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제118회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Pb concentrations and the Pb isotope record in northwest Greenland snow

2016년 8월 30일 22시 32분 29초
ANAL1-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 14시 : 40분
분석화학 - Recent Trends in Analytical Chemistry I: Elemental and Environmental Analysis
저자 및
한국해양과학기술원 부설 극지연구소 극지고환경연구부, Korea
We present lead (Pb) concentrations and Pb isotope ratios from northwest Greenland snow pit samples covering a six-year period, from spring 2003 to early summer 2009. Pb concentrations ranged widely, from 2.7 pg g–1 to 99.7 pg g–1, with a mean concentration of 21.6 pg g–1; these values are statistically slightly higher than values recorded for 1991−1995. Pb concentrations exhibit seasonal spikes in winter−spring layers. Crustal Pb enrichment factors (EF) suggest that the snow pit is highly enriched with Pb of predominantly anthropogenic origin, with EF values inversely correlated with Pb concentrations. The 206Pb/207Pb isotope ratio of our samples ranged from 1.144−1.169, indicating relatively large differences between less radiogenic Eurasian-type and more radiogenic Canadian-type signatures, suggesting several potential source areas of Pb reaching northwest Greenland. Abrupt changes in Pb concentrations and Pb isotope ratios were observed and related to seasonal shifts in source regions of aerosol transport. The 206Pb/207Pb isotope ratio increased steadily between 2003 and 2009. The similarity in isotope ratios between our samples and Chinese urban aerosols suggest a relatively high and steadily increasing contribution of Chinese Pb to northwest Greenland snow.