A comparison of lead isotope ratios in the bark pockets and annual rings of two beech trees collected in Derbyshire and South Yorkshire, UK
A comparison of lead isotope ratios in the bark pockets and annual rings of two beech trees collected in Derbyshire and South Yorkshire, UK
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DOI：
10.1016/j.scitotenv.2003.08.030
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发表时间：
2004-04-05
影响因子：
9.8
通讯作者：
McLeod, CW
中科院分区：
文献类型：
--
作者：
Bellis, DJ;Satake, K;McLeod, CW
用ICP-MS分析了两种山毛榉（Fagus sylvatica L.）从英国德比郡朗肖和南约克郡斯温顿采集的树木记录了Pb-206/（201）Pb同位素比率的差异。在Longshaw样本中，树皮袋的Pb-206/Pb-201同位素比值（近似于1914-1998年，78-260 mug g（-1）Pb）从约1.16下降到1.12，而年轮（1899-1998年，0.2-2.5 mug g（-1）Pb）的Pb-206/ Pb-207比值约为1.18。在斯温顿样本中，树皮口袋（约1919-1998年，7-78 mug g（-1）Pb）从1.15下降到1.11，年轮（1899-1998年，0.2-0.5 mug g（-1）Pb）从1.18下降到1.15。这些数据表明，树皮口袋通过干湿沉降直接从大气中积累铅，而年轮通过根系从土壤中积累铅。树皮区记录了铅冶炼和燃煤等本地来源的铅积累相对下降（1.17-1.19），而澳大利亚矿石冶炼（1.04）和含铅汽油使用（1.06-1.09）等进口来源的铅积累增加。相比之下，Longshaw的年轮记录了典型的本地铅的比率，而Swinton的年轮记录了Pb-206/Pb-207的相对较小的下降，反映了含铅汽油的使用。树皮口袋中铅-206/铅-207的下降是一致的铅-216/铅-217大气铅记录在泥炭，湖泊沉积物和档案牧草在英国其他地点的历史下降。(C)2003 Elsevier B. V.保留所有权利。
ICP-MS analysis of the bark pockets and annual rings of two beech (Fagus sylvatica L.) trees collected from Longshaw, Derbyshire and Swinton, South Yorkshire in the UK recorded differences in the Pb-206/(201) Pb isotope ratio. In the Longshaw sample, the Pb-206/Pb-201 isotope ratio of the bark pockets (approximate to 1914-1998, 78-260 mug g(-1) Pb) declined from approximately 1.16 to 1.12, whilst the annual rings ( 1899-1998, 0.2-2.5 mug g(-1) Pb) had a Pb-206/ Pb-207 ratio of approximately 1.18. In the Swinton sample, the bark pockets (approximate to 1919-1998, 7-78 mug g(-1) Pb) declined from 1.15 to 1.11 and the annual rings (1899-1998, 0.2-0.5 mug g(-1) Pb) from 1.18 to 1.15. The data implied that the bark pockets accumulated lead directly from the atmosphere through wet and dry deposition, whilst the annual rings accumulated lead from the soil via the roots. The bark pockets recorded a relative decline in the accumulation of lead from indigenous sources, such as lead smelting and coal combustion (1.17-1.19), and increase in imported sources such as the smelting of Australian ores (1.04) and leaded petrol usage (1.06-1.09). in contrast, the annual rings at Longshaw recorded ratios typical of indigenous lead, whilst the annual rings in Swinton recorded a relatively small decrease in Pb-206/Pb-207 reflecting leaded petrol usage. The decline in Pb-206/Pb-207 of the bark pockets was consistent with the historical decline in Pb-216/Pb-217 of atmospheric lead recorded in peat, lake sediments and archival herbage at other UK locations. (C) 2003 Elsevier B.V. All rights reserved.