Concentration change of chioroaurate ion in the systems of chloroauric acid aqueous solutionsilica gel, -calcium carbonate and -activated carbon with time

Abstract

In the systems of chloroauric acid aqueous solution-silica gel, -calcium carbonate and-activated carbon, the concentration changes of chloroaurate complex ion in the sample solutions with time are examined and determined quantitatively during 61 to 71 days after the sample preparations in terms of inductively coupled plasma emission spectrometer.
As the results, kiesel-gel (230 mesh under) as an additive has large reduction capacity for chloroaurate complex ion in comparison with wako-gel (100 and 200 mesh) but calcium carbonate has not large reduction capacity. On the other hand, activated carbon (granule) has the largest reduction capacity such that chloroaurate complex ion is reduced perfectly to gold metal in a few days.