Mr Evaluation of Lead (Pb) and Cadmium (Cd) Level in Selected Brands of Wine Using Stripping Voltammetry
2025
Umoren, Otoh | Okoyeaniche, Ekene | Lemeh, Ndubuisi | Adewale, Femi
This study reports on the determination of the concentrations of lead and cadmium in five samples of wine by stripping voltammetry using glassy carbon as working electrode, Ag/AgCl as reference and platinum as auxiliary electrode. The study was carried out in 0.16 M nitric acid containing 0.05 M potassium nitrate as supporting electrolyte. The accumulation of the metals in the wine samples was carried out at -900 mV for a period of 120 s under a hydrodynamic system and after a quiet time of 30 s, the stripping of the metals was carried out by scanning the potential from -900 mV to 200 mV. Lead was detected in a sample of St. Eves wine at a concentration of 3.9 µg/100 mL while cadmium was detected in Eva Fresh, Romex, and St. Lauren wine samples at concentrations of 9.3 µg/100 mL, 5.0 µg/100 mL, and 3.9 µg/100 mL respectively. The concentration of lead in the St. Eves wine sample (3.9 µg/100 mL) was below the maximum permissible limits of 10 µg/100 mL, while the concentrations of cadmium in Eva Fresh, Romex, and St. Lauren wine samples were above the maximum permissible limits of 1.0 µg/100 mL. The results have shown that caution should be exercised in the consumption of these locally made wines
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