The relationship between octanol/water partition coefficient (Kow) and bioconcentration factor (BCF) of 14 monochloro‐ to pentachloronitrobenzenes were examined in rainbow trout through waterborne and dietary exposure studies. The results indicated BCF was not significantly correlated with Kow for this chemical group. The role of chemical half‐lives and chemical absorption efficiencies are examined as factors that could explain why the BCF of some chemical groups are lower than predicted.
Chlorinated phenolic derivatives are important chemical constituents that are present in pulp and paper mill effluents. Subadult rainbow trout (Sulmo guirdneri) were exposed to six dichloroto terachloroguaiacols, two chlorinated vanillins and trichlorosyringol through waterborne and dietary exposure. Equilibrium concentrations were attained within 2 d in waterborne exposed fish, and bioconcentration factor (BCF) values ranged from 1 to 270 among the guaiacols, less than 5 for the chlorovanillins and 125 for trichlorosyringol. Dietary exposure indicated these chemicals are poorly absorbed and have half-lives of less than several days. The kinetics of these chemicals are consistent with residue levels reported in fish collected from waters receiving mill effluents where waterborne uptake appears to be the primary mode for accumulation.
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