Bioconcentration factors and kinetics of chlorobenzenes in a juvenile crab (Portunus pelagicus L.)
1993
Mortimer, M.R. | Connell, D.W. (Griffith Univ., Nathan (Australia). Faculty of Environmental Sciences)
The uptake- and depuration-rate constants (k1 and k2 respectively), according to first-order kinetics, were measured for a series of chlorobenzenes with juvenile crabs, Portunus pelagicus. These constants were found to be related to the lipophilicity of the chlorobenzenes as expressed by the octanol-water coefficient (log Kow), giving relationships similar to those observed with fish. However, the actual magnitude of the rate constants on a lipid basis were about 10 times faster than those for fish. The difference in the relationship of the bioconcentration factor with the octanol-water coefficient compared with other aquatic organisms is probably due to the relatively low lipid content of the crabs. It is suggested that the bioconcentration of essentially nonbiodegradable lipophilic compounds occurs as a result of partitioning between biota lipid and water. Other physicochemical properties (molar volume and aqueous solubility) and two molecular descriptors exhibited good correlations with the bioconcentration characteristics.
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