Extraction photometric determination of yperite by phthaleins

Extraction spectrophotometric determination of sulfidic yperite, based on the reaction with four phthaleins, was developed. The method is technically simpler than the determination of yperites with reagent T-135 (alkaline-aqueous ethanolic thymolphthalein solution) because it does not require heatin...

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Bibliographic Details
Published in:Talanta (Oxford) 1999-01, Vol.48 (1), p.163-171
Main Authors: Halámek, Emil, Kobliha, Zbyněk
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Phthaleins
Spectrometric and optical methods
Spectrophotometric determination
Yperite
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Summary:Extraction spectrophotometric determination of sulfidic yperite, based on the reaction with four phthaleins, was developed. The method is technically simpler than the determination of yperites with reagent T-135 (alkaline-aqueous ethanolic thymolphthalein solution) because it does not require heating at 80°C, cooling and acidification of the reaction mixture. Selection of the appropriate phthalein, and particularly optimization of the reagent composition and extraction of the coloured reaction product in chloroform, markedly increased the selectivity of the determination of yperites (HD, HN-3). The reaction is performed in a medium of increased polarity due to the low content of alcohol which enables the reaction to proceed at temperatures of 5–20°C without any marked loss of sensitivity. Using 1H and 13C NMR spectroscopy, the reaction products of HD and o-cresolphthalein were identified and an ionic mechanism for the reaction of HD with phthaleins is suggested.
ISSN:0039-9140
1873-3573
DOI:10.1016/S0039-9140(98)00235-5