Zero point charge measurement procedure

Zero Point Charge (ZPO measurements. Potentiometric titration of samples (3.0 g) was carried out in an aqueous suspension (500 ml electrolytic KNO3 solution) according to the procedure reported by Parks (24),... 

The above considerations indicate some different areas of research activity in the field of the electrical interfacial layer. The state of the art in this field is far from that which is common in solution chemistry. The problem is that the situation in the interfacial region is so complicated that one is forced to introduce substantial simplifications in the course of the modelling procedure . In addition, the situation is sometimes unknown, so that one should introduce several hypotheses in treating the interfacial equilibria. With respect to the solution chemistry, the experimental data are significantly less accurate and reproducible so that several different models cannot be separated and may coexist. The choice of model used in an interpretation would depend on the taste and ability of the author. In this field it is an achievement to understand the phenomena on a semiquantitative basis in some cases it is possible to recalculate the measurements, but data acquisition is left for the future. It would be desirable to standardise the interpretation and to produce tables with equilibrium parameters, e.g. for different oxides in order to predict their properties under different conditions (temperature, pH, electrolyte concentration, etc.). In fact, the poor reproducibility of experimental systems leads to scattering of results, even for such simple characteristics as the point of zero charge [1,2]. The apparent advantage of the described state of art lies in the fact that experimental data can be fitted... 

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