Measuring Trace Impurities in Air by Infrared Spectroscopy at 20 Meters Path and 10 Atmospheres Pressure

Abstract

Use of a new type of drying device achieves considerable selectivity in the removal of water from ambient air. The sample may then he compressed to 10 atm, without the separation of liquid water that would otherwise occur. Use of this higher pressure in a 20-meter gas cell permits the infrared spectral detection of many compounds of toxicological interest in the 0.05- to 1-ppm range.