Table 2. ANOVA Statistics of CCD for SF/BCB^a.

source	sum of squares	df	mean square	F value	p-value
Model	7001.94/6571.44	9/9	777.99/730.16	322.93/266.81	<0.0001*/<0.0001*
concentration of SF/BCB (mg L–1, A)	3887.79/653.49	1/1	3887.79/653.49	1613.75/238.79	<0.0001*/<0.0001*
temperature (°C, B)	509.73/4.78	1/1	509.73/4.78	211.58/1.75	<0.0001*/0.2157
pHi (−, C)	3.24/29.54	1/1	3.24/29.54	1.35/10.79	0.2728/0.0082*
AB	7.26/13.06	1/1	7.26/13.06	3.01/4.77	0.1133/0.0539
AC	59.84/101.39	1/1	59.84/101.39	24.84/37.05	0.0006*/0.0001*
BC	14.31/67.86	1/1	14.31/67.87	5.94/24.80	0.0350*/0.0006*
A2	1206.73/4199.16	1/1	1206.73/4199.15	500.89/1534.41	<0.0001*/<0.0001*
B2	154.09/1237.94	1/1	154.09/1237.94	63.96/452.35	<0.0001*/<0.0001*
C2	1561.81/1273.64	1/1	1561.81/1273.64	648.28/465.40	<0.0001*/<0.0001*
Residual	24.09/27.37	10/10	2.41/2.74
lack of fit	24.09/27.37	5/5	4.82/5.47
pure error	0.00/0.00	5/5	0.00/0.00
cor. Total	7026.03/6598.81	19/19
std. dev.	1.55/1.65			R2	0.9965/0.9958
Mean	40.38/33.63			adj. R2	0.9935/0.9921
C.V. %	3.84/4.92			pred. R2	0.9736/0.9679
PRESS	185.51/211.52			adeq. precision	49.7296/48.3519

^adf degrees of freedom and * significant.