ATOMIC-ABSORPTION SPECTROMETRY WITH A FLAME EMISSION SOURCE

An atomic absorption spectrometer with flame atomization and a flame e mission light source is described. The light source is prepared by asp irating a solution containing a high concentration of analyte into the emission flame. Two different source flames (air/acetylene and nitrou s oxide/acetylene) have been evaluated, with the N2O flame providing b etter signal to noise ratios (S/N) in most cases. Source S/N values as high as 5900 (Cr) have been observed. Experimental parameters have be en optimized for nine test elements to give limits of detection obtain ed with this system that are in some cases as good as those obtained w ith the traditional hollow cathode lamp source; for example, Cu (4 ng/ ml), Mn (3 ng/ml) and Ni (5 ng/ml). Linear dynamic ranges typically sp an 2-3 orders of magnitude. This system offers an inexpensive emission source with the ability to quickly change the setup to accommodate di fferent analytes.