Chemosphere, 33(3):393-404, 1996. Paper Website abstract bibtex
The analytical chemistry of long chain alkyl nitrates with carbon\nnumbers up to 26 is reported for the first time. The thermolabile\nlong chain alkyl nitrates can be analysed by capillary gas chromatography\non short columns (5-10 m) with thin films (0,1-0,25pm). The short\ncolumn technique combined with on-column injection and the use of\nhydrogen at high flow rates prevents the thermal degradation of the\nthermolabile semivolatile organonitrates during the GC separation.\nHRGC/ECD, and HRGC/MSD using 46 amu as the signal reveal a standard\npattern of isomeric organonitrates surprizingly up to only C17 in\nsemirural air. The concentrations decrease continously from 7,3 ng\nNm-3 corresponding to 1,11 pptv for the hexyl nitrates to 1,7 ng\nNM-3 corresponding to 0,15 pptv for the tetradecyl nitrates. No semivolatile\nalkyl nitrates could be detected in particulates (>=2 micron) collected\nby a glass fibre filter. Alkyl nitrates are known as reservoir species\nof NO/NO2 in air. Their biological potential is also well established.\nLong chain alkyl nitrates form lipophilic carriers for NOx and therefore\nnitric acid and nitrate ions.