MICROANALYSIS OF IRON AND ALUMINUM-ALLOYS BY MEANS TIME-RESOLVED, LASER-INDUCED PLASMA EMISSION-SPECTROSCOPY

The preliminary results of quantitative analytical studies of iron and aluminium alloys by means of time-resolved laser-induced plasma atomi c emission spectroscopy are reported. Solid samples were evaporated an d plasma was produced by a low impulse-energy (10 mJ) Q-coupled Nd:YAG laser. Plasma emission was measured by a computer-controlled diode-ar ray detector unit situated behind a 0,3 m double monochromator. Alumin ium was analysed for Si, Mn, Fe; Cu and Mg, and iron for Si, Mn, Cr, N i and Al. The calibration curves were in all cases linear up to 2% all oying content. The detection limit was between 50 and 400 ppm (0,005-0 ,004%), depending on the element measured. The results allowed conclus ions concerning the improvement of detection limits and possibilities of studies on melts.