Table 4 Solution analyses for strontium sorption to goethite in nitrogen atmosphere, I = 0.1 M NaCl and T = 25°C.
From: Surface complexation model for strontium sorption to amorphous silica and goethite
Final pH | Surface Area m2L-1 | Initial [Sr] M | Final [Sr] M | %Sr sorbed | Γ Sr sorbed Mol m-2 |
|---|---|---|---|---|---|
Total Sr = 10-3 M, aged for 2 days |  | ± 5% |  | ||
6.53 | 1412 | 9.20 × 10-4 | 9.44 × 10-4 | -2.5 | -1.65 × 10-8 |
6.79 | 1435 | 9.25 × 10-4 | 9.26 × 10-4 | -0.2 | -1.01 × 10-9 |
6.96 | 1457 | 9.26 × 10-4 | 9.06 × 10-4 | 2.2 | 1.37 × 10-8 |
7.26 | 1565 | 9.30 × 10-4 | 8.47 × 10-4 | 8.9 | 5.30 × 10-8 |
7.40 | 1449 | 9.27 × 10-4 | 8.07 × 10-4 | 12.9 | 8.28 × 10-8 |
7.82 | 1433 | 9.23 × 10-4 | 6.85 × 10-4 | 25.8 | 1.66 × 10-7 |
8.30 | 1478 | 9.20 × 10-4 | 6.23 × 10-4 | 32.3 | 2.01 × 10-7 |
8.91 | 1479 | 9.16 × 10-4 | 5.27 × 10-4 | 42.5 | 2.63 × 10-7 |
9.49 | 1445 | 9.12 × 10-4 | 3.28 × 10-4 | 64.0 | 4.04 × 10-7 |
6.23 | 1431 | 9.61 × 10-4 | 9.45 × 10-4 | 1.6 | 1.08 × 10-8 |
6.74 | 1494 | 9.66 × 10-4 | 8.98 × 10-4 | 7.0 | 4.56 × 10-8 |
7.16 | 1472 | 9.68 × 10-4 | 9.30 × 10-4 | 3.9 | 2.58 × 10-8 |
7.47 | 1472 | 9.71 × 10-4 | 7.87 × 10-4 | 19.0 | 1.25 × 10-7 |
8.19 | 1491 | 9.76 × 10-4 | 7.67 × 10-4 | 21.5 | 1.40 × 10-7 |
8.51 | 1482 | 9.73 × 10-4 | 7.71 × 10-4 | 20.8 | 1.37 × 10-7 |
8.88 | 1481 | 9.69 × 10-4 | 5.56 × 10-4 | 42.6 | 2.79 × 10-7 |
9.25 | 1462 | 9.63 × 10-4 | 3.29 × 10-4 | 65.8 | 4.34 × 10-7 |
10.02 | 1452 | 9.55 × 10-4 | 9.74 × 10-5 | 89.8 | 5.91 × 10-7 |
Total Sr = 10-4 M, aged for 2 days |  | ± 5% |  | ||
6.43 | 1570 | 1.09 × 10-4 | 1.16 × 10-4 | -5.5 | -3.85 × 10-9 |
6.78 | 1433 | 1.10 × 10-4 | 1.10 × 10-4 | -0.6 | -4.52 × 10-10 |
7.23 | 1431 | 1.10 × 10-4 | 1.13 × 10-4 | -2.7 | -2.09 × 10-9 |
7.49 | 1442 | 1.11 × 10-4 | 1.10 × 10-4 | 1.0 | 7.44 × 10-10 |
7.78 | 1602 | 1.11 × 10-4 | 1.00 × 10-4 | 9.6 | 6.63 × 10-9 |
8.19 | 1555 | 1.11 × 10-4 | 8.76 × 10-5 | 20.8 | 1.48 × 10-8 |
8.89 | 1511 | 1.10 × 10-4 | 4.53 × 10-5 | 58.7 | 4.26 × 10-8 |
9.38 | 1532 | 1.10 × 10-4 | 3.44 × 10-5 | 68.6 | 4.90 × 10-8 |
9.9 | 1540 | 1.09 × 10-4 | 1.88 × 10-5 | 82.7 | 5.85 × 10-8 |
Total Sr = 10-5 M, aged for 2 days |  | ± 5% |  | ||
6.43 | 1540 | 1.08 × 10-5 | 1.06 × 10-5 | 1.4 | 9.51 × 10-11 |
6.74 | 1534 | 1.08 × 10-5 | 1.05 × 10-5 | 3.1 | 2.19 × 10-10 |
7.30 | 1501 | 1.09 × 10-5 | 1.07 × 10-5 | 1.8 | 1.29 × 10-10 |
7.73 | 1423 | 1.09 × 10-5 | 9.67 × 10-6 | 11.2 | 8.54 × 10-10 |
8.05 | 1463 | 1.09 × 10-5 | 9.31 × 10-6 | 14.6 | 1.08 × 10-9 |
8.42 | 1503 | 1.09 × 10-5 | 7.79 × 10-6 | 28.4 | 2.05 × 10-9 |
9.22 | 1502 | 1.08 × 10-5 | 3.88 × 10-6 | 64.2 | 4.62 × 10-9 |
9.79 | 1481 | 1.08 × 10-5 | 1.61 × 10-6 | 85.0 | 6.19 × 10-9 |
10.21 | 1416 | 1.07 × 10-5 | 7.34 × 10-7 | 93.2 | 7.06 × 10-9 |