An alternative method for the analysis of phenol and o-, m-, and p-cresol by capillary GC/FID

An alternative method for the sampling and simultaneous analysis of phenol, o-, m-, and p-cresol, employing XAD-7 as a sorbent for the collection of each analyte, is described. Desorption was achieved with methanol followed by analysis of all samples using gas chromatography with flame ionization detection. The separation of all analytes was achieved on a Stabilwax-DA capillary column. Sample collection and preparation was improved over current methods used at the National Institute for Occupational Safety and Health. The results obtained when a Stabilwax-DA capillary column was used in the analysis, as compared to those obtained using a Stabilwax capillary column, indicated achievement of baseline separation of the analytes. Peak resolution and overall peak shape were enhanced by the use of the Stabilwax-DA column. Lower limits of detection were achieved for each analyte. Desorption efficiency and storage stability results (30 days) were acceptable. Sample stability in solution and on solid sorbent tubes was examined. The relative standard deviation of the analytical portion of the method was found to be 0.045. This method provides a simplified, concise, simultaneous analysis of phenol, o-, m-, and p-cresol.