CALCIUM AS POTENTIAL DETERMINING ION IN AQUEOUS CALCITE SUSPENSIONS

被引:108
作者
PIERRE, A [1 ]
LAMARCHE, JM [1 ]
MERCIER, R [1 ]
FOISSY, A [1 ]
PERSELLO, J [1 ]
机构
[1] CTR RECH RHONE POULENC,F-69150 DECINES CHARPIEU,FRANCE
关键词
CALCITE; ELECTROKINETIC POTENTIAL; COMPLEXATION MODEL; CALCIUM AS A DETERMINING ION;
D O I
10.1080/01932699008943286
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electrokinetic mobility was measured on calcite particles dispersed in aqueous solutions as a function of pH, ion concentration and type (Na+, Ca2+, Cl-, SO4(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 Ca-2+ for the surface.
引用
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页码:611 / 635
页数:25
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