Tracing lead pollution sources in abandoned mine areas using stable Pb isotope ratios |
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Authors: | Eun-Jin Yoo Jung-A Lee Jae-Seon Park Khanghyun Lee Won-Seok Lee Jin-Seok Han Jong-Woo Choi |
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Institution: | 1. Environmental Measurement & Analysis Center, Department of Environmental Infrastructure Research, National Institute of Environmental Research, Environmental Research Complex, Kyungseo-dong, Seo-gu, Incheon, 404-708, Republic of Korea
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Abstract: | This study focused on Pb isotope ratios of sediments in areas around an abandoned mine to determine if the ratios can be used as a source tracer. For pretreatment, sediment samples were dissolved with mixed acids, and a multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS, Nu plasma II) was used to investigate the Pb isotopic composition of the samples. The measured isotope ratios were then corrected for instrumental mass fractionation by measuring the 203Tl/205Tl ratio. Repeated measurements with the NIST SRM 981 reference material showed that the precision of all ratios was below 104 ppm (±2σ) for 50 ng/g. The isotope ratios (207Pb/206Pb) found were 0.85073?±?0.0004~0.85373?±?0.0003 for the main stream, while they were 0.83736?±?0.0010 for the tributary and 0.84393?±?0.0002 for the confluence. A binary mixing equation for isotope ratios showed that the contributions of mine lead to neighboring areas were up to 60 %. Therefore, Pb isotope ratios can be a good source tracer for areas around abandoned mines. |
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