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The suppressive interference of aluminum in the atomic absorption determination of calcium or magnesium has been commonly reported. Use of the high-temperature nitrous oxide-acetylene flame has also been shown to eliminate this interference. Prior to availability of this flame, use
of controlling or releasing agents such as Sr salts, La, La+ EDTA, Ca, and oxine have been employed to compensate for this effect. Further tests in this laboratory using a Perkin–Elmer model 303 spectrophotometer and a fuel-rich air acetylene flame have shown 1% (w/v) of ammonium citrate
or tartrate, oxalic acid, sodium nitrite, disodium EDTA, or sugar have little or no controlling action on aluminum at the pH of the dissolved salts. However, 0.5% (w/v) of hydroxylamine hydrochloride or 0.1% (w/v) of ethanolamine can compensate for 100-ppm A1 in determining 2-ppm Mg. Such
releasing agents apparently exert a preferential reaction with either the aluminum or magnesium in the flame, allowing the magnesium compound to dissociate and manifest the atomic absorption phenomenon.
Chemical Physics Research Laboratory, The Dow Chemical Company, Midland, Michigan 48640
Publication date: November 1, 1968
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)