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The content of diphenylamine in standard powder is determined by pure diphenylamine as external standard substance in this paper, the value of relative deviation is in the range of ±3%. The method was applied to the analysis of samples of powder, the vales of RSD (n=6) were found to less than 3%,and the results obtained were in conformity with those by standard powder method .The method has compensated the shortcomings by the standard powder as external standard substance. The method has showed the features of simple and rapid in operation, good in safety, and high in precision and accuracy.

Determination of Diphenylamine in Powder by Pure Diphenylamine as External Standard Substance