论文部分内容阅读
一、引言元素在离子交换树脂上的吸附性能,通常以元素在该体系中的分配系数K_d(每g干树脂上吸附元素的量和与其平衡的1 ml溶液中该元素的量的比值)表示,而K_d=iE/ρ[i为树脂层的空隙率(0.38),ρ为湿树脂的密度(～0.45g干树脂/ml),E是淋洗常数,即淋洗平衡时,溶质在每块理论塔板上固液相之间的分配系数]与E直接有关。因此K_d是预期元素柱行为的一个重要参数。文献中有关阴离子交换的报道很少。Kraus给出了若干元素
I. INTRODUCTION The adsorption of elements on ion exchange resins is usually expressed as the partition coefficient of the element in the system, K_d (the ratio of the amount of adsorbed element per gram of dry resin to the amount of element in 1 ml of solution equilibrated with it) , While K_d = iE / p [i is the porosity of the resin layer (0.38), p is the density of the wet resin (~ 0.45 g dry resin / ml), E is the elution constant, Partition coefficient between solid and liquid phases on theoretical plates] is directly related to E. K_d is therefore an important parameter for the expected elemental column behavior. The literature on anion exchange is rarely reported. Kraus gives several elements