Concentrations, Possible Sources and Influence Factors of Dissolved Polychlorinated Biphenyls in the Water of Yangzhuang Coal Mining Subsidence Area, China

Abstract

To understand the content, composition and other pollution states of dissolved PCBs in the waters of coal mining subsidence area, the research object is determined as the water of Yangzhuang mining subsidence area. Seven point locations are selected there and three layers of water samples are collected in each of the point locations so as to detect and analyze PCBs with GC-MS and make sources recognition and analysis of relative factors. Results show that other PCB congeners all have been detected except PCB138 congener among the 14 detected PCBs congeners. PCBs mainly consist of trichlorodiphenyl and pentachlorodiphenyl. These two substances in each site occupy 59 to 79% of total PCBs. The pollution sources are primarily two sorts: the atmospheric transmission source and the unintended source. PCBs content has a moderate linear positive correlation with DOC and water temperature and a moderate linear negative correlation with DO. PCBs concentration is in a lower-middle level.