Heavy metal adsorption on iron oxide and iron oxide-coated silica ...

166Table B.2 Potentiometric Titration of 1 g U ' Goethite Precipitation Coated-SilicapH a (IS 10-3) pH a (IS 10-2) pH a (IS 10-1)1.68 2.518 1.65 1.784 2.00 3.0021.71 2.213 1.68 1.527 2.05 2.5371.83 1.561 1.76 1.280 2.12 2.1942.00 0.952 1.86 1.063 2.29 1.4082.17 0.569 1.98 0.723 2.42 1.0652.48 0.292 2.18 0.654 2.60 0.7032.78 0.116 2.50 0.371 2.90 0.3222.83 0.106 2.83 0.210 2.95 0.2902.89 0.102 2.94 0.175 3.00 0.2502.95 0.085 3.08 0.132 3.07 0.2243.03 0.079 3.17 0.110 3.14 0.1873.11 0.057 3.29 0.091 3.22 0.1473.22 0.044 3.44 0.065 3.33 0.1143.37 0.032 3.68 0.042 3.48 0.0823.43 0.030 3.74 0.035 3.69 0.0443.49 0.024 3.82 0.031 3.75 0.0383.56 0.018 3.91 0.025 3.82 0.0313.62 0.015 4.01 0.017 3.91 0.0253.69 0.013 4.15 0.010 4.01 0.0173.73 0.012 4.23 0.006 4.14 0.0103.77 0.010 4.34 0.003 4.23 0.0063.82 0.010 4.48 -0.001 4.33 0.0023.87 0.008 4.66 -0.005 4.47 -0.0014.00 0.005 4.94 -0.010 4.68 -0.0054.08 0.004 5.21 -0.018 5.05 -0.0094.19 0.003 5.95 -0.025 8.15 -0.0144.32 0.001 9.18 -0.027 9.23 -0.0164.50 -0.001 9.56 -0.027 9.55 -0.0174.83 -0.002 9.77 -0.025 9.74 -0.0175.42 -0.007 9.91 -0.024 9.87 -0.0188.31 -0.014 10.02 -0.022 9.97 -0.0189.25 -0.016 10.06 -0.0179.55 -0.0179.71 -0.0199.85 -0.0209.96 -0.01910.05 -0.01910.13 -0.018