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Gallium content in seaweeds
Authors:Toshio Yamamoto  Yukiko Otsuka  Kazuyo Uemura
Institution:(1) Department of Chemistry, Kyoto University of Education, Fushimi-ku, 612 Kyoto, Japan;(2) Seibo Gakuin, Fushimi-ku, 612 Kyoto, Japan
Abstract:Analyses of gallium content were made by the fluorometric method on 57 samples of seaweeds which were composed of 30 species. As the result of it, the gallium content was found ranging from 0.02 to 0.64Mgrg g–1 and the average was 0.14Mgrg g–1 in the dried seaweeds.Generally, the gallium content in seaweeds had a close relationship to the aluminium and iron contents. The average weight ratio of Ga/Al was 3.8×10–4 and one of Ga/Fe was 4.0×10–4. The average Ga/Al weight ratio (3.8×10–4) was very similar to that reported for shallow-water deposits (2.1×10–4), but was definitely lower than that in sea water (1.5×10–2).
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