Results showed that the amounts of high-chlorinated congeners (hepta- and octa-PCBs) in soil samples were less than those of low- and mid-chlorinated congeners because of lower water solubility for higher chlorinated congeners. Sagrario et al. (2002) reported similar findings in aquatic plants. Fig. 4 showed that low-chlorinated congeners (diand tri-PCBs) and mid-chlorinated congeners (tetra-,penta-, and hexa-PCBs) had higher ratios of PCBs remaining in soil samples than those of high-chlorinated congeners (hepta- and octa-PCBs).