DESIGN AND OPTIMIZATION FOR HAZARDOUS JAROSITE WASTE RECYCLING IN ENVIRONMENTALLY SUITABLE COMPOSITE PRODUCTS USING RESPONSE SURFACE METHODOLOGY - Management of Hazardous Residues Containing Cd - page 79

Table 30. ANOVA for mixture special cubic
model for response cadmium leaching

Source Sum of

Square s

DF Mean Squ

are

F Value Prob > F

Model 0.45 6 0.075 15.08 0.0011 significant

Linear
Mixture

0.41 2 0.21 41.68 0.0001

AB 8.057E-003 1 8.057E-003 1.62 0.2438

AC 5.474E-005 1 5.474E-005 0.011 0.9194

BC 4.516E-003 1 4.516E-003 0.91 0.3725

ABC 7.145E-005 1 7.145E-005 0.014 0.9080

Residual 0.035 7 4.975E-003

Lack of Fit 0.035 3 0.012 376.19 < 0.0001 significant

Pure Error 1.230E-004 4 3.075E-005

Cor Total 0.49 13

Table 31. ANOVA for mixture reduced
cubic model for response lead leaching

Source

Sum of
Squares

Mean
Square

F Value DF Prob >

F

Model 367.22 8 45.90 236.74 <

0.0001

significant

Linear
Mixture

248.60 2 124.30 641.06 <

0.0001

AB 0.14 1 0.14 0.70 0.4395

AC 8.50 1 8.50 43.81 0.0012

BC 2.00 1 2.00 10.32 0.0237

ABC 2.33 1 2.33 12.03 0.0179

AB(A-B) 20.04 1 20.04 103.34 0.0002

AC(A-C) 13.61 1 13.61 70.18 0.0004

Residual 0.97 5 0.19

Lack of
Fit

0.95 1 0.95 201.05 0.0001 significant

Pure Error 0.019 4 4.728E-

003

Cor Total 368.19 13