受钙、锌影响硼在酸性紫色土中的吸附特征

酸性紫色土对硼的等温吸附-解吸和吸附动力学试验表明，硼的等温吸附符合Frendlich方程，根据方程的K值（0．441），供试土壤对硼的吸附较弱。锌与硼复合，对土壤硼的吸附量和解吸量影响均不大，但吸附强度下降。钙则大大地提高了土壤对硼的吸附量和吸附常数，使土壤硼平均吸附量提高191．9％，并使平均解吸率下降6．4％。土壤吸附硼的动力学以Elovich方程（Ct=a＋blnt）描述最佳，反映土壤对硼吸附速率大小的方程参数b值以B＋Ca〉B＋Ca＋Zn〉B＋Zn〉B，钙对硼的吸附速率影响比锌的作用更强。

Effects of calcium-zinc on the thermostatics and kinetics of boron in acid purple soil

Results of thermostatic adsorption and desorption experiments indicated that adsorption of boron by acid purple soil was fitted by frendlich equation,and the values of K related to adsorption strength in the equation showed that the adsorption strength of boron was weak by sample soil.Addition of Zn in the solution had little effects on the adsorption and desorption of B,but reduced the adsorption strength of B.By the contrast,the adsorption amount of B increased by 191% as well as the adsorption constant K while the desorption of B decreased by 6.4% as adding Ca in the solution.The best fitness of the Elovich equation was achieved about describing the adsorption kinetics and the equation parameter(b) supposed that Ca affected B adsorption velocity much stronger than Zn did.The constant b value for different treatments followed in the order B Ca>B Ca Zn>B Zn>B.