BIOCONCENTRATION KINETICS OF CHLORINATED ANILINES IN GUPPY, POECILIA-RETICULATA

This study describes the uptake and elimination of 2,3,4,5-tetrachloro aniline, 2,3,5,6-tetrachloroaniline, pentachloroaniline, and 1,2,3,5-t etrachlorobenzene in guppy, Poecilia reticulaza. The experimentally de termined bioconcentration factors of the chlorinated anilines in guppy are much lower than can be expected based on previously published lin ear relationships between log BCF and log K(OW) for chlorobenzenes. In contrast to the mono-phasic elimination of 1,2,3,5-tetrachlorobenzene , the elimination of the chlorinated anilines is best described by a b i-exponential equation. The initial fast elimination of the chloroanil ines is the cause for the relatively low BCF values of 2,3,5,6-tetrach loroaniline and pentachloroaniline. The lower BCF value of 2.3,4,5-tet rachloroaniline may be caused by a lower uptake rate in combination wi th an initial fast elimination.