1973 Volume 46 Issue 9 Pages 2758-2761
An attempt was made to estimate the amount of the cationic complex MA+ adsorbed on a cation exchanger. This method is based on the fact that the ratio of the distribution coefficients of M2+ and MA+ should vary with the ionic strength of the medium. The Ni(II) acetate system studied by Fronaeus has been reexamined. The results show that the distribution coefficient of NiAc+ (Ac=acetate) is negligible compared with that of Ni2+ upon the variation of the ionic strength from 0.2 to 1.0. It was found that Fronaeus overestimated the distribution coefficient of NiAc+ and that this caused the value of β2 to be much greater. In conclusion, the two functions, \varphi1 and f, introduced by Fronaeus could not be determined with high accuracy; for the stability constants obtained by Fronaeus’s method, they must be confirmed by conducting the experiment at a different ionic strength.
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