STUDY ON 50 MHZ ICP TORCH WITH MEDIUM RESOLUTION SPECTROMETER - DETERMINATION OF RARE-EARTH ELEMENTS IN COMPLICATED MATRICES

ICP-OES is a suitable method for the determination of R.E.E. (rare ear th elements), which exhibits advantages in the absence of interference s of evaporation, low detection limits and a great linear range of cal ibration graphs. A spectrometer having spectral bandwidth (SBW) 30 pm with the 50 MHz ICP source were used. Optimum working conditions resul ted from detailed studies of axial intensity distributions. Difference s in axial intensity distribution were evident when compared with usua l 27.12 MHz ICP sources. Matrix interferences of alkaline salts and ac ids have been evaluated and the optimum spectral lines selected respec ting mutual spectral interferences of R.E.E.