Metal contents and Pb isotopes in road-side dust and sediment of Japan

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• 作者：Anugrah Ricky Wijaya^a ; ^b ; ^{d_v_n_a_98@yahoo.com} ; Aaron Kenkichi Ouchi^a ; Kentaro Tanaka^a ; Ryuichi Shinjo^a ; Shigeru Ohde^a
• 关键词：Metal ; Road-side dust ; Sediment ; Tokyo ; Okinawa ; Pb isotope ratios
• 刊名：Journal of Geochemical Exploration
• 出版年：2012
• 期刊代码：44_03756742
• 类别：ear
• 出版时间：July, 2012
• 卷：118
• 期：Complete
• 页码：68-76
• 文件大小：923 K

摘要

In order to elucidate the sources of metals in urbanized areas, metal contents and Pb isotope ratios were determined in road-side dust and sediments samples collected from Tokyo, Osaka and Kyoto. The samples were leached using 1%HNO₃ for metal concentrations and Pb isotopes analysis. Metal (Pb, Cd, Zn, As, Cr and Ni) concentrations and Pb isotopes (²⁰⁶Pb, ²⁰⁷Pb and ²⁰⁸Pb) in the solutions were analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The extent of anthropogenic contribution to road-side dust was assessed by comparing the metal concentration values in road-side dust of the sample sites to those of Okinawa, an unpolluted road-side dust site due to low traffic density. Considering a Pb background of 21.0 ppm measured in the Okinawan road-side dust, Pb in road-side dust of Tokyo was found to be about twelve times higher which may indicate Pb pollution in the streets of Tokyo. The contaminated road-side dust can be transported into pond and river sediments during runoff and rainfall events. The concentrations of anthropogenic Pb in road-side dust and sediment were compared to those of other metals (Cd, Zn, As, Cr and Ni). There was a positive correlation found between Pb with Cd, Ni and Zn concentrations in sediment which suggests a common origin. The range of the Pb isotope ratios in road-side dust agreed well to that in the sediments (²⁰⁷Pb/²⁰⁶Pb = 0.8644-0.8688 and ²⁰⁸Pb/²⁰⁶Pb = 2.1044-2.170) suggesting that sediments may be contributed and transported by mean of road-side dust. Moreover, Pb isotope ratios (²⁰⁸Pb/²⁰⁶Pb and ²⁰⁷Pb/²⁰⁶Pb) confirmed that Pb pollution in the road-side dust and sediments was contributed the combination of battery and solder products.