DIRECT-INJECTION OF AQUEOUS SAMPLES INTO GAS-CHROMATOGRAPHIC COLUMNS

The paper reviews state of the art of a technique of direct aqueous in jection (DAI) of samples into capillary columns. A classical procedure , described by Grob. for determination of halogenoorganic compounds in water based on direct aqueous injection (DAI-GC-ECD) is presented and advantages and limitations of the technique are commented. New areas of DAI method application are shown including determination of substan ces for which solvent and gas extraction techniques are not effective. DAI technique application can be extended to ''difficult'' samples af ter their matrix simplification by distillation or a specified thin la yer head space version in which an aqueous concentrate of organic poll utants is produced.