Measurement of radiation induced localized absorption in chromatographic eluents by means of the co laser and the PZT pyroelectric detector

摘要

Combined use of the CO laser and PZT piezoelectric detector is proposed as a sensitive and specific detector for gas chromatography. The feasibility of this detection scheme is demonstrated for a model mixture containing varying proportions ofacetone in water. After separation on a GC column, spectra of both constituents were recorded in the 1600 cm{sup}-1 to 1900 cm{sup}-1 range that encompasses the characteristic frequency of C=O bond in acetone. Reasonably high sensitivity (massconcentration limit is l.2×l0{sup}-8 g acetone) and a good degree (factor 530) of spectral discrimination was achieved by a proper selection of analytical wavelengths.