Abstract:

The whole procedure of GC determination of ethyl acetate in distilled spirit was traced to systematically analyze the source of determination uncertainty and subsequently assess and synthesize each component of uncertainty. Results show that the 1 mL outflow graduated pipette was a major source of determination uncertainty. When the content of ethyl acetate was determined to be 1.556 g/L, the uncertainty was consequently extended to 0.032 g/L. An expression of uncertainty was proposed as C = (1.556 ± 0.032) g/L, k = 2, P = 95%.

Key words: ethyl acetate, uncertainty, gas chromatography, distilled spirit