Abstract
Conditions for direct analyses of various aliphatic compounds in water by the recently developed steam carrier gas chromatography (SCGC) were studied using a hydrogen flame ionization detector and acid washed Chromosorb P modified with 3.5 ± 0.3 wt% of phosphoric acid as a stationary solid in 2 mm i.d. × 2 m glass column. A flowrate of approx. 60 ml min −1 of carrier steam and a column temperature of 150–180°C were considered to be the optimum conditions for analysing water samples containing several groups of aliphatic compounds. The relationship between the retention time and the boiling point was obtained for two groups of soluble and slightly soluble compounds. The retention time of an aliphatic compound can, therefore, be predicted from its boiling point and solubility, and conversely, the compounds in an unknown sample can be characterized for identification from their retention times. The relative peak area increased proportionally with increase of the effective number of carbon atoms in the compound. By SCGC, various aliphatic compounds present in water at concentrations higher than approx. 40 μg 1 −1 can be analysed directly including some polar compounds which are difficult to analyze by conventional gas chromatography without complicated pre-treatment.
Published Version
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