Concentration and Partitioning of Polycyclic Aromatic Hydrocarbons(PAHs) in the Lake of Sihwa

시화호 중 다환방향족탄화수소(PAHs)의 농도와 매질별 분배 특성

  • Kim, Jong-Guk (Environmental Engineering, Chonbuk National University) ;
  • Kim, Hyoung-Seop (Center for Chemical Safety Management, Chonbuk National University) ;
  • Kim, Kyoung-Sim (Center for Chemical Safety Management, Chonbuk National University) ;
  • Lee, Doung-Soo (Graduate School of Environmental Studies, Seoul National University)
  • 김종국 (전북대학교 공과대학 환경공학과) ;
  • 김형섭 (전북대학교 화학물질안전관리연구센터) ;
  • 김경심 (전북대학교 화학물질안전관리연구센터) ;
  • 이동수 (서울대학교 환경대학원)
  • Published : 2005.07.31

Abstract

The characteristics of hydrospheric concentration and distribution of polycyclic aromatic hydrocarbons (PAHs) in the Lake of Sihwa were investigated on this study. Sediment and Surface water samples were collected from upstream and downstream in Lake of Sihwa. The total PAHs concentrations of surface water were $21.9{\sim}49.6\;ng/L$ at upstream and $19.4{\sim}99.7\;ng/L$ at downstream, respectively. Most of the PAHs existed in the dissolved phase with average 87%. In the case of sediment samples, total PAHs concentrations were $51.7{\sim}325\;ng/g-dry$ at upstream and $13.4{\sim}72.3\;ng/g-dry$ at downstream, respectively. Low-and-middle molecular weight of PAHs were dominated in dissolved phase of the surface water, while middle-and-high molecular weight compounds were predominantly present in the particular phase of the surface water and sediment. The average slope obtained from the plots of log-log scaled dissolved/solid partition coefficient vs. octanol/water partition coefficient was $0.73{\pm}0.12$ and the slope from the water/sediment partition coefficient was $0.59{\pm}0.10$. These results indicated that distribution of PAHs between the dissolved phase and the solid phase was not at equilibrium as well as between water and sediment.

시화호를 대상으로 수계 중 다환방향족탄화수소(PAHs)의 농도와 분포특성을 조사하였다. 용존상과 입자상으로 분리된 물시료와 저질 시료를 분석한 결과 시화호의 상류인 반월지역과 하류인 시화지역의 물 시료 중 PAHs 농도는 각각 $21.9{\sim}49.6\;ng/L$, $19.4{\sim}99.7\;ng/L$로 나타났으며, $85{\sim}90%$ 정도가 용존상에 존재하였다. 또한 저질시료에서는 반월지역이 $51.7{\sim}325\;ng/g-dry$, 시화지역이 $13.4{\sim}72.3\;ng/g-dry$으로 다소 지역적 차이가 있는 것으로 나타났다. 수중 용존상은 저분자와 중간 분자량대 화합물이 주를 이루고 수중 입자상과 저질은 중간 분자량과 고분자량대 화합물이 주를 이루고 있었다. 옥탄올/물 분배계수에 대한 수중 용존상/입자상 분배계수로부터 얻어진 회귀직선의 기울기는 $0.73{\pm}0.12$로 나타났으며, 물/저질 분배계수로부터 얻어진 기울기는 $0.59{\pm}0.10$으로 나타났다. 이러한 결과로부터 저질/물 사이의 분배현상 뿐만 아니라 수중 용존/입자 상 분배 현상도 평형에 도달하고 있지 못한 것을 알 수 있었다.

Keywords

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