Fig. 4.

Methanol detection with high ethanol interference. a Responses of the methanol detector upon exposure to 1 ppm methanol in the presence of 5 (green line), 650 (1% relative saturation, blue line), and 32,500 ppm (50% relative saturation, red line) ethanol. Corresponding ethanol breakthrough times (t_B, dashed lines) are indicated. b The ethanol t_B (squares and dashed line) and methanol retention time (t_R, circles and solid line) as a function of interfering ethanol concentration of 5 (green), 650 (1% relative saturation, blue), 6500 (10% relative saturation, orange), 32,500 ppm (50% relative saturation, red), and 62,000 ppm (95% relative saturation, purple)