POTENTIOMETRIC STRIPPING DETERMINATION OF LEAD, CADMIUM, AND ZINC IN WINE

The determination of lead, cadmium, and zinc in wine by stripping pote ntiometry is described. The wines used in this study include red and w hite table wines, sparkling wines, and fortified wines. The stripping potentiometric methods for lead and zinc are rapid with analysis times per test sample of one minute or less. For cadmium, the low concentra tion in wine requires considerably longer analysis times of up to five minutes per sample. The precision of the stripping potentiometric met hods is high, with relative standard deviations being less than or equ al to 6%. The results compare favorably with those obtained by graphit e furnace atomic absorption spectrophotometry (lead and cadmium) and f lame atomic absorption spectrophotometry (zinc). The advantages of usi ng stripping potentiometry for the routine determination of lead, cadm ium and zinc in wine are identified.