Reductive Determination of Gold at Carbon Paste Electrode Using Constant-Current Stripping Analysis
Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Pardubice
The paper deals with the reductive determination of gold in soil samples at the carbon paste electrode with tricresyl phosphate using constant-current stripping analysis. Gold was accumulated at a potential of +800 mV as tetrachloroaurate and then reduced at a constant current (-3 mA) to Au(0). The interference of Fe(III) present in mineralized samples in large excess was overcome by addition of a fluoride to the measured solution. The standard addition method was used to evaluate unknown concentrations. Precision of the method was checked by determination of recovery of Au spiked into a real matrix. A comparison of the results with those obtained by AAS showed no statistically significant differences.
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