Add time:08/11/2019         Source:sciencedirect.com

The direct polarographic determination of dibutyl phthalate in propellant compositions containing nitroglycerine is not readily practicable by normal polarography because of the marked interference of the nitroglycerine which gives polarographic steps preceding those of the dibutyl phthalate, making quantitative work very difficult. This necessitates a preliminary Chromatographie separation of the nitroglycerine and dibutyl phthalate before polarography. Dibutyl phthalate can be determined directly in the presence of nitroglycerine by means of the cathode-ray polarograph. Up to a certain value of nitroglycerine there is an enhancement of the height of the peak used for the determination of dibutyl phthalate and this is accompanied by a gradual increase in the peak potential of the dibutyl phthalate. Above this value there is no further change so that it is ensured that the nitroglycerine content of the sample is above this level before carrying out the analysis. The accuracy of the method is of a good order.

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