Improved Analytical Method for Determining the Purity of Unsymmetrical Dimethylhydrazine

Capillary gas chromatographic internal standard method was used to determine the purity of unsymmetrical dimethylhydrine(UDMH) instead of the standard working curve method.Weakness of trace impouring imprecisely was avoided by using internal standard method.The results showed that the method has broad linear scope and the correlation coefficient for UDMH is 0.9959.The average recovery for the sample is 98.39% and standard deviation is 0.0015.In addition,this method had high accuracy and good repeatability.