However, a deviation of such pattern was observed in
B. rodriguezii of LC and S, being tetra (27%), penta (31%) and hexa
(28%)-chlorinated and penta (31%) and hexa (30%)-chlorinated the
predominant homologues, respectively (Fig. 4). This pattern coincides
with the commercial mixtures used at this region. Las
Chacras and Seco creek watersheds are under the influence of the
municipal landfill, which could be related to such point source.
Since PCB production and use are globally forbidden, landfills are
one of the main sources of these compounds to the environment
(Breivik et al., 2007).