SPECTROCHEMICAL DETERMINATION OF TRACE-ELEMENTS IN ALUMINUM PRODUCTS

We had to develop a solution method to perform parallel control measur ements in order to improve the analytical reliability of the spectrome ter. In the first step, we studied the possibility of dissolving the s ample. We concluded that acid mixtures usable for analyzing macroimpur ities and alloying elements cause considerable loss in such a concentr ation range when using an open system. For this reason dissolution sha lt be carried out in a closed system with a high pressure microwave de compositor. On the basis of preliminary measurements we knew the limit s of detection in AA and ICP spectrometry. Therefore we analyzed only alkaline elements directly from the sample solution by the flame photo metric method We performed the determination of the other elements aft er preliminary separation and preconcentration. Celluloses may be used as well as active carriers in separations. From among methods in the literature we chose the one which made it possible to separate nest of the elements. We determined II elements using the method with Hyphan cellulose. We constructed a hydride-cold vapor generator to determine hydride forming elements (As, Sb, Sn, Pb, Bi) and Hg, measuring even a Low concentration range on the order of a tenth of a mg/kg. We perfor med tests by solid sample optical emission spectrometry in parallel wi th our investigation in solution Our experience gained from parallel t ests are promising, backing up the applicability of these analytical m ethods.