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14 kinds of PCBs were determined in water and soil of a paddy field in Dragon Bridge, Nanjing, P. R. China, which is a typical small watershed irrigated area. The results showed that: 14 congeners of PCBs were detected at different residue levels, the dominant components of PCBs were tri-, tetra-, and penta-chlorinated PCB congeners, accounting for 82.37% ~ 95.45% of total PCBs. The concentration...