Table 2 The significance probability (p - value; F- ratio), lack of fit and coefficients of determination of second order polynomial models that demonstrated the relationship between the experimental and response factors as refined by the BBD.

From: Multivariate Optimization of Tenax TA-Thermal Extraction for Determining Gaseous Phase Organophosphate Esters in Air Samples

OPE		Linear effects			Linear interactions			Quadratic interactions			Model	LOF	r ²	\({r}_{adj}^{2}\)
OPE		A	B	C	AB	AC	BC	AA	BB	CC	Model	LOF	r ²	\({r}_{adj}^{2}\)
TEP	RC	−6578.31	−5362.24	68725.90	−41.71	67.82	−1.24	−86.11	−128.51	−123.33	−8.54E6		0.9090	0.7453
	F-ratio	2.51	7.41	0.18	1.08	0.40	0.00	1.07	37.96	0.69		5.69
	p-value	0.1741	0.0417	0.6885	0.3457	0.5536	0.9823	0.3493	0.0016	0.4435	0.0368	0.1570
TPP	RC	−20214.10	21629.90	192765.00	3.94	224.25	−71.02	−266.10	−127.83	−355.49	−2.32E7		0.7661	0.3450
	F-ratio	4.43	4.40	0.03	0.00	0.61	0.25	1.41	5.21	0.80		1.36
	p-value	0.0893	0.0901	0.8646	0.9722	0.4699	0.6416	0.2882	0.0713	0.4129	0.2641	0.4840
TNBP	RC	−7979.85	21520.60	131141.00	41.30	139.35	−70.44	−189.86	−54.09	−241.67	−1.59E7		0.7720	0.3615
	F-ratio	4.42	7.47	0.02	0.31	0.50	0.51	1.51	1.96	0.77		0.91
	p-value	0.0895	0.0412	0.9000	0.6018	0.5127	0.5083	0.2737	0.2202	0.4191	0.2520	0.6070
TCEP	RC	7444.20	4191.35	11763.40	30.20	1.54	−13.45	−40.86	−6.84	−20.55	−1.42E6		0.9404	0.8332
	F-ratio	13.48	53.65	0.06	6.93	0.00	0.77	2.93	1.31	0.23		2.00
	p-value	0.0144	0.0007	0.8197	0.0463	0.9619	0.4194	0.1477	0.3037	0.6488	0.0139	0.3710
TCIPP	RC	−23.90	3572.82	12392.20	7.90	13.15	−12.09	−21.58	−3.74	−23.40	−1.45E6		0.7846	0.3969
	F-ratio	4.83	8.45	0.06	0.89	0.35	1.17	1.53	0.73	0.57		0.74
	p-value	0.0794	0.0335	0.8237	0.3896	0.5822	0.3291	0.2716	0.4310	0.4850	0.2264	0.6720
TDCIPP	RC	2997.13	2853.14	12686.90	11.21	2.32	−8.71	−19.84	−4.52	−21.63	−1.77E6		0.9553	0.8747
	F-ratio	15.32	75.02	1.58	5.42	0.03	1.84	3.92	3.25	1.47		1.77
	p-value	0.0113	0.0003	0.2645	0.0673	0.8636	0.2326	0.1046	0.1313	0.2789	0.0070	0.4040
TBOEP	RC	5088.09	1724.69	8810.79	17.75	−4.76	−5.82	−17.27	−3.39	−13.68	−1.37E6		0.9724	0.9228
	F-ratio	30.49	114.02	5.20	18.73	0.19	1.13	4.10	2.52	0.81		3.46
	p-value	0.0027	0.0001	0.0715	0.0075	0.6816	0.3360	0.0989	0.1730	0.4085	0.0022	0.2410
TPHP	RC	11657.50	14648.60	71805.70	50.75	12.85	−47.80	−79.65	−16.74	−121.79	−1.02E7		0.9334	0.8134
	F-ratio	12.35	43.24	2.51	4.39	0.04	2.19	2.50	1.77	1.85		1.09
	p-value	0.0170	0.0012	0.1740	0.0902	0.8500	0.1987	0.1748	0.2414	0.2321	0.0180	0.5520
EHDPP	RC	45358.80	21252.60	135283.00	155.24	−12.61	−71.20	−224.65	−39.05	−229.32	−1.93E7		0.9714	0.9200
	F-ratio	28.33	110.25	1.02	16.13	0.01	1.91	7.79	3.77	2.57		1.87
	p-value	0.0031	0.0001	0.3584	0.0102	0.9074	0.2256	0.0384	0.1099	0.1698	0.0024	0.3890
TEHP	RC	12887.70	77284.80	417801.00	306.78	343.72	−261.83	−670.97	−113.61	−752.44	−5.49E7		0.9354	0.8193
	F-ratio	11.92	41.94	0.52	5.34	0.94	2.19	5.90	2.71	2.35		1.64
	p-value	0.0182	0.0013	0.5017	0.0687	0.3760	0.1990	0.0595	0.1609	0.1860	0.0167	0.4260

RC: Regression coefficient, A, B and C are the experimental factors, desorption flow, cryofocusing temperature and cryodesorption temperature, respectively. LOF refers to Lack of fit.

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Table 2 The significance probability (p - value; F- ratio), lack of fit and coefficients of determination of second order polynomial models that demonstrated the relationship between the experimental and response factors as refined by the BBD.

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