DETERMINATION OF 1,1-DIMETHYLHYDRAZINE IN SOIL USING GAS-CHROMATOGRAPHY WITH OPEN-TUBULAR COLUMN AND SELECTIVE DETECTION

Model and real samples taken from sites of rocket weapon destruction w ere analyzed to compare analytical characteristics of procedures for t he determination of 1,1-dimethylhydrazine in soil by gas chromatograph y with nitrogen-phosphorus, flame-ionization, and mass-spectrometric d etection. 1,l-Dimethylhydrazine was extracted from soil samples by ste am distillation at high values of pH. 1,l-Dimethylhydrazine was determ ined as a derivative of p-nitrobenzaldehyde. The detection limits for gas chromatography with N-P, flame-ionization, and mass-spectrometric detection were 3, 10, and 8 mu g/kg, respectively, at a signal-to-nois e ratio of 3 : 1. For the determination of low concentrations of 1,1-d imethylhydrazine, the lowest error was observed in the results obtaine d with the use of an N-P detector. In soil samples, 7.9-8.1 mu g/kg of 1,1-dimethylhydrazine were found.