A preliminary evaluation of a simple (bare) quartz tube trap for collection of SbH 3 and for volatilization of trapped analyte with subsequent atomization in a multiple microflame quartz tube atomizer (multiatomizer) for atomic absorption spectrometry is presented. The influence of relevant experimental parameters on the collection/volatilization efficiency was investigated. The parameters studied were: collection temperature and time, volatilization temperature and flow rates of air and hydrogen for the volatilization. Under optimized conditions, the collection/volatilization efficiency was 65%. For the collection time of 120 s (sample volume of 8 ml), the detection limit was 3.9 pg ml 21 , and the analytical plot was linear up to 1.25 ng ml 21 . Possible ways of improving the performance of the set-up as well as the collection/volatilization efficiency are suggested.

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The analytical performance of three trap systems for flame AAS were evaluated for determination of Cd and Pb in waters. In addition to a water-cooled U-shaped silica trap, two other novel traps, namely, a water-cooled U-shaped silica trap combined with a slotted silica tube and a slotted silica tube trap were used. Flame alteration and organic solvent aspiration techniques were two atomization techniques introduced in this work. The slotted silica tube trap with either flame alteration or organic solvent aspiration was found to be the most sensitive, effective and simplest device. For a collection period of 2.0 min, sensitivity enhancements, compared to flame AAS, were 137 and 90 folds for Cd and Pb, respectively, using the slotted silica tube trap and organic solvent aspiration technique.

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