Determination of gold using clay modified carbon paste electrode

Sorption of gold(III) chlorocomplexes was studied by means of a carbon past e electrode modified with montmorillonite, Anionic exchange behavior was fo und in chloride media with low ionic strength. Anionic sorption of [AuCl4]( -) can be used as a preconcentration step to the determination of Au(III). Linear calibration dependences were found in the concentration range 4.06 x 10(-6) - 1.22 x 10(-5) mol/L Au(III) after 5 min of sorption and in the ra nge 8.12 x 10(-7) - 6.1 x 10(6) mol/L after 10 min of sorption. Interferenc es of several anions and cations were studied. Model samples of table water were analyzed.