Gas chromatographic determination of 1,4-dioxane at low parts-per-million levels in glycols.
1,4-Dioxane is a flammable liquid and tends to form explosive peroxides. Its formation in glycols (low parts-per-million levels), which are used as dehumidifying agents in refineries, may take place by condensation. 1,4-Dioxane thus formed gets distilled over with benzene in the refinery process. Therefore, it is necessary to identify and determine the levels of 1,4-dioxane in glycols as well as benzene. Gas chromatography (GC) is probably the best technique for this purpose. GC analysis may be carried out using a flame ionization detector. Results show that 1,4-dioxane can be comfortably determined down to 2 ppm in glycols and benzene.
Toshniwal Instruments Limited, MIDC, Nasik, India. mdp@nsk.toshniwal.com
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Pundlik
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Sitharaman
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Kaur