인천연안 갯벌의 다환방향족탄화수소의 농도분포와 발생원 평가
Distributions and Sources of Polycyclic Aromatic Hydrocarbons in the Tidal Flat Sediments from Incheon Coastal Area
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인천연안 8개 지역 갯벌의 72개 지점의 표층퇴적물과 24개 지점의 주상퇴적물 시료를 2011년 봄·가을 2회에 걸쳐 채취하여, 다환방향족탄화수소(PAHs), 석유계총탄화수소(TPHs) 및 벤젠-톨루엔-에틸벤젠-자일렌(BTEX)의 시·공간적 농도분포 특성을 조사하였다. 또한 PAHs 화합물 구성비에 의한 오염발생기원을 평가하였다. 갯벌 전체의 PAHs 평균농도는 95.62 ㎍/kg으로 조사되었고, 계절별 PAHs 농도분포는 가을철이 봄철보다 낮은 특징을 보였다. 주상퇴적물의 PAHs 농도가 표층퇴적물보다 높았으며, 주상퇴적물의 상부가 하부보다 높은 농도분포를 보였다. 전체 갯벌의 TPHs 평균농도는 46 mg/kg으로조사되었고, TPHs 평균농도 분포 양상은 봄철보다 가을철이 현저하게 높고, 표층퇴적물이 주상퇴적물보다 높게 나타났다. 갯벌 퇴적물내 PAHs의 오염발생 기원을 평가한 결과, 장화리 갯벌의 표층퇴적물과 소래 및 옥련 갯벌의 주상퇴적물의PAHs 배출원은 연소와 석유류기원으로 조사되었고, 나머지 모든 갯벌은 연소기원으로 나타났다.
Abstract
Samples for estimating concentrations of polycyclic aromatic hydrocargons(PAHs), total petroleum hydrocarbons(TPHs), and benzene-toluene-ethylbenzene-xylene(BTEX) were collected at the tidal flat sediments of 8 coastal sites in Incheon, at seventy-two sampling stations for the surface sediment and twenty-four stations for the sediment core, twice in the spring and fall in 2011. This study was performed to evaluate the distributions of seasonal and spatial concentrations of PAHs,TPHs, and BTEX in the tidal flat sediments. The source origin of PAHs were carried out. The total average concentration of PAHs in the tidal flat sediment was 95.62 ㎍/kg. The characteristic of PAHs concentration distributions was observed that the average concentration in the autumn was lower than that in the spring, and higher concentration in the sediment core than the surface sediment, and greater vertical concentration at the top rather than the bottom in the sediment core. The total average concentration of TPHs at all sampling sites was in the value of 46 mg/kg. The characteristic of the TPHs concentration distribution was observed that the average concentration in the fall was much higher than that in the spring,and higher concentration in the surface sediment than the sediment core. The possible source of PAHs inputs were mainly derived from both pyrogenic and petrogenic origin at the surface sediment at Janghwari site and the sediment cores of both Sorae and Okyeon sites, while the rest sites of study areas originated with pyrogenic combustion.
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