Characterization of PCB contamination in Erh-Jen River

• Main Authors: Ming -Tsai, 陳明財
• Other Authors: I Ming Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/78429957592128433544

碩士 === 嘉南藥理科技大學 === 環境工程與科學系碩士班 === 95 === Abstract Erh-Jen river basin had been contaminated by domestic and stock farming waste water, and the tributary San-Ye-Gung creek also polluted by industrials the fact in down river.After decades of uncontrolled discharging Erh-Jen river became the most heavily polluted river in priority Taiwans, and the pollution had the tendency to expand. Polychlorinated biphenyls（PCBs）were considered as the hazardous chemacal controlled by the environmental protection administration.This group of compounds was verified and stored in the bottom mud in the rivers and creeks in the past research. In order to investigate polychlorinated biphenyls(PCBs) contamination in the river sediment in southern Taiwan. Different layers (the upper layer to the lower layer,0~60cm in depth) of sediments from 6 locations were collected in October,2005 and December, 2006, separately. After extraction and GC analysis, the results showed the PCBs concentration in the lower layers were higher than the upper layers, and in the downstream locations were higher than the upstream locations. The total PCBs concentration of all samples were range from 0~2.718 ppm. 2,5,2’-CB-chlorobiphenyl (2,5,2’-CB), 2,4,3’,4’-CB, 2,5,3’,5’-CB, 2,3,6,3’,4’-CB, 2,4,5,3’,4’-CB and 2,3,4,5,2’,3’,4’-CB were the most abundant congeners. Among these congeners, the highly chlorinated ones with 5~6 chlorines were originated from Aroclors, and the less chlorinated ones with 3~4 chlorines were possibly from the dechlorination of highly chlorinated PCBs. Except the lower layer of the most downstream site,the layers with significant PCBs contamination showed the similar congener distribution with Aroclor 1242 and 1254. By comparing the concentration and distribution of PCBs contaminant in a sequence of time,the results suggested that the dechlorination of PCBs was seemingly inhibited in recent years and the persisted PCBs contamination was moving toward the sea.