Sorption-chromatographic determination of hydrazine and its substituted derivatives in air

Working conditions were found for the chemisorption preconcentration of hydrazine, phenylhydrazine, and 1,1-dimethylhydrazine from air with tubes containing silica gel with immobilized 4-chloro-5,7-dinitrobenzofurazan and the subsequent determination by high-performance liquid chromatography with di...

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Bibliographic Details
Published in:Journal of analytical chemistry (New York, N.Y.) N.Y.), 2006-09, Vol.61 (5), p.452-457
Main Authors: Evgen’ev, M. I., Evgen’eva, I. I., Garmonov, S. Yu, Ismailova, R. N., Belov, P. E.
Format: Article
Language:English
Subjects:
Chemisorption
Dimethylhydrazines
High performance liquid chromatography
Liquid chromatography
Silica gel
Sorbents
Sorption
Thickness
Tubes
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Summary:Working conditions were found for the chemisorption preconcentration of hydrazine, phenylhydrazine, and 1,1-dimethylhydrazine from air with tubes containing silica gel with immobilized 4-chloro-5,7-dinitrobenzofurazan and the subsequent determination by high-performance liquid chromatography with diode array detection. A recovery of 98% (hydrazine), 90% (phenylhydrazine), and 97% (1,1-dimethylhydrazine) is attained at a thickness of the sorbent layer of 2 cm, an aspiration rate of 0.2–0.8 L/min, and a volume of aspirated air of 10 L. Silica gel with a particle size of 0.1–0.3 mm impregnated with 4-chloro-5,7-dinitrobenzofurazan (2 wt %) was used as the sorbent. The detection limits of compounds without regard for preconcentration after their desorption are 0.01 (hydrazine), 0.017 (1,1-dimethylhydrazine), and 0.015 mg/m3 (phenylhydrazine).
ISSN:1061-9348
1608-3199
DOI:10.1134/S1061934806050042