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RESEARCH PRODUCT

Polarographic and voltammetric methods for the determination of elements

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Measurements of the correlations between current, voltage and time, when microelectrodes are used, yield qualitative and quantitative information on the elemental composition of the solution investigated, if the method of measurement is properly chosen. Instrumental development today makes it possible, even at electrodes which make measurement difficult, such as the classical dropping mercury electrode, to obtain more reliable information on detection limits and number of elements detectable, by taking into account the functional interdependence of interference parameters and signal generation. Simultaneous determination of several components is possible, especially with non-linear a. c. polarography. If particular electroanalytical methods are combined with separation and precon-centration steps (e. g. electrolytic or solvent extraction), the sensitivity and selectivity of the determination are considerably increased.