Korean Journal of Environmental Biology (환경생물)

  • Volume 22
  • /
  • Pages.30-37
  • /
  • 2004
  • /
  • 1226-9999(pISSN)
  • /
  • 2287-7851(eISSN)
Korean Society of Environmental Biology (한국환경생물학회)
권호 표지

Environmental Occurrence of Persistent Organochlorines in Gwangyang Bay

광양만내 지속성유기염소계화합물의 잔류농도 및 분포특성

  • 홍상희 (한국해양연구원 남해연구소) ;
  • 임운혁 (한국해양연구원 남해연구소) ;
  • 심원준 (한국해양연구원 남해연구소) ;
  • 오재룡 (한국해양연구원 남해연구소)
  • Published : 2004.03.01
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Abstract

Peysistent oyganochlorine compounds (OCs) weve determined in sediments and bivalves from Gwangyang Bay. The concentrations of ∑PCB, ∑DDT, ∑HCH and ∑CHL in sediments were in the range of f 2.25∼11.4 ng g$\^$-1/, 0.16∼1.16 ng g$\^$-1/, nd∼0.51 ng g$\^$-1/, and 0.05∼0.79 ng g$\^$-1/, respectively. The overall OCs concentrations in sediments were below the effect range -median (ER-M) values toy benthic organisms suggested by NOAA (1991). Levels of PCB compounds a re relatively lower than other industrialized bays (Pusan Bay, Ulsan Bay, and Youngil Bay). OCs accumulated in bivalves were higher than those in sediments. In bivalves, the concentration ranges of ∑PCB, ∑DDT, ∑HCH and ∑CHL were 9.97∼31.7 ng g$\^$-1/, 7.54∼22.6 ng g$\^$-1/, 0.49∼2.0 ng g$\^$-1/, and 0.82∼7.32 ng g$\^$-1/, respectively. Relatively high PCB concentrations in both environmental matrices are found at the inner bay than the outer part, indicating that the sources of PCBs were located inside the bay. DDT compound showed relatively high concentrations in the vicinity of the mouth of river and urban area, whereas other organochlorine pesticides show homogeneous distributions over the bay. Homologue profile of PCB compounds shows that low-chlorinated congeners (especially, di-, tyi- and tetra-) are abundant in Gwangynng Bay, which is diferent from other areas in Korea.

PCB 화합물 및 유기기염소계농약류는 난분해성이며 독성이 높은 대표적인 유기오염물질로서 환경 중에 배출되면 오랜 시간 잔류하게 된다. 대부분의 유기염소계화합물은 우선적 관찰 및 규제 대상물질로 분류되어 지구적 관심을 모으고 있다. 광양만은 대단위의 공업단지가 밀집해있고 반폐쇄적인 지형학적 구조를 가지고 있어 유기염소계화합물의 오염이 우려되는 대표적인 해역이다. 본 연구에서는 오염 모니터링에 대표적으로 이용되는 퇴적물과 부착성 이매패류를 채집하여 분석함으로써 광양만내 지속성유기 염소계화합물의 잔류현황을 파악하고 각 화합물의 분포특성을 살펴보고자 하였다. 퇴적물 및 생물에잔류하는 유기염소계화합물은 전반적으르_ 낮은 농도를 나타냈으며, 독성학적 관점에서 볼 때 생태계에 미치는 영향은 낮은 것으로 판단된다. 퇴적물 및 이매패류 모두에서 PCB화합물은 만의 안쪽에서 상대적으로 높은 분포패턴을 보이고 있다. 이는 만의 안쪽에 PCB오염원이 존재함을 보여준다. 광양만 퇴적물층에서의 PCB화합물은 Low-chlorinated PCB (Di-, Tri-, Tetra-PCBs)가 우세한 조성을 나타냈다. 이는 대부분의 연안해역의 퇴적물 층에서 전반적으로 Mid- 혹은 High-chlorinated PCB가 우세한 점을 고려할 때 광양만의 독특한 패턴으로서 PCB 화합물의 오염원의 종류 및 유입경로와 관계되는 것으로 사료되며 이에 대한 차후의 연구가 필요하다. DDT 화합물 및 기타 유기염소계농약류의 조성비는 광양만내로의 유기염소계농약의 최근 유입의 가능성이 상대적으로 적어졌음을 나타냈다.

Keywords

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