Abstract
A rapid electrographic determination of magnesium in magnesium-aluminum or magnesium-nickel alloys and zirconium in zirconium-nickel alloys was worked out. The method consisted of the stripping of alloy constituents into a filter paper moistened with a supporting electrolyte solution and the subsequent measuring of the intensity of color developed on the paper spectrophotometrically. Suggested electrolyte solutions were 0.5 M sodium potassium tartrate for magnesium alloys and 0.5 M NH4Cl for zirconium alloys. After electrographic stripping (4 V, 10 mA, 10 sec for magnesium and 20 sec for zirconium) of the alloy constituents into the filter paper under a pressure of 2 kg per 6.25 cm2, the filter paper was treated with a saturated ethyl alcohol solution of quinalizarin for magnesium and with an ethyl alcoholic solution of 0.5% alizarin for zirconium to develop the colored pattern to be measured at 560 mμ and 510 mμ, respectively. The method seems to be of special value for a rapid and practically non-destructive determination of magnesium and zirconium in their alloys.
