Accurate Determination of Gallium in South African Primary and Secondary Reference Samples by Ion Exchange Chromatography and Atomic Absorption Spectrometry |
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| Authors: | TN VAN DER WALT FWE STRELOW |
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| Institution: | National Chemical Research Laboratory, P.O. Box 395, Pretoria, 0001, Republic of South Africa |
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| Abstract: | Results are presented for gallium in six South African primary rock standards (NIMROCS) and in twelve secondary rock standards (SAROCS). A selective ion exchange procedure is used to separate gallium completely from all other elements, except remaining traces of thorium. It is followed by a determination of gallium with flame atomic absorption spectrometry using the nitrous oxide-acetylene flame, after the addition of 2000 ppm lanthanum as ionization suppressor. |
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