Determination of Methanol, Acetaldehyde, and Ethyl Acetate in Thousand Folds of Ethanol Sample by Headspace Gas Chromatography with Mass Spectrometry

Table 8

The repeatability of the HS-GC-MS method.

Compound	Acetaldehyde			Ethyl acetate			Methanol			Ethanol
Concentration (mg/L)	5	80	240	5	80	240	5	80	240	50	800	2400
Intra-day precision of the method
RSD (%)	1.88	1.77	1.00	1.45	2.39	0.88	2.96	1.77	0.64	2.37	1.69	0.64
Inter-day precision of the method
RSD (%)	2.24	1.29	0.72	2.60	1.23	0.46	1.28	2.82	0.96	1.20	1.94	1.30