Determination of Oxygen in Calcium Metal

Abstract

Accuracy of this method has been tested with synthetics and found to be ±2.9% with 95% confidence limit for samples containing as little as 0.1% of fluorine. Duplicate determinations of catalysts and minerals showed a standard deviation of 1.2%.

Status of Methods for Determining Carbon, Oxygen and Nitrogen in Alkali Metals

“…The total carbon method of Kallmann and Liu may be • more generally applicable to the other alkali metals. (17) (34) (33) (3,22) (1) (31) (6) (1 0) (26) (13) In spite of the variety of methods proposed, it has been difficult to obtain agreement in results between any two methods .…”

“…Gahn (4) has reported that results obtained for samples of potassium can be varied by an order of magnitude by controlling the temperature of amalgamation. Application of the unmodified method to cesium and rubidium has been found to be impossible because of loss of oxygen ( 3). In view of these observations, it is not unreasonable to hypothesize that the amalgamation method may recover all of the oxide precipitated in the sample plus a fraction of any oxygen dissolved in the sample, that fraction depending on minor variations in the amalgamation technique.…”

Gas Analysis

“…Vacuum fusion of metals for oxy'gen content has been described (43,62,87,106,191,259,278,286,288,298).…”

Fluorometric Analysis

“…Aluminum. The reagent Pontachrome Blue Black R has been found successful for the direct determination of aluminum in sea water (11,9) and in beryllium (37). In the latter case iron is removed by extraction with methyl ethyl ketone.…”