Quantitative analysis of chlorine in air by gas chromatography

A GC method was developed for the separation of gaseous chlorine in air using a dual column switching system eluting to a thermal conductivity detector. The limit of detection was found to be 3 ppm; the linear range up to 300 ppm. Initial separation was achieved with a PoraPLOT Q (25 m × 0.53 mm id), column with the separation of the permanent gases being achieved with a Molecular sieve 5A PLOT column (25 m × 0.53 mm id). The resolution of oxygen, nitrogen and carbon dioxide in gaseous samples provides an indication of chromatographic performance.