Enantioselectivity of polychlorinated biphenyl atropisomers in sediment and biota from the Turtle/Brunswick River estuary, Georgia, USA

► Chiral polychlorinated biphenyls measured at an estuarine site. ► Sediment microbial reductive dechlorination of heavily chlorinated PCBs exists. ► Trophic transfer of biochemically weathered PCBs in estuarine food web. ► Fish and dolphins appear to have biotransformed some chiral PCBs.