Abstract
In order to improve the detection efficiency of 1,1-dimethylhydrazine in air by solution absorption/spectrophotometry method, some key factors were analysed, such as the absorption velocity and the number of large bubble absorber tubes. The results of this method were compared with that of Chinese national standard method under different concentration of UDMH. The results showed that two bubble tubes in series could meet the collection efficiency and the best absorption velocity was 0.2 L min−1. The standard deviation of the method was less than 5%, and the error of the method and the national standard method was less than 2%. The proposed method has the characteristics of simple operation, high precision and high reliability.
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