Abstract
Abstract : During the preparative gas chromatography of some organophosphorus esters using a silicone gum rubber column, a copious white deposit was formed on the collector electrode of the flame ionization detector over a period of 2 weeks. Although the deposits from both detector and injection port appeared similar to the naked eye, analysis by the Debye-Scherrer X-ray diffraction method and by optical emission spectroscopic techniques showed that the detector deposits were mainly silicon phosphate (2SiO2.P2O5), and the injection port samples were alpha cristobalite (SiO2).
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