“…The dl-PCBs PCB-77, PCB-105 and PCB-118 provided 0%-8.6%, 1.3%-3.1%, and 3.3%-7.6% of the total PCB concentrations, respectively. The congener profiles were close to those found in similar environments (Blais et al, 1998;Weiss et al, 2000;Estellano et al, 2008). As for the elevation gradient distribution, PCBs showed a similar tendency with PCDD/Fs in some relatively high levels of congeners, such as PCB-28, PCB-52, PCB-101 and total PCBs (Fig.…”