A GC method was developed for the separation of gaseous chlorine in ai
r using a dual column switching system eluting to a thermal conductivi
ty 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 x 0.53 mm id), column with the separation of the permanent gase
s being achieved with a Molecular sieve 5A PLOT column (25 m x 0.53 mm
id). The resolution of oxygen, nitrogen and carbon dioxide in gaseous
samples provides an indication of chromatographic performance.