CALCIUM AS POTENTIAL DETERMINING ION IN AQUEOUS CALCITE SUSPENSIONS

作者：André Pierre, J.M. Lamarche, René Mercier, A. Foissy, Jacques Persello · 发表于：Journal of Dispersion Science and Technology · 年份：1990 · DOI：10.1080/01932699008943286 · 被引用次数：148 · 研究领域：Electrostatics and Colloid Interactions、Geophysical and Geoelectrical Methods、Microfluidic and Bio-sensing Technologies

Electrokinetic mobility was measured on calcite particles dispersed in aqueous solutions as a function of pH, ion concentration and type (Na+, Ca2+, CI-, S04 2-). Whatever the pH value, experimental results show a good correlation between electrokinetic potential and Ca2+ activity. Considering Ca2+ as a potential determining ion and using a simple complexation model at the surface, we show that the displacement of the isoelectric point can be attributed to the relative affinity of CO3 2- and Ca2+ for the surface.