黄河水中悬浮粒子对镉离子的交换吸附等温线

The adsorption exchange isotherms of the suspended particles on cadmium ion in the waters of Yellow River.

研究了黄河水中悬浮粒子对 Ｃｄ２ ＋ 的交换吸附等温线以及赖氨酸和门冬氨酸对吸附作用的影响．研究结果得到一类具有一个“拐点”、两个“平台”的新型河流等温线，用分级离子交换等温式求出平衡常数 Ｋ１ 和 Ｋ２ ．当低浓度的氨基酸存在时，对镉与悬浮粒子的交换吸附起促进作用．促进作用的程度与氨基酸的等电点有关，赖氨酸的促进作用较门冬氨酸大．

The isotherms of the interaction between Cd 2+ with suspended particles and the effects of lysine acid and asparaginic acid on the isotherms in the waters of Yellow River were studied by applying the theory and method of interfacial stepwise ion/coordination particle exchange. The isotherms of the interaction between Cd 2+ with the suspended particles were stepped, the whole curve was formed by two curve joined together with a 'plateau' in the middle. A new type of river isotherm was obtained. The adsorption equilibrium constants K 1 and K 2 were calculated by the isothermal equation of surface stepwise ion exchange. Where the amino acids existed, it had a promotion to exchange adsorption of Cd 2+ with the suspended particles. The promotion of lysine was bigger than that of asparaginic acid.