Persistent Organic Pollutants in Sediments from Sai Gon–Dong Nai River Basin, Vietnam: Levels and Temporal Trends
Persistent Organic Pollutants in Sediments from Sai Gon–Dong Nai River Basin, Vietnam: Levels and Temporal Trends
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越南西贡-同奈河流域沉积物中的持久性有机污染物：水平和时间趋势
DOI：
10.1007/s00244-006-0157-5
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发表时间：
2007
影响因子：
4
通讯作者：
S. Tanabe
中科院分区：
文献类型：
--
作者：
N. Minh;T. Minh;H. Iwata;N. Kajiwara;T. Kunisue;Shin Takahashi;P. Viet;B. Tuyen;S. Tanabe
从胡志明市运河，西贡洞奈河，其河口，在胡志明市，越南南部，最主要的工业区之一，收集了表层沉积物样品，用于确定选定的持久性有机污染物（持久性有机污染物）。结果表明，污染模式为：PCBs ≥ DDTs > HCB > CHLs > HCHs。多氯联苯和滴滴涕的浓度分别为0.50-150纳克/克和0.15-72纳克/克（干重）。另一方面，氯化锂、六氯环己烷和六氯苯的浓度大多数低于2纳克/克干重。胡志明市运河中的所有有机氯（OC）的水平显着高于其他地区，表明城市地区的主要污染源的水环境。污染模式为PCBs > DDTs在城市运河，但PCBs < DDTs在下游和河口，表明特别是高污染的PCBs在城市。DDTs的成分和它们的比例的检查证明了这种农药的持续输入到城市运河。然而，我们的数据和现有文献的数据相结合，意味着环境中的多氯联苯和滴滴涕的下降趋势。大约5年后，滴滴涕浓度降低了50%。胡志明市运河沉积物中的叶绿素组成与普通技术混合物相当，表明叶绿素持续进入环境。CHL可能用于白蚁控制、木材防腐和地下电缆保护等目的。危害评估表明，胡志明市运河沉积物中滴滴涕的潜在毒性很高，并建议需要更好地管理市政排放。
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.