Voltammetric determination of the stabilizing additives acardite II, centralite I and diphenylamine in propellants.
A method for the determination of the stabilizing additives Acardite II, Centralite I and diphenylamine in single- and double-base propellants has been developed, based on oxidative differential pulse voltammetry with a glassy-carbon electrode in a 1:1 v v acetonitrile-methanol medium. The voltammetric behaviour of Acardite II and Centralite I was briefly studied to find the proper experimental conditions. For analysis, aliquots of a crude sample extract in dichloromethane are added directly, with no prior treatment, to the measurement cell. The analysis is performed by the standard-addition method. The relative standard deviation is typically 1.0-1.5%. The concentration range accessible with the differential pulse technique, 0.5-100 muM, is quite sufficient for the levels of stabilizers used in powders and propellants. The utility of the method is exemplified by the monitoring of stabilizer consumption in three different propellants subjected to accelerated degradation at 90 degrees .
Bergens
A
A
Department of Analytical Chemistry, University of Uppsala, P.O. Box 531, S-751 21 Uppsala, Sweden.
Lundström
K
K
Asplund
J
J