The Historical Record of Metals in Sediments from Six Lakes in the Fraser River Basin, British Columbia
The Historical Record of Metals in Sediments from Six Lakes in the Fraser River Basin, British Columbia
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不列颠哥伦比亚省弗雷泽河流域六个湖泊沉积物中金属的历史记录
DOI：
10.1023/b:wate.0000015349.25371.af
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
D. Paton
中科院分区：
文献类型：
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作者：
L. Gallagher;R. Macdonald;D. Paton
从分布于不列颠哥伦比亚省弗雷泽河流域的六湖（穆斯湖、斯图尔特湖、奇尔科湖、坎卢普斯湖、尼古拉湖和哈里森湖）采集沉积物岩心。岩心的年龄主要来自210 Pb剖面，并通过计数纹层和使用137 Cs作为离散时间标记来证实。对岩心进行了一系列金属（Co、Cr、Cu、Hg、Ni、Mn、Pb和Zn）和有机碳分析。这些数据是在1900年后弗雷泽河流域金属污染的背景下进行评估的。总体而言，从弗雷泽盆地的湖泊沉积物中的金属污染保持相对原始，表现出只有轻微的金属富集层从工业时代（1900年后）。斯图尔特湖，收到汞污染的地雷对平奇湖，显示了明确的污染汞信号。在所研究的六湖中，有五个湖泊的铅污染无处不在。铅富集是轻微的（范围从8.4至30.9微克g-1），并与当地汽车排放的含铅汽油的使用可能会增加从工业和市政中心沿沿着西海岸的长途运输。最大的铅通量观察到在坎卢普斯，驼鹿和哈里森湖，其中每一个都有一条高速公路或一个大的城市中心作为当地的铅源。这种流域规模的评价提供了一个独特的机会，比较当地和区域污染源的相对重要性。
Sediment cores were collected from six lakes (Moose, Stuart, Chilko, Kamloops, Nicola and Harrison Lakes) distributed throughout the Fraser River Basin, British Columbia. The cores were dated primarily from210Pb profiles and dating was corroborated by counting laminae and by using137Cs as a discrete time marker. The cores were analyzed for a suite of metals (Co, Cr, Cu, Hg, Ni, Mn, Pb and Zn) and organic carbon. The data were evaluated in the context of post-1900 contamination by metals in the Fraser River basin. Overall, lake sediments from the Fraser Basin remain relatively pristine in terms of metal contamination, exhibiting only minor metal enrichments in layers dating from industrial times (post-1900). Stuart Lake, which received Hg contamination from a mine on Pinchi Lake, shows a clear contaminant Hg signal. Pb exhibits ubiquitous contamination in five of the six lakes studied. The Pb enrichments are minor (ranging from 8.4 to 30.9 μg g-1) and consistent with local automotive emissions from the use of leaded gasoline possibly augmented by long-range transport from industrial and municipal centers along the west coast. The largest Pb fluxes were observed in Kamloops, Moose and Harrison Lakes, each of which has either a highway or a large urban centre as a local source of Pb. This watershed-scale evaluation offers a unique opportunity to compare the relative importance of local and regional sources of contamination.