Abstract
In an attempt to improve the analysis of methanolic extracts of atmospheric samples containing highly polar, water-soluble organic compounds using capillary gas chromatography, the hot on-column injection technique was chosen. Since the on-column injector used was not designed to be heated, the point of injection was inside the heated gas chromatograph oven. Preliminary analyses indicated solute peak splitting and distortion occurred when 0.4 ..mu..L was injected, severely limiting overall sensitivity. To overcome this limitation, the on-column injector was used together with a separately heated metal sheath that surrounded the first 7 cm of the capillary column. This modification allowed the injection of 4 ..mu..L of methanol, containing highly polar, water-soluble solutes, into the chromatographic system with no evidence of solute peak splitting or distortion. 15 references, 2 figures, 1 table.
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