Platinum and rhodium in wine samples by using voltammetric techniques
- Authors: Amorello, D.; Barreca, S.; Gulli, E.; Orecchio, S.
- Publication year: 2017
- Type: Articolo in rivista (Articolo in rivista)
- Key words: Pt; Rh; Voltammetry; Wine; Analytical Chemistry; Spectroscopy
- OA Link: http://hdl.handle.net/10447/280985
For the first time, the concentrations of Pt and Rh in 42 different alcoholic beverages (white and red wines, vodka and brandy) produced in Italy, Malta and Gozo were investigated. Only the voltammetric techniques, in particular, differential Pulse Voltammetry (DPV/a) and Adsorptive Stripping Voltammetry (AdSV) were used for the determination of Pt and Rh respectively. Accuracy was tested with standard addition method and recoveries ranged from 90% to 98%. In analyzed wine samples, Pt and Rh concentrations are in the ranges from 3 to 470Â Î¼gÂ LâÂ 1and from 0.0006 to 0.36Â Î¼gÂ LâÂ 1respectively. We found a Pt/Rh ratios ranged from 37 to 180,000, in quite disagreement with the ratio in catalytic converters. Unlike other investigated matrices (settled dust matter), the concentrations of Pt and Rh are not correlated, suggesting that the grape or the plant (vitis vinifera) treats the two metals very differently. Daily intakes (DIM) of Pt and Rh were calculated. Consuming 200Â mL/day of wine, this supply from 0.6 to 94Â Î¼g and from 0.00012 to 0.072Â Î¼g of platinum and rhodium for person respectively.