镉"加标"沉积物对泥鳅(Misgurnus anguillicaudatus)生物毒性研究

选择泥鳅(Misgurnus anguillicaudaus)作为受试生物,以泥鳅死亡率、血液红细胞数量、红细胞体积、红细胞微核率和核异常率作为测试指标,考察了沉积物中"加标"金属镉(Cd)的毒性状况,探讨了水体沉积物中重金属的生物毒性影响.结果表明:高有机质的粘土粉砂性沉积物能够有效吸附重金属镉;镉加标暴露组泥鳅的死...

Bio-toxicity of Cadmium-spiked Sediments to Misgurnus anguillicaudatus

In order to reflect the toxicity of cadmium (Cd) in the water\|sediment system, the toxicological parameters including mortality, micronucleus and nuclear anomalies in erythrocytes of loach (Misgurnus anguillicaudatus ) after exposure were quantified. Results show that sediment mainly composed of clay and silt with high content of organic matter could effectively adsorb the spiking cadmium. The mortality and the frequency of micronucleated erythrocytes and the rate of nuclear anomalies of the loans exposed to sediment after cadmium spiking were all significantly higher than those in control (p<0.05). According to the data analysis, the median lethal concentrations of cadmium in the water\|sediment system were 2.8037, 2.4997, 2.2705 and 1.7538 mg·g-1 dry weight at 24, 48, 72 and 96 hours, respectively. The frequency of micronuclei and nuclear anomalies were sensitive to ambient pollutants and could be used to monitor the aquatic environmental quality.