Historical record of metal accumulation and lead source in the southeastern coastal region of Korea |
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Authors: | Dhong-il Lim Seung Woon Jung Man Sik Choi Sun Mee Kang Hoi Soo Jung Jin Yong Choi |
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Affiliation: | 1. Library of Marine Samples (LIMS), South Sea Research Institute, Korea Institute of Ocean Science and Technology, Geoje 656-830, Republic of Korea;2. Division of Earth and Environmental Sciences, Chungnam National University, Gungdong 220, Yuseong-gu, Daejeon 305-764, Republic of Korea;3. Marine Environment and Conservation Research Department, Korea Institute of Ocean Science and Technology, Ansan, P.O. Box 29, Seoul 425-600, Republic of Korea;4. Department of Oceanography, Kunsan National University, Kunsan 573-751, Republic of Korea |
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Abstract: | Concentrations of heavy metals and Pb isotopes were measured in the 1-M HCl leaching fraction of core sediments spanning the last 400 years. This sedimentary record of pollution history in metal concentrations shows a good correlation with the increases in industrialization, urbanization, and energy consumption since 1901s. Notably, the Pb concentration and the 207Pb/206Pb and 208Pb/206Pb ratios were constant before the 1910s (16.7 μg/g, 0.844, and 2.098, respectively), whereas they increased steadily up to 21.9 μg/g, 0.848, and 2.101 after the 1910s. The correlations between Pb isotope ratios (206Pb, 207Pb, and 208Pb) showed different linear regression trends for core sediments before and after the 1910s, indicating differences in Pb sources. Our interpretation suggests that the source of anthropogenic Pb in Korean coastal region and the Yellow Sea shelf was presumed to be Chinese coals or ores, which have also played a major role as sources of atmospheric particulate Pb. |
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Keywords: | Pollution history Pb isotope ratios Atmospheric dust Coastal sediments |
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