Abstract
A conductometric method is proposed for the determination of graphite in propellants. The method is applicable to the semimicro and macro range. A sample containing up to 0.7 mg of graphite is dissolved in 10 ml of nitric acid by heating on the steam steam bath. If tin is present, 3 drops of hydrofluoric acid are added to prevent the precipitation of metastannic acid and the occlusion of organic matter. The solution is filtered through a small Gooch crucible wrapped in aluminum foil to prevent contamination by tarry matter from the adapter. The Gooch is washed with hot dilute nitric acid (1:1), water, acetone, and again water; it is done in that order. It is then heated at 900 °–1000 °C in a ceramic tube in a current of oxygen, and the carbon dioxide is determined conductometrically with the use of a Leco Conductometric Carbon Determinator. Such factors as the best means for dissolving the sample, possible segregation, preparation of calibration curve, mechanism of the combustion, and interferences are considered.
Published Version
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