0000000000171055
AUTHOR
K. H. Bauer
Calculation of voltammetric peaks by the transformed Heyrovsky-Ilkovi? equation
Calculating real polarographic or voltammetric peaks is rather difficult. A new possibility to compute such peaks is the use of the transformed Heyrovsky-Ilkovic equation. The calculation allows to simulate polarograms or voltammograms by computer. Furthermore, it is possible to smooth voltammetric peaks without loss of peak height or separation of overlapping peaks.
Inverse-voltammetric determination of bismuth in biomaterials with computer assisted peak evaluation. part 3. Bismuth determination in wine, grapes and soil
The ultra trace element bismuth is regulary found in wine on an average of about 0.1 ppb. Very low bismuth contents were also determined in soil and different biomaterials. In spite of those very low quantities even speciation experiments show results, so far that about 90% of the bismuth in the grapes is water-soluble, resumably as saccharic acids. For detecting such low quantities a very sensitive method of differential pulse anodic stripping voltammetry was developped. The speciation experiments were carried out by fractional extraction.
Inverse-voltammetric determination of bismuth in biomaterials with computer assisted peak evaluation
The inverse-voltammetric determination of low bismuth concentrations in a 1 mol/l HCl as supporting electrolyte was investigated with regard to optimal working conditions. New and old types of mercury-drop electrodes and mercury-film electrodes were compared concerning their sensibility, selectivity and interferences. With both electrodes the determination of 0.1 μg/l to 0.01 μg/l bismuth is possible. The influence of a large excess of copper and antimony on the inverse-voltammetric determination of bismuth was studied in detail.