不同温度与时间条件下狭叶香蒲吸收Cd^2＋的动力学特征

研究了狭叶香蒲对Cd^2＋的吸收动力学特征。结果表明,狭叶香蒲对Cd^2＋的吸收基本符合M ichaelis-Menten动力学模型;高温下狭叶香蒲对Cd^2＋吸收的内在潜力大,但根系吸收位点对Cd^2＋的亲和力较小;高温下短时间内对Cd^2＋的吸收速率较快,但随时间延长则变慢,低温下的表现正好与高温下的相反;用V-C图解法和LB图解两种方法求解的Vmax均以24h＋30℃处理的最大,而24h＋10℃处理的最小;时间和温度同时影响离子吸收;用两种方法求动力学参数,虽然分析结果有差异,但相关性均较好。

Study on Cadmium Uptake Kinetics of Typha angustifolia under Different Time and Temperatures

The Cd2+ uptake kinetic characteristics of Typha angustifolia under the conditions of different time and temperatures were studied.Results showed the characteristics of absorption basically followed the Michaelis-Menten model.At high temperature,the Cd2+ absorption potentiality of T.angustifolia was strong,while the affinity at the uptake sites of root for Cd2+ was weak.The Cd2+ absorption rate increased under the short time and high temperature,when the treatment time prolonged,the Cd2+ absorption rate got slower,while in low temperature the results were opposite.Using V-C and LB graphical approach method,the value of Vmax was the highest in the treatment of 24 h+30 ℃,while that in the treatment of 24 h+10 ℃ was the lowest.The results showed that the Cd2+ absorption rate was influenced by treatment time and temperature.By the two different ways,the results showed the difference of the uptake kinetic mechanisms was significant,but it related well.