IR Absorbance Measurement of Variable Composition Aqueous VOCs

Quantitative infrared (IR) absorbance spectra are compiled, which rely on the equilibrium-vapor cell method for generating controlled amounts of target analytes. The target analytes are the solutes of variable composition aqueous solutions of volatile organic compounds (VOCs). The VOCs investigated in this study are acetone, 2-butanone, ethanol. isopropanol, and methanol. Tbe resulting vapor liquid equilibrium for the variable composition solutions provides analyte vapor concentrations in the Beer's law range of IR absorbance. Gravimetric solution preparation is documented with the actual solute and solvent weights for the VOC solutions necessary to generate the targeted vapor pressures and concentrations.