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09월 04일 13시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
Integrated Approach towards Environmental Assessment of Trace Organic Pollutants
2009년 9월 15일 18시 52분 33초
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금 16시 : 10분
Emerging Pollutants in the Environment
Jong Seong Khim
Division of Environmental Science and Ecological Engineering, Korea University, Seoul 136-713, Korea, Korea
An integrated approach looking for biological effects in addition to chemical detection becomes of great concern in environmental assessment of trace organic pollutants worldwide, however, such approach has not been well adopted in Korea yet. Until mid-1990s, very few studies reported trace organic contamination in coastal area of Korea and most of them focused sorely on analytical determination. The concept of biological effects together with chemical identification was first employed in our pollution study in late 1990s and I hereby summarize the major findings we obtained. The present abstract will highlight toxicity identification and evaluation (TIE) and mass balance approach (MBA), which are the keys in determining biologically effective chemicals present in environmental mixture samples. Overall, the instrumental data suggested that concentrations of target trace organic pollutants were relatively low to moderate but showed widespread distribution. The compositional pattern and spatial distribution indicated that their sources were independent of each other though. There were also some localized zones with extremely high concentrations of certain chemicals indicating point sources. To address biological effects, in vitro bioassays using H4IIE-luc (dioxin-like) and MVLN cells (estrogenic) exposed to organic extracts and TIE and MBA are performed. Most of the dioxin-like activities were observed in the fractions containing dioxins, furans, and certain polycyclic aromatic hydrocarbons (PAHs) and about half of the samples showed significant estrogenic activities in PAHs and alkylphenols fractions. A direct relationship between instrumental data and in other bioassays such as amphipod and sea urchin test will be further analyzed cross the full data set. Overall, we found that the combined approach of chemistry and toxicology was useful but it should be noted that the known composition and concentrations of target chemicals could not fully account for overall biological responses. Therefore, we expect more elaborate characterization of chemicals and their composition associated with some fractions should improve further understanding. Keywords: POPs, biological effect, pollution, coastal environment, Korea
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