Statistical Optimization of Bioleaching for Simultaneous Recovery of Cu, Sn, Pb, and Zn from Computer-Printed Circuit Boards

Table 5

The ANOVA table for the model to predict percent of leaching of copper and tin.

Source	Model to predict percent of leaching of copper					Model to predict percent of leaching of tin
	Sum of squares	df	Mean square	F value	value Prob > F	Sum of squares	df	Mean square	F value	value Prob > F
Model	118.14	9	13.13	93.35	<0.0001	82.01	6	13.67	22.81	<0.0001
A-time	4.96	1	4.96	35.28	0.0006	16.91	1	16.91	28.21	0.0003
B-temp	4.37	1	4.37	31.05	0.0008	0.9045	1	0.9045	1.51	0.2474
C-pulp den	10.06	1	10.06	71.53	<0.0001	4.29	1	4.29	7.16	0.0232
AB	0.9025	1	0.9025	6.42	0.0390	0.9900	1	0.9900	1.65	0.2277
AC	2.02	1	2.02	14.34	0.0068	24.11	1	24.11	40.23	<0.0001
BC	0.3306	1	0.3306	2.35	0.1690	34.81	1	34.81	58.09	<0.0001
A^2	12.16	1	12.16	86.46	<0.0001
B^2	38.61	1	38.61	274.59	<0.0001
C^2	44.56	1	44.56	316.92	<0.0001
Residual	0.9843	7	0.1406			5.99	10	0.5993
Lack of fit	0.2656	3	0.0885	0.4927	0.7063	5.17	6	0.8618	4.19	0.0933
Pure error	0.7187	4	0.1797			0.8219	4	0.2055
Cor total	119.12	16				88.00	16