Persistent Organic Pollutants in Sediments from Sai Gon–Dong Nai River Basin, Vietnam: Levels and Temporal Trends

  • Nguyen Hung Minh
  • Tu Binh Minh
  • Hisato Iwata
  • Natsuko Kajiwara
  • Tatsuya Kunisue
  • Shin Takahashi
  • Pham Hung Viet
  • Bui Cach Tuyen
  • Shinsuke Tanabe
Article

Abstract

Surficial sediment samples were collected from Hochiminh City canals, the Sai Gon–Dong Nai River, and its estuary, one of the most predominant industrial areas in Hochiminh City, southern Vietnam, for determination of selected persistent organic pollutants (POPs). Contamination pattern was as follows: PCBs ≥ DDTs > HCB > CHLs > HCHs. Concentrations of PCBs and DDTs ranged from 0.50–150 ng/g and 0.15–72 ng/g dry wt, respectively. On the other hand, concentrations of CHLs, HCHs, and HCB were mostly <2 ng/g dry wt. Levels of the all organochlorines (OCs) in Hochiminh City canals were significantly higher than those in the other areas, indicating the urban areas as major pollution sources to the aquatic environment. The contamination pattern was PCBs > DDTs in the city canals but PCBs < DDTs in the downstream and the estuary, suggesting particularly high contamination by PCBs in the city. Examination of DDTs composition and their ratios demonstrated continuous input of this pesticide to the city canals. However, the combination of our data and those from available literature implies a decreasing trend of PCBs and DDTs in the environment. DDTs concentrations have been reduced 50% after approximately 5 years. Composition of CHLs in the sediment from Hochiminh City canals was comparable to those of common technical mixtures, suggesting continuous input of CHLs to the environment. CHLs might be in use for purposes like termite control, wood preservation, and protection of underground cables. Hazard assessment implies high toxic potential of DDTs for sediments from Hochiminh City canals and suggests the need for better management of municipal discharges.

Keywords

Persistent organochlorine Sediment Temporal trend Vietnam 

Notes

Acknowledgments

This study was supported by a Grant-in-Aid for Scientific Research (A) (Project No. 16201014) from the Japanese Society for the Promotion of Science (JSPS). Financial assistance was also provided by Research Revolution 2002 (RR 2002) project for Sustainable Coexistence of Human, Nature and the Earth (FY 2002) of the MEXT of the Japanese Government; the Core University Program between Japan Society for the Promotion of Science (JSPS) and National Center for Natural Science and Technology, Vietnam (NCST), and “21st Century COE Program” from the Japanese Ministry of Education, Science, Sports, Culture and Technology. We thank Dr. A. Subramanian (Ehime University) for the critical reading of this manuscript and the staff of Nong Lam University, Hochiminh City, Vietnam, for their valuable support during our sampling surveys.

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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • Nguyen Hung Minh
    • 1
  • Tu Binh Minh
    • 1
  • Hisato Iwata
    • 1
  • Natsuko Kajiwara
    • 1
  • Tatsuya Kunisue
    • 1
  • Shin Takahashi
    • 1
  • Pham Hung Viet
    • 2
  • Bui Cach Tuyen
    • 3
  • Shinsuke Tanabe
    • 1
  1. 1.Center for Marine Environmental StudiesEhime UniversityMatsuyamaJapan
  2. 2.Hanoi National UniversityThanh Xuan DistrictVietnam
  3. 3.Nong Lam UniversityHochiminh CityVietnam

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