Orthogonal Design Study on Factors Affecting the Determination of Common Odors in Water Samples by Headspace Solid-Phase Microextraction Coupled to GC/MS

Table 5

The analysis of the variance of the main factors on the respective peak area of headspace volatile odors in simulated water samples.

Source^a	2-MIB					GSM
	df^b	SUM^c	MS^d	F-value	Significant	df	SUM	MS	F-value	Significant
A	3	7.90979	2.63659	100.8	**	3	194.85201	64.95067	56.1	**
B	3	6.59627	2.19875	84.1	**	3	108.42397	36.14132	31.2	**
C	3	0.77847	0.25949	9.9	*	3	11.25019	3.75006	3.2
D	3	0.27097	0.09032	3.45		3	1.40387	0.46795	0.4
E	3	1.22373	0.40791	15.6	**	3	5.32751	1.77583	1.5
F	3	0.19630	0.06543	2.50		3	7.39079	2.46359	2.1
G	3	0.06370	0.02123	0.81		3	0.69210	0.23070	0.2
Error	10	0.26148	0.02614			10	11.56231	1.15623

* and **: significant at 𝑃≤0.01 and 𝑃≤0.001, respectively. ^aSource A: extraction temperature (°C); Source B: extraction time (min); Source C: rotate-speed (rpm); Source D: ionic strength (w/v, %); Source E: desorption time (min); Source F: desorption temperature (°C); and Source G: solution pH. ^bDegree of freedom; ^csum of square; and ^dmean of square.