BACKGROUND CORRECTION IN FREQUENCY-MODULATED SIMULTANEOUS ATOMIC-ABSORPTION SPECTROMETRY

For a long time simultaneous multielement determination by AAS has bee n a subject of intensive research. In this work a simultaneous multiel ement atomic absorption spectrometry method is described in a special new arrangement, called frequency modulated simultaneous AAS (FremsAAS ), using fiberoptics, interference filters and frequency modulation an d demodulation by lock-in amplifiers as main devices. Purpose of this work was to equip the FremsAAS with a D2-background correction and to test it with certified reference materials. Mn, Cd, Pb, Cu, Ni, Cr and Zn had been determined simultaneously (three at a time) in sewage slu dge (BCR/CRM 146), estuarine sediment (BCR/CRM 277) and phosphate rock (BCR/CRM 32) with good feasibility. Frequency modulated simultaneous AAS with background correction (FremsAASUK) represents an interesting alternative to known instruments.