Study on the Acute Toxicity of NO-2-N and S2- Acting on Procambarus clarkii Juvenile
亚硝酸盐和硫化物对克氏原螯虾幼虾的毒性效应研究

The hydrostatic test was used to research the acute toxicity of NO2--N and S2- acting on Procambarus clarkii juvenile. Test results show that the death rate of Procambarus clarkii juvenile rised evidently as the increase of the contact time with Laboratory reagent and concentration of NO2--N and S2-. The median lethal concentrations(MLC) of NO2--N for Procambarus clarkii juvenile of 24h, 48h, 72h and 96h were 108.09 mg / L, 90.08 mg / L, 73.02 mg / L and 69.74 mg / L, and the MLC of S2- for Procambarus clarkii juvenile of 24h, 48h, 72h and 96h were 12.96 mg/L, 9.57 mg/L, 7.62 mg/L and 4.63 mg/L, the safe concentration of NO2--N and S2- for Procambarus clarkii juvenile were 6.97 mg/L and 0.46 mg/L respectively, which were 35 times and 2.3 times for the corresponding water standands of the fisheries. Procambarus clarkii has a strong resistance to NO2--N and S2- in the capacity of water, and resistance to NO2--N was stronger than S2-.