Cellulose xanthate cotton was used for enrichment and separation of Ag from bulk Os and Ru from 0.65 mol HNO3/L solution The adsorbed Ag was eluted with 8-10 4M HNO3. Submicrogram quantity of Ag can be enriched and separated from the cotton with a recovery of 98%. Trace Ag was determine on glass carbon electrode by anodic stripping voltammetry in the electrolytic system of 0.1 mol KSCN/L-0.2 mol HNO3/L-2.5 mol CyDTA/L. The linear range between the concentration and the peak current of Ag is 10-11 to 10-7 g/mL. The detection limit reaches 10 parts per trillion for 10 min electrolysis. The relative standard deviation is 4.2% for Os sample with 6 replicate detns. The results agree with those obtained by atomic absorption spectrometry.

Key words: SODIUM COMPOUNDS, SILVER, ANODIC-STRIPPING VOLTAMMETRID METHOD, CONCENTRATION, RUTHENIUM, ELECTROCHEMICAL ANALYSIS, PRECIOUS METALS, XANTHOGENATE, OSMIUM, CELLULOSE ESTERS