Basic investigations on background problems in the platinum-loop method in comparison to graphite-furnace and flame atomic-absorption spectrophotometry.
The platinum-loop method of flame-AAS/AES gives lower detection limits for volatile elements than conventional working modes of flame-AAS/AES. The background problems of the method are compared with those of the other AAS-techniques (flame- and furnace-AAS). In this initial study, the background spectra of two alkali-metal halides (NaCl, NaI) are investigated. It is found that for NaCl the intensity of the molecular background absorption is about 400 times greater in the furnace method than with the loop technique. In the short wavelength region of the spectrum (<220nm) Raleigh scattering is negligible in the loop method, compared with furnace-AAS.
Gücer
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Institut für Spektrochemie und angewandte Spektroskopie, Postfach 778, D-4600 Dortund 1, Federal Republic of Germany.
Berndt
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