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

Table 3

Chromatographic system data: retention times, selectivity factor, peak area, resolution, symmetry, and theoretical plates at several heating rates.

Compounds	Heating rate (°C/min)	Retention time tR (min)	Peak area	Symmetry	Theoretical plates (N)	Selectivity factor (α)	Resolution (Rs)
Acetaldehyde	3	1.81	132912975	1.08	14560	4.14	26.67
	5	1.81	141684515	1.00	20967	3.90	26.91
	10	1.79	131957565	1.17	14240	3.78	19.43
	15	1.78	148895708	1.08	10346	3.21	17.07
	20	1.78	143766294	1.00	14082	2.81	17.57
	25	1.76	150403601	1.17	10115	2.34	12.67
Ethyl acetate	3	3.41	401766478	1.00	51680	1.07	2.55
	5	3.29	401137946	1.17	48107	1.36	12.00
	10	3.15	364177594	0.92	24806	1.30	7.86
	15	3.06	412759798	1.22	23409	1.25	6.71
	20	3.01	383032531	0.96	22650	1.22	6.00
	25	2.71	426593713	1.22	18360	1.18	4.29
Methanol	3	3.55	290731692	1.13	80656	1.29	11.00
Ethanol	3	4.21	290731692	0.96	57875	2.31	54.29
	5	4.01	210622985	0.85	71467	1.96	43.33
	10	3.70	169468067	1.08	60844	1.78	33.82
	15	3.53	187747057	0.92	55382	1.72	30.36
	20	3.43	142977205	0.92	52288	1.69	29.09
	25	3.01	135532318	0.92	40267	1.74	26.36
Butanol	3	8.01	89132249	0.92	209502	—	—
	5	6.61	87923903	0.82	194187	—	—
	10	5.56	20142136	0.82	197847	—	—
	15	5.20	22625365	1.00	173059	—	—
	20	5.03	22851934	0.82	161926	—	—
	25	4.46	22713765	1.22	127306	—	—