell (Ensis siliqua) from 13 locations around the west coast of mainland Britain have been analysed by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) for a range of trace metals including Zn, Cd, Pb, U, Ba, Sr and Mg. The trace metal record in these shells is a proxy record for changes in seawater chemistry during the 1990s. Regional variations exist in the median concentrations of the analysed metals. Barium concentrations are related to increased productivity from sewage sludge dumping at sea. Strontium shows a local relationship to salinity, but there is no clear relationship over the study area, instead high Sr is often associated with high Ba, and may reflect ontogenetic factors such as growth rate. Magnesium shows a seasonal variation within individual shells and can be used to calculate sea surface temperatures from groups of shells. Contaminant metals show a clear regional relationship with known sources, thus high Pb and Zn are typically associated with former metal mining areas (e.g. Cardigan Bay, Anglesey), and high Pb, Zn, Cd and U are associated with industrial activity in Liverpool Bay. Anomalies such as the high U in shells from northern Scotland cannot at present be explained. A seasonal variation of Pb is also seen in Cardigan Bay and Liverpool Bay, relating to increased winter fluxes of these metals to the marine environment. The regional distribution of these metals is consistent with known sources of contamination and patterns of seawater migration around the coast of Britain.