THE INFLUENCE OF SAMPLE PREPARATION ON TH E ICP-AES DETERMINATION OF METAL CONCENTRATIONS IN WINE SAMPLES

A simultaneous multielement determination method (ICP-AES) was used fo r the analysis of wine samples. Because of the difficult matrix of the wine samples different sample preparation methods were compared: acid digestion in PFTE wessel under pressure and using microwave energy, e vaporation of the alcohol content using IR lamp and microwave oven, di lution of the samples. The results of ICP-AES measurements were evalua ted using F and T statistical methods. The recoveries for different sa mple preparation methods were measured after standard addition of all measured elements. The critical comparison of methods revealed differe nces between the sample preparation methods from the point of view of precision, reproducibility, accuracy and fastness.