Abstract
A method is presented for the determination of traces of magnesium in alumina ceramics. After dissolution in an orthophosphoric acid-sulfuric acid mixture the magnesium is separated from the large excess of aluminum by cation exchange chromatography, using a 4% cross-linked resin and 0.50 M oxalic acid as eluting agent. Magnesium is finally determined by atomic absorption spectrometry using an acetylene-nitrous oxide flame. By use of Suprapur reagents and beakers made of Teflon, contamination can be reduced to ca. 2..mu..g with a variation between multiple blank runs of ca. 0.4 ..mu..g. About 3 ppm of magnesium in 1-g samples can be determined with approximately the same variation while larger amounts of magnesium (200-300 ppm in the alumina ceramics) show a variation of only +/- 1 ppm. 12 references, 1 table.
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