Nondispersive and Dispersive Atomic Fluorescence Spectrometry of Arsenic by Utilizing the Arsine-generation Technique

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Abstract
Atomic fluorescence spectrometry with nondispersive and dispersive systems by utilizing the arsine-generation technique is described for the determination of arsenic at the nanogram level, where the premixed argon(entrained air)- and nitrogen (entrained air)-hydrogen flames and a microwave-excited electrodeless discharge lamp were used. For the low-temperature flames, a newly designed burner has been constructed. The best detection limits obtained for arsenic are 2.3 ng in mass and 0.12 ppb in concentration with a nondispersive system in argon(entrained air)-hydrogen flame. Linear analytical working curves covering the mass range of arsenic from 30 ng to around 1000 ng have been obtained with nondispersive and dispersive systems at 193.7 and 197.2 nm in both the hydrogen flames. Several elements including other hydride-forming elements, such as antimony, bismuth, selenium, and tellurium, have caused a decrease in fluorescence signals. The present method, with the most sensitive nondispersive system and argon (entrained air)-hydrogen flame, can be applied to the determination of trace amounts of arsenic in wastewaters.
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