Direct Elemental Analysis of Wines by Microwave Induced Plasma Optical Emission Spectrometry and Inductively Coupled Plasma Optical Emission Spectrometry

The paper presents procedures for the direct analysis of table wines by microwave induced plasma optical emission spectrometry (MIP OES) and inductively coupled plasma optical emission spectrometry (ICP OES) using matrix matched reference standards. K, Na, Ca, Mg, B, Si, Al, Fe, Cu, Mn, Ba, Sr, Li, and Zn are quantified from a single dilution with an relative standard deviation of no more than 10% (n = 2). The range of constant analytical signals upon varying the concentrations of potassium, alcohol, and sucrose during an MIP OES analysis is determined. No reduction in the background signal is demonstrated upon replacing nitrogen with air in the intermediate gas flow, and improved analytical performance is demonstrated using yttrium as an internal standard in MIP OES. The results are confirmed by capillary zone electrophoresis, spike experiments, and a comparison of the results of ICP OES and MIP OES analyses.