2.2.3. Construction of Calibration Curve by Colorimetric Response to Acetaldehyde Vapor

The C2H4O vapor detection was performed using different glass vials in which 10 mL of C2H4O was added at different concentrations in CH3OH solvent: 100, 300, 500 and 1000 ppm, respectively, on the vial's neck. The deposited filter paper pieces were fixed in order to expose them to the vapor evaporated from each C2H4O/CH3OH solution for 5 min. After this time, the paper was immediately removed and analyzed by a scanner (Samsung SCX-3400 series (USB002)) in order to acquire the color changes after C2H4O interaction.
