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.