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Emission Spectrographic Determination of Selected Metals in Magnesium Alloys by the dc Arc-Powder Technique

Volume 32, Number 2 (April 1978) Page 212-215

Apsher, Alvin D.


A method is presented for the determination of trace quantities of tungsten, tantalum, niobium, molybdenum, vanadium, and chromium in magnesium alloys. In the procedure, the alloys are converted to their sulfates and excited by a 12 A dc are for 70 s in a Harvey Crater graphite electrode. Magnesium sulfate synthetic standards are used. Minimum detectable concentrations ranging from 1 ppm molybdenum and chromium to 20 ppm tungsten and tantalum are indicated. The standard deviations range from 2.9 ppm for tantalum to 9.9 ppm for tungsten at the 50 ppm concentration range.