Selection of Priority Contaminants in a Watershed Using Risk Ranking Methodology

Huan jing ke xue= Huanjing kexue
Qifeng LiYueqing Zhang

Abstract

The present study focuses on the risk rankings of different contaminants from Daling River in Liaoning Province, China, for categorizing the environmental risk levels in the river. Eighteen surface water samples were collected from Daling River, which has been polluted by the surrounding fluorine industries for years. Perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and heavy metals were analyzed, and relevant eco-toxicity data obtained from literatures were considered. The median concentrations of PFOS and PFOA were observed as 0.77-3.57 ng·L-1 and 82.93-344 ng·L-1, respectively, which were lower than the standard limits of the United Kingdom. The concentrations of heavy metals and organochlorine pesticides (OCPs) were found to be lower than level Ⅳ of the Chinese national environmental quality standards for surface water. The maximum concentrations of mercury (Hg) and arsenic (As) were higher than the standard level Ⅲ. The environmental risks ranged from 1.42×10-6 to 2.3×10-2. The order of the risks by potential environmental contaminants was Cu > Zn > As > p,p'-DDE > p,p'-DDT > Cd > Pb > Hg > PFOA > γ-HCH > Cr > Ni > α-HCH > PFOS. The present findings revealed that the environmental risks of PFOS and PFOA ...Continue Reading

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