Acute Toxicity Tests of Four Heavy Metal Salts to Juvenile Snail of Babylonia lutosa

The acute toxicity of four heavy metals to juvenile snails of Babylonia lutosa were studied at water temperature 16-23℃, salinity 30 and pH 8.0. The results showed that the LC50 values of CuSO4·5H2O treatment for 24h, 48h, 72h and 96h were 2.596, 1.037, 0.690 and 0.400 mg·L-1, respectively. The LC50 values of ZnSO4·7H2O treatment for 24 h, 48 h, 72 h and 96h were 16.384, 4.738, 3.225 and 2.721 mg·L-1 respectively. The LC50 values of CdCl2 treatment for 24 h, 48 h, 72 h and 96h were 17.286, 7.340, 3.799 and 2.361 mg·L-1 respectively. The LC50 values of Pb(NO3)2 treatment for 24h, 48h, 72h and 96h were 650.640, 410.595, 262.342 and 141.525mg·L-1 respectively. The safe concentration of four heavy meals to juvenile snails of B. lutosa were 0.040, 0.272, 0.236 and 14.153 mg·L-1 respectively.The safe concentration of four heavy metals ions to juvenile snails of B.lutosa were 0.010,0.062,0.148 and 8.501 mg·L-1 respectively.The toxicity was in the order of Cu2+>Zn2+>Cd2+>Pb2+.