Effect of sample preparation conditions on the determination of the total concentrations of unsymmetrical dimethylhydrazine in soilsстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Effect of sample preparation conditions on the determination of the total concentrations of unsymmetrical dimethylhydrazine in soils / A. D. Smolenkov, R. S. Smirnov, I. A. Rodin et al. // Journal of Analytical Chemistry. — 2012. — Vol. 67, no. 1. — P. 6–13. It is shown that, for a correct determination of the total concentration of unsymmetrical dimethylhydrazine (UDMH) in soil, it is necessary to consider the simultaneous presence of active products of its transformation, capable of hydrolysis to the parent compound, such as formic acid 1,1-dimethylhydrazide (FADMH). A comparative study is performed of the methods known in the literature for sample preparation to select conditions for the quantitative extraction of UDMH bonded by various mechanisms to organic and mineral fractions of soil, as well as FADMH as one of the most common active transformation products. It is found that the distillation with a 40% NaOH solution with an addition of Na2S enables the quantitative recovery of UDMH and FADMH from soils of all types and the determination of the maximum concentration of UDMH in the analysis of real samples of contaminated soils, which allows us to recommend this option to determine the total concentration of UDMH. © Pleiades Publishing, Ltd., 2012. [ DOI ]

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