The partition coefficients of eight kinds of benzene derivatives , which are wellknown toxic compounds, were measured in the aqueous two-phase systems containing polyethylene glycol (Mw = 7 ,500) and dipotassium hydrogenphosphate at 298 .
K.Results of correlation of bioconcentration factors with the partition coefficients measured in the aqueous two-phase system were compared with those obtained from the literature data which were determined in the octanol-water partition system for the benzene derivatives. It was found that the partition coefficients of benzene derivatives measured in the aqueous two-phase system could give a better correlation with the bioconcentration factors.
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