1. Ion mobility spectrometry of hydrazine, monomethylhydrazine, and ammonia in air with 5-nonanone reagent gas.
- Author
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Eiceman GA, Salazar MR, Rodriguez MR, Limero TF, Beck SW, Cross JH, Young R, and James JT
- Subjects
- Ammonia analysis, Ammonia chemistry, Hydrazines analysis, Ions, Ketones chemistry, Monomethylhydrazine analysis, Environmental Monitoring instrumentation, Hydrazines chemistry, Monomethylhydrazine chemistry, Space Flight
- Abstract
Hydrazine (HZ) and monomethylhydrazine (MMH) in air were monitored continuously using a hand-held ion mobility spectrometer equipped with membrane inlet, 63Ni ion source, acetone reagent gas, and ambient temperature drift tube. Response characteristics included detection limit, 6 ppb; linear range, 10-600 ppb; saturated response, >2 ppm; and stable response after 15-30 min. Ammonia interfered in hydrazines detection through a product ion with the same drift time as that for MMH and HZ. Acetone reagent gas was replaced with 5-nonanone to alter drift times of product ions and separate ammonia from MMH and HZ. Patterns in mobility spectra, ion identifications from mass spectra, and fragmentation cross-sections from collisional-induced dissociations suggest that drift times are governed by ion-cluster equilibria in the drift region of the mobility spectrometer. Practical aspects including calibration, stability, and reproducibility are reported from the use of a hand-held mobility spectrometer on the space shuttle Atlantis during mission STS-37.
- Published
- 1993
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