“…The nitric acid solution of the alloy was evaporated in the presence of oxalic acid crystals, the residue was ignited, and the calcium was extracted with water and subsequently was precipitated as oxalate at pH of about 5 and ignited to calcium oxide. Karaoglanov (163) reported that calcium could be separated very nicely from magnesium over certain concentration ratios if considerable excess of oxalate was used and the calcium oxalate was filtered after one hour. While filtering was difficult, there was no appreciable interference from magnesium.…”
RECENT years there has been marked interest in instrumental analysis as compared to volumetric and gravimetric methods. Strong (314) states, "The fact that 50% of 1946 analytical papers are on instrumental methods of analysis in-157
“…The nitric acid solution of the alloy was evaporated in the presence of oxalic acid crystals, the residue was ignited, and the calcium was extracted with water and subsequently was precipitated as oxalate at pH of about 5 and ignited to calcium oxide. Karaoglanov (163) reported that calcium could be separated very nicely from magnesium over certain concentration ratios if considerable excess of oxalate was used and the calcium oxalate was filtered after one hour. While filtering was difficult, there was no appreciable interference from magnesium.…”
RECENT years there has been marked interest in instrumental analysis as compared to volumetric and gravimetric methods. Strong (314) states, "The fact that 50% of 1946 analytical papers are on instrumental methods of analysis in-157
“…It has been clearly shown (I, 3, 5, 6, 7) that in magnesium-calcium ratios (by weight) of 1 to 1 or lower a better separation is attained by slow neutralization of an acid oxalate solution than by addition of oxalate to a neutral solution. In this case, sufficient oxalate according to Figure 2 is not always added and it is necessary to depend upon supersaturation to keep magnesium oxalate from precipitating (4).…”
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