The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.
Thermodynamic Stability of Alkaline Earth Oxides and Aluminates in Flame Spectroscopy
Volume 22, Number 6 (Dec. 1968) Page 790-791
Mansell, Ralph E.
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.