The purpose of this study is the analysis of various samples containing ethanol and/or methanol in aqueous solutions presents in bottles provided by National Metrology Institute of South Africa (NMISA) in proficiency testing studies organized by the Intra-African System of Metrology (AFRIMETS). We received two samples, for each one 3 flasks of 25 mL. The flasks were kept, directly after reception and before analysis at 4 ± 1°C. The analysis was performed by GC-FID coupled to a headspace (HS) autosampler with internal standard calibration. The method validation was performed by evaluating the selectivity, linearity, repeatability, accuracy, limits of detection and quantification and specificity, according to the XPT-90-210 standard. The estimation of the measurements uncertainties was successfully realized according to the Guide to the Expression of Uncertainty in Measurement (GUM).
I. Limam, M. Mezni, R. Khrouf, W. Belazrag, M. Ben Achour
Ethanol, HS-GC-FID, Proficiency testing, measurements uncertainties, internal standard