Abstract
Small amounts of formaldehyde dimethylhydrazone (FMDH) present as impurity in unsymmetrical dimethylhydrazine (UDMH) give a yellow color (λ max = 456 nm) on heating with excess of sulphuric acid; the detection limit is 50 μg ml − FDMH. Differences in the basicity of the two compounds in anhydrous acetic acid and in methanol are used to determine the two compounds in mixtures containing ⩾ 5% (w/w) FDMH.
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