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Vapor mixture generation for infrared sensor evaluation

The use of the equilibrium vapor cell method quantitatively supplies one or more analytes in the presence of water vapor by using the vapor liquid equilibrium properties of aqueous solutions to delivery target vapors. This study demonstrates vapor generation of ammonia, ethanol, and ammonia/ethanol mixtures from aqueous solutions. Gravimetrically prepared aqueous solutions of ethanol and/or ammonia along with vapor liquid equilibrium data permits assessment of the mixed vapor target amounts delivered into an optical cell. Acquisition of the infrared vapor phase spectra is completed with a laboratory spectrometer for the target vapors in the Beer's law concentration region using a fixed pathlength optical cell. Even though ideal solution behavior is assumed for the ethanol/ammonia interactions in the ternary solutions, the infrared spectral results between the binary and ternary solutions are shown to compare favorably.