Stable Isotope and Concentration Records of Atmospheric Lead Pollution in Peat and Lake Sediments in Sweden
Stable Isotope and Concentration Records of Atmospheric Lead Pollution in Peat and Lake Sediments in Sweden
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瑞典泥炭和湖泊沉积物中大气铅污染的稳定同位素和浓度记录
DOI：
10.1023/a:1018360106350
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
I. Renberg
中科院分区：
文献类型：
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作者：
M. Brännvall;R. Bindler;O. Emteryd;M. Nilsson;I. Renberg
我们比较铅浓度和稳定的铅同位素分析，从三个泥炭沼泽和三个湖泊沉积物记录在瑞典。放射性碳年代地层学提供的证据表明，铅的浓度在泥炭和沉积物芯的趋势是非常相似的，并遵循的总体轮廓的历史全球铅生产超过几千年。由于206 Pb/207 Pb比值在瑞典（约1.5）和欧洲大陆（不包括芬诺斯堪的纳维亚）（≤1.2）之间存在很大差异，因此可以区分瑞典的Pb外部来源。在湖泊沉积物中，206 Pb/207 Pb比值的剖面反映了1000 AD之前的Pb浓度;浓度增加伴随着比值的降低。公元1000年后，由于污染物Pb几乎完全占主导地位，沉积物中的比值变化不大，约为1.2。在本世纪，由于汽油中烷基铅的加入，铅的比值进一步下降到1.14左右。在沼泽地向沼泽地过渡的过程中，206 Pb/207 Pb比值从>1.3迅速下降到约1.2，并且该比值持续下降到现在。我们假设，这是因为外部衍生的铅从土壤灰尘和大气污染的远程运输一直是更重要的，在湿地泥炭比湖泊，有更大的流入流域衍生的铅。
We compare lead concentration and stable lead isotope analyses from three peat bog and three lake sediment records in Sweden. Radiocarbon dated stratigraphies give evidence that trends in the concentration of Pb in the peat and sediment cores are very similar, and follow the general outline of historical global Pb production over several thousand years. Due to the large difference in the 206Pb/207Pb ratio between Sweden, about 1.5, and continental Europe (excluding Fennoscandia), ≤1.2, it is possible to distinguish external sources of Pb to Sweden. In the lake sediments, profiles of 206Pb/207Pb ratio mirror the Pb concentration until 1000 AD; increasing concentration is accompanied by decreasing ratios. After 1000 AD the ratio varies little at about 1.2 in sediments, because of the near total dominance of pollutant Pb. There is a further decline in the Pb ratio to about 1.14 in this century as a result of the addition of alkyl-Pb in petrol. The Pb concentration profiles in the peat match the lakes, but the isotope profiles do not. During the fen-to-bog transition there is a rapid decline in the 206Pb/207Pb ratio from >1.3 to about 1.2, and the ratio continues to decline to the present. We hypothesise that this is because externally-derived Pb from long-range transport of soil dust and atmospheric pollution has always been more important in the ombrotrophic peat than in lakes, which have a greater influx of catchment-derived Pb.