Direct potentiometry properties

Titrimetric methods with potentiometric end point location can be applied when an electrode with the needed selectivity is not available. The precision and accuracy of potentiometric titrations are superior comparing it with the properties of direct potentiometry. However, the concentration range where potentiometric titration can be used effectively is narrower. A solution with analyte concentration below 1 mM seldom is determined by potentiometric titrations. Potentiometric end point location is most often employed in the case of acid-, base-, precipitate-, redox-, or complexometric titrations. 

In addition, b is directly related to the conformation of the polymer viz. single or double chain helix formation inplies a decrease of the length b. This hehcal conformation, which often exists in stereoregular polysaccharides, is stabilized by an intrachain and interchain H-bond network. Thus, the study of electrostatic properties will help to characterize the conformation of these polymers as a function of the experimental conditions (pH, ionic concentration, tenperature) [8, 9]. One of the most useful expaiments is the determination of the activity coefficient of counterions (y) obtained by potentiometry (or conductimetry). Its theoretical value is directly related to the charge parameter and the valence of the counterion. The main relations, when X. is higher than unity, are ... 

Compared with potentiometry, voltammetric methods provide more rapid and direct measurements of redox properties, and a wide range of electrode potentials can be applied, often extending well beyond the thermodynamic limits of water (<—0.4 V and >0.8 V vs the Standard Hydrogen Electrode (SHE), at pH 7). Active sites having very high or very low potentials may be difficult to study by... 

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