采用过滤和切向超滤将黄河、长江和钱塘江水样分成＜ １ ．０μｍ ，＜ ０ ．４μｍ ，＜ ５０００Ｄａｌｔｏｎ （ 相当于１ ．５ｍｍ 孔径） 三个级分，分别对三个级分滤液与铅进行吸附络合反应的动力学进行了初步研究。黄河水样＜ １．５ｎｍ 超滤液与铅吸附络合反应呈快反应，＜ ０．４μｍ 和＜ １ ．０μｍ 的各级过滤液呈慢反应；长江和钱塘江水样各级滤液均呈慢反应。长江和钱塘江水样与铅反应存在络合竞争，反应速率取决于竞争离子络合物的解离速率；黄河水样则没有络合竞争。黄河水样＜ ０ ．４μｍ 和＜ １ ．０μｍ 的滤液与铅的络合反应速率由铅与胶体之间的反应决定，反应速率由液膜扩散控制。

The samples from the Huanghe River, the Changjiang River and the Qiantangjiang River were separated into three fractions: <1.0μm,<0.4μm, and <5000 Dalton(corresponding to 1.5nm) by filtration and crossflow ultrafiltration. The dynamics of interaction between lead and the three fractions was preliminarily studied. The complexing reaction in ultrafiltrates of the Huanghe River samples appeared fast, however, those in < 0.4μm and <1.0μm filtrates appeared slowly. For the Chanjiang River and the Qiantangjiang River samples, the reactions in all the filtrates and ultrafiltrates were slow. The complexation of lead in the Changjiang River and the Qiantangjiang River samples occurs in competition with that of other ions. The rate of the reaction is controlled by the dissociation of the complex between the rivalrous ion and the ligand. No competitive reaction occurred between lead with the Huanghe River samples. The rates of the reactions between lead and <0.4μm and <1.0μm filtrates of the Huanghe River samples were determined by the reaction between lead and colloid. The rate was controlled by liquid film diffusion.