COMPOUND DEPENDENCE OF THE RELATIONSHIP LOG K-OW AND LOG BCFL - A COMPARISON BETWEEN CHLOROBENZENES (CBS) FOR RAINBOW-TROUT AND POLYCYCLIC AROMATIC-HYDROCARBONS (PAHS) FOR DAPHNIA

Linear relatinships between log bioconcentration factor (BCF) and log K-ow for a variety of compounds have been reported many times in the l iterature. Analysis of the thermodynamics of the two partition process es has, however, shown that they are not analogous and that linear rel ationships can be expected to have different slopes for structurally u nrelated compounds. In this study a set of literature lipid normalized BCF (BCFL) values of chlorbenzenes (CBs) for rainbow trout and polycy clic aromatic hydrocarbons (PAHs) for Daphnia was put together with li terature K-ow values. The slopes of the regression lines for log BCFL versus log K-ow for the two groups of compounds proved to differ signi ficantly in a statistical test using analysis of variance (ANOVA). The difference, which is of significance for estimates of BCFs in environ mental modelling of these types of compounds, is explained by the diff erences in chemical structure of the two groups of compounds.