Optimization Studies on Recovery of Metals from Printed Circuit Board Waste

Table 3

ANOVA quadratic model for lead.

Source	Sum of squares	DOF	Mean square	value	value
Model	3152.45	9	350.27	4.43	0.0312	Significant
A-CD	650.52	1	650.52	8.23	0.0240
B-solvent	434.98	1	434.98	5.51	0.0514
C-time	330.12	1	330.12	4.18	0.0802
AB	6.10	1	6.10	0.0772	0.7891
AC	0.1156	1	0.1156	0.0015	0.9706
BC	204.63	1	204.63	2.59	0.1516
A^2	1459.61	1	1459.61	18.47	0.0036
B^2	11.76	1	11.76	0.1489	0.7111
C^2	13.89	1	13.89	0.1758	0.6876
Residual	553.05	7	79.01
Lack of fit	541.64	3	180.55	63.27	0.0008	Significant
Pure error	11.41	4	2.85
Total	3705.50	16