Determination of gallium in geological materials by graphite-furnace atomic-absorption spectrometry.
A graphite-furnace atomic-absorption spectrometric method has been worked out for the determination of traces of gallium in silicate rocks and minerals. The samples are opened up by fusion with a lithium carbonate-boric acid mixture and the cake is taken up with 2M nitric acid. Addition of nickel nitrate to this solution elminates the severe matrix effects allowing gallium solutions in nitric acid to be used as calibration standards. No separations are necessary. Results are quoted for 14 standard silicate rocks and two minerals. The RSD is 2.9%, and the sensitivity is 27 pg of gallium for 1% absorption.
Takekawa
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F
Laboratory for Analytical Chemistry, Faculty of Engineering, University of Chiba, Yayoi-cho, Chiba, Japan.
Kuroda
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R