利用铅同位素比对射击场灌溉水库铅污染原因的研究

O. Nagafuchi, K. Nakazawa, Ken’ichi Shinozuka
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摘要

为明确上游有射击场的灌溉水库中铅的来源,对射击场内的小溪沉积物、射击场上游的沉积物和土壤、灌溉水库中的沉积物和河水进行了观测。众所周知,每个铅矿的铅稳定同位素比值都有一个初始值。射击场上游和下游样品土壤和沉积物中Pb稳定同位素比值完全不同。根据子弹黄铜涂层中铅和其他金属(锌和铜)的组成比例,得到了距离指数(D.I.)。计算结果用于聚类分析。聚类分析结果表明,上游和下游的土壤和沉积物样品存在明显差异。结果表明,利用Pb同位素比值、D.I.和聚类分析相结合的方法可以很好地反映土壤和沉积物中Pb污染的来源。
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Investigation on Cause of Lead Contamination in Irrigation Reservoir under Shooting Range Using Lead Isotope Ratio
To clarify the origin of lead ( Pb ) in an irrigation reservoir with a shooting range in upstream, sediments of a small stream located in the shooting range, sediments and soil from upstream of the shooting range, sediments in the irrigation reservoir, and river water have been observed. It is well known that the Pb stable isotope ratio has an original value in each Pb mine. The Pb stable isotope ratios in soil and sediment were totally different between the samples from upstream and downstream of the shooting range. On the basis of the composition ratios of Pb and other metals ( zinc and copper ) used in the brass coating of bullets, the distance index ( D.I. ) was calculated and the results were applied for cluster analysis. Both D.I. and cluster analysis results indicated that soil and sediment samples from the upstream and downstream are clearly different. Our results indicate that our integrated approach of using the Pb isotope ratio, D.I. and cluster analysis is a good indicator of the origin of Pb contamination in soil and sediment.
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