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

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