The Sr and Pb Isotopic and Geochemical Properties of the Atmospheric Bulk Deposition of Jeonju, Gunsan, and Namweon Areas

전주, 군산, 남원지역 강수의 Sr, Pb동위원소 지화학

  • Jeon Seo-Ryeong (Department of Earth and Environmental Sciences, Chonbuk National University) ;
  • Chung Jae-il (Department of Earth and Environmental Sciences, Chonbuk National University)
  • 전서령 (전북대학교 지구환경과학과) ;
  • 정재일 (전북대학교 지구환경과학과)
  • Published : 2005.08.01

Abstract

The Sr and Pb isotopic ratios and chemical composition were measured for atmospheric bulk deposition samples collected in the Jeonju, Gunsan and Namweon areas over a period of one year. Acidity of deposition ranged pH $4\~7$ with little higher in dry season, and around pH 5.0 in rainy season. The EC and TDS of rainy season was low showing dilution effect, and increased during dry season. Sulfate $(SO_4)\;and\;NO_3$ are atmospheric aerosols largely of anthropogenic origin in winter. Sodium was concentrated in winter deposition, Ca was concentrated in spring to summer deposition. Namweon has lower EC and TDS than those of other, and Jeonju has higher. Namweon was concentrated in $HCO_3$ and Cunsan was concentrated in Cl. Aluminium, Cu, and Zn show good correlation index with TDS, indicating of their origin atmospheric. $^{87}Sr/^{86}Sr$ ratios of bulk deposition ranged from 0.7109 to 0.7128. The isotopic variations are correlated with mixing of isotopic compositions of local soils, road deposit and biogenic aerosol. In order to constrain further the origin of aerosols in rainwater, it will be necessary to collect additional Sr isotopic data for aerosols. Lead isotope ratios for all areas were similar and belonged to Pb isotope ratios of Seoul's aerosols, but little different with Beijing's aerosols. It showing that Pb in the Korea mainly derived from the gasoline combustion, not exclusively from the Beijing.

Keywords

bulk deposition;aerosols;anthropogenic;Sr isotope;Pb isotope

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