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Contamination Assessment of Surface Sediments in Urban Rivers, Busan

부산지역 도시하천 표층 퇴적물 오염도 평가에 관한 연구

  • Kwag, Jin-Suk (Busan Metropolitan City Institute of Health & Environment) ;
  • Son, Jung-Won (Busan Metropolitan City Institute of Health & Environment) ;
  • Kim, Chu-In (Busan Metropolitan City Institute of Health & Environment) ;
  • Song, Bok-Joo (Busan Metropolitan City Institute of Health & Environment)
  • 곽진숙 (부산광역시 보건환경연구원) ;
  • 손정원 (부산광역시 보건환경연구원) ;
  • 김주인 (부산광역시 보건환경연구원) ;
  • 송복주 (부산광역시 보건환경연구원)
  • Received : 2020.12.07
  • Accepted : 2021.07.14
  • Published : 2021.07.30

Abstract

This work investigated heavy metal pollution in surface sediments of rivers in Busan, Korea. Surface sediments were analyzed in order to conduct contamination assessment of organic matter, nutrients, and heavy metal concentrations. Contamination assessment of heavy metals was conducted using geoaccumulation index (Igeo), pollution load index (PLI), and potential ecological risk index (RI). Accumulation of organic matter and nutrients were affected by water discharged from sewage treatment plant. The concentrations of organic matter and nutrients were found to be greater in points which were close to the sewage treatment plant more than points furthest. The concentrations of Pb, Zn, Cu, Cd, Hg, As, Cr, and Ni were found to be greater in surface sediment more than in the background. The mean concentrations of heavy metals were in the order of Zn (323.5 mg/kg) > Cu (70.5 mg/kg) > Pb (39.8 mg/kg) > Cr (33.4 mg/kg) > Ni (13.5 mg/kg) > As (9.4 mg/kg) > Cd (0.84 mg/kg) > Hg (0.092 mg/kg). The result of geoaccumulation indices indicated that Hg > Cr > Cu > Ni > Zn > As > Pb > Cd were found in order of severe contamination by heavy metals. From PLI and RI analysis, it was evident that the Suyeonggang 2 was the most contaminated river.

Keywords

Acknowledgement

The authors are grateful to the Republic of Korea National Institute of Environmental Research (NIER) who funded the research reported in this paper.

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