Enose Lab Made with Vacuum Sampling: Quantitative Applications

A lab-made electronic nose (Enose) with vacuum sampling and a sensor array, comprising nine metal oxide semiconductor Figaro gas sensors, was tested for the quantitative analysis of vapor–liquid equilibrium, described by Henry’s law, aqueous solutions organic compounds: three alcohols (i.e., methanol, ethanol, propanol) or chemical compounds different functional groups acetaldehyde, ethyl acetate). These followed fractional factorial design to guarantee orthogonal concentrations. Acceptable predictive ridge regression models were obtained training, RSEs lower than 7.9, R2 values greater 0.95, slopes varying between 0.84 1.00, intercept close theoretical value zero. Similar results test data set: 8.0, 0.96, 0.72 1.10, some intercepts equal In addition, total mass each solution could be predicted, pointing out that sensors measured mainly global contents vapor phases. The satisfactory allowed conclude Enose useful tool volatiles from containing which law is applicable.