Abstract
A method has been developed for the determination of gallium in environmental samples at the level of 0.069-58 ..mu..g/g by graphite furnace atomic absorption spectrometry using nickel matrix modification. The sensitivity for determining gallium was improved by a factor of 6 in the presence of nickel as compared to that of pure gallium standard. The related mechanism of enhancement effect is discussed. The suppression effect of perchloric acid on the determination of gallium was probably due to the formation of GaCl originating from the condensed phase reaction at low HClO/sub 4/ concentration and the vapor phase reaction would also be recognized to occur at higher HClO/sub 4/ concentration. 17 references, 7 figures, 4 tables.
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