Abstract: To estimate the bioconcentration factor (BCF) of benzene derivatives in fish by gas chromatography retention time (t_R), this paper measured the BCF of chlorobenzene, o-chloro-toluene, p-dichlorobenzene, m-dichlorobenzene, 1,2-dichlorobenzene, nitrobenzene, p-chloro-aniline, p-chloro-nitrobenzene, and 4-chlorodiphenyl in grass crap, and the t_R of test derivatives on the stationary phases of six kinds polarity. The monodic regression equation (Type I Eq.) of BCF and t_R and the binary regression equation (Type II Eq.) of BCF, t_R and ¹X^V were established, and the statistical test showed that there was a significant correlation between BCF and t_R, and the average correlation coefficients on stationary phases of six kinds polarity were 0.952 and 0.965, respectively. The regression equations could be used to estimate the BCF of the benzene derivatives in grass crap, and the results were not affected by the polarity of stationary phases.

Key words: Trawl fishing, Marine ecosystem, Trophic index, Composition index