Kinetics characteristics of phosphate adsorption-desorption by Loessial soils were studied under the conditions of continuous liquid current. Phosphate was adsorbed and desorbed at different rates. According to the rate, the reaction of adsorbing-desorbing could be divided into three types: fast, middle and slow reactions. Elovich equation was the best model to decribe the adsorption and desorption of phosphate, while the first-order and parabolic diffusion equations were the worst; but the worst models were "sensitive" to the changes of reaction rate and could be used to classify reaction type and to study the reaction meachanism. The rates of adsorption and desorption were closely related to the soil clay and CEC. The influences of free Fe2O3 on adsorbing rate and CaCO3 on adsorbing rate under lower temperature and desorbing rate under higher temperature were siginficant. The rapiddly available phosphorus was an important factor to control the desorption rate. The rate of phosphate adsorption was significantly influenced by temperature, but the effect of temperature on the desorption rate was not significant. The adsorption and desorption rates, capacit, of phosphate and reaction time varied with soil types and horizons.
参考文献
相似文献
引证文献
引用本文
薛泉宏,尉庆丰,薛喜乐.黄土性土壤在连续液流条件下吸附、解吸磷酸根的动力学研究[J].土壤学报,1995,32(2):142-150. Xue Quanhong, Wei Qingfeng, Xue Xile. KINETICS OF PHOSPHATE ADSORPTION-DESORPTION OF LESSIAL SOILS UNDER CONTINUOUS LIQUID CURRENT[J]. Acta Pedologica Sinica,1995,32(2):142-150.