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

Table 7

Quality of the quadratic model for the leaching of heavy metals.

Parameters	Cu	Sn	Zn	Pb
Standard deviation (SD)	0.375	0.7741	0.4826	0.5587
Mean	92.63	91.59	93.44	95.58
Coefficient of variation (CV %)	0.4048	0.8452	0.5165	0.5845
R-squared (R^2)	0.9917	0.9319	0.9713	0.9659
Adj R-squared (R^2)	0.9811	0.891	0.9344	0.9222
Pred R-squared (R^2)	0.9549	0.6989	0.7295	0.7405
Adequate precision (AP)	33.0102	16.0795	18.1342	16.643