Abstract：Benzo [a] pyrene (BaP) was one of the most important pollutants in the marine environment. To understand the bioaccumulation characteristics of BaP in Exopalaemon carinicauda and Portunus trituberculatus, the kinetic parameters (uptake rate constant (k1), elimination rate constant (k2), bioaccumulation factor (BCF), and biological half-life (B1/2) of the BaP bioaccumulation and elimination in crustaceans E. carinicauda and P. trituberculatus tissues were determined used the semi-static two-compartment kinetic model. The range of k1, k2, BCF, CAmax and B1/2was 12.34 to 24.96, 0.06 to 0.10, 208.41 to 248.03, 12.40 to 93.79ng/g, 6.89 to 11.71days, respectively, the average value of k1, k2, BCF, CAmax and B1/2 was 18.80, 0.08, 228.02, 129.07ng/g, 8.95days for BaP in the E. carinicauda tissues. And in the P. trituberculatus tissues, the range of k1, k2, BCF, CAmax and B1/2was 8.59to 66.20, 0.09to 0.19, 147.11to 171.79, 8.59 to 66.20ng/g, 3.65 to 7.70 days, respectively, the average value of k1, k2, BCF, CAmax and B1/2 was 22.55, 0.14, 158.11, 32.70ng/g, 5.43 days. It was found that the uptake rate constant (k1), elimination rate constant (k2) and bioaccumulation factor (BCF) in E. carinicauda and P. trituberculatus tissues generally decreased with the increase in BaP exposure concentration in ambient seawater, the CAmax, B1/2was increased with the increase in BaP exposure concentration in ambient seawater. The results showed that BaP could easily cause bioaccumulation in E. carinicauda and P. trituberculatus tissues, the bioaccumulation contents in E. carinicauda tissues was higher than in P. trituberculatus tissues, the bioaccumulation rate in early stage was higher than the bioaccumulation stage in later, where the release rate of BaP become slower in later stage.
