Identification of environmental lead sources and pathways in a mining and smelting town: Mount Isa, Australia

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• 作者：A.K. Mackay ; M.P. Taylor ; N.C. Munksgaard ; K.A. Hudson-Edwards ; L. Burn-Nunes
• 关键词：Lead (Pb) ; Blood lead (PbB) ; Contamination ; Lead isotope ; Mining and smelting ; Mount Isa
• 刊名：Environmental Pollution
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：180
• 期：Complete
• 页码：304-311
• 全文大小：1094 K

文摘

Lead (Pb) concentrations and isotopic compositions from soils, dusts and aerosols from public land and residential lots adjacent to the copper and Pb mine and smelter at Mount Isa, Australia, were examined to understand the sources and risks of environmental Pb exposure. Urban soil samples contain elevated Pb concentrations (mean 1560?mg/kg), of which 45-85 % of the Pb is bioaccessible. The Pb isotopic composition of surface soils (0-2?cm), aerosols and dusts (²⁰⁶Pb/²⁰⁷Pb, ²⁰⁸Pb/²⁰⁷Pb range: 1.049, 2.322-1.069, 2.345) are dominated by Pb derived from the Mount Isa Pb-zinc ore bodies. Underlying soil horizons (10-20?cm) have distinctly different Pb isotopic compositions (²⁰⁶Pb/²⁰⁷Pb, ²⁰⁸Pb/²⁰⁷Pb range: 1.093, 2.354-1.212, 2.495). Surface soil-, dust- and aerosol-Pb are derived predominantly from smelter emissions and fugitive mining sources and not from in situ weathered bedrock. Remediation strategies should target legacy and ongoing sources of environmental Pb to mitigate the problem of Pb exposure at Mount Isa.