The Analysis of Explosives by JehudA. Yinon, Shmuel Zitrin, R Belcher, D Betteridge and L

By JehudA. Yinon, Shmuel Zitrin, R Belcher, D Betteridge and L Meites (Auth.)

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295) suggested the following tests for nitroaromatic compounds: a) Addition of the nitro compound to molten DPA or 4,4'-di (dimethylamino)diphenyl ("tetrabase") produced colored products. b) Reduction of the nitroaromatic compound (electrolytically or with Zn/CaC1 2) to the corresponding nitruso derivative which was then identified by its color reaction with sodium pentacyanoamine ferroate Na3[Fe(CN)51H 3I. c) Reduction of the nitroaromatic compound (with zinc in a weak acid solution) led to the corresponding arylhydroxylamine which reacted with Na3[Fe(CN)51H 3], forming violet products.

The complex formation was explained (Malliken, 1950; Milliken and Orgel, 1957) by polarization of the nitro group. The complexes, having hybrid structures, could be represented as follows: E-- ; N ~Z otN — Ar N~2 The interactions of polynitroaromatic compounds with aromatic amines or hydrocarbons were extensively studied by Foster and Hammick (1954). Sharma and Tewari (1974) reported spot tests and spectrophotometric determinations of some nitroaromatic compounds (including m-DNB and TNB) based on their colored p complexes with 1,1-diethylaniline in chloroform.

The color was allowed to develop for 45 minutes before being measured spectrophotometrically. , 1959) for the colorimetric determination of RDX and HMX in admixtures, due to different slopes of Beer's law (see chapter 10) curves for the two explosives. The reactions of RDX and HIX in concentrated sulfuric acid and the applications to colorimetric and titrimetric determinations of the two explosives by the "brown ring" reaction, were studied by Simecek (1961). Reduction of nitrate esters with various reducing agents formed the basis of many titrimetric determinations of nitrate ester explosives (Becker and Shaefer, 1954, p.

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