“…Similar to the studies by Jarman et al (1998) and Yanik et al (2003), a trend of isotope depletion with increasing chlorine content was observed. For most PCB congeners in the carp samples, including PCBs 22,28/31,44,52,66,70,and 74, there is some isotope agreement with the PCBs in the spiked food, as shown in Fig.…”