镉在土壤中释放的动力学特征研究

Study on the characteristics of kinetics of cadmium release in soil

采用间歇法研究了镉在不同土壤中释放的动力学特征。结果表明 ,酸性土壤镉释放速率大于石灰性土壤 ;随温度升高 ,石灰性土壤镉平均释放速率下降 ,而酸性土壤镉平均释放速率增加 ;不同温度下土壤镉释放速率 V与时间 t最优模型为 ln V=A+ Bt;不同土壤镉释放量 S与时间 t的较优模型为 ln S=A+ k/

Kinetics of cadmium release characteristics in different soils was studied using the Batch Techniques.The rates of cadmium release from the acid soils were bigger than the calcareous soils.The average rates of cadmium release from the calcareous soils decreased as the temperature increased, but for the acid soils, the rates increased.The optimum model of the rates of cadmium release with the time accorded with ln V=A+Bt ;for different soils, the amount of cadmium release with the time accorded with the model ln S=A+k/t .