本文用三颈圆底烧瓶及比色法测定钻(Ⅱ)式交换树脂在不同浓度的氯化钙溶液中的交换扩散机理。在0.1N或较大时,粒子扩散控制速率。在0.02N或较小时,液膜扩散控制速率。在0.05N时,两种机理同时进行。交换速率随浓度的增加而增快至达一极限值。本法简便并足够准确。 In this paper, three-necked round-bottomed flask and colorimetric determination of drilling (Ⅱ) exchange resin in different concentrations of calcium chloride solution diffusion mechanism. At 0.1 N or larger, particle diffusion controls the rate. At 0.02 N or less, the liquid film diffuses to control the rate. At 0.05 N, both mechanisms operate simultaneously. The exchange rate increases with increasing concentration to a limit. This law is simple and accurate enough.