Uncertainty Evaluation of Toluene Determination in Room Air by Thermal Desorption-Gas Chromatography

The method of uncertainty evaluation of determination of toluene in room air has been established. Gas chromatography with thermal desorption was used for determining of toluene. The main factors which can affect on the analytical results were identified. The measurement repeatability, standard solution preparation process, calibration curve fitting, sampling process and the instrument are the main sources of toluene uncertainty. The Uncertainty of calibration curve fitting has been identified as the greatest effect on the analytical results.