Abstract
Research has been carried out to enlarge the potential of infrared (IR) spectrometry as a detector in gas and liquid chromatography (GC and LC). The study has been directed to applications in environmental analysis. Examples of recently obtained results are presented. The analyte detectability of GC-IR has been improved by incorporation of an on-column interface for the introduction of large sample volumes. The feasibility of the technique is demonstrated by the identification of pesticides in water at a level of 0.5 μg 1 −1 using on-line desorption of pre-sampled solid-phase extracted cartridges. The detectability of LC-IR, based on solvent elimination interfacing, has been enhanced by on-line trace enrichment. The applicability has been extended to buffered aqueous mobile phases by on-line post-column liquid-liquid extraction into a volatile solvent, and to gradient separations by reduction of the analytical flow using capillary LC combined with post-column addition of a make-up liquid. With both techniques, herbicides have been identified in water samples in the low μg 1 −1 range.
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