Table 5

Solution analyses for strontium sorption to goethite in air, I = 0.1 M NaCl and T = 25°C.
Final pH
 Surface Area m2 L-1
 Initial [Sr] M
 Final [Sr] M
 %Sr sorbed
 Γ Sr sorbed Mol m-2
 Total Dissolved Carbonate M
Total Sr = 10-4 M aged for 2 days
 ± 5%

6.43
 1299
 1.10 × 10-4
 1.06 × 10-4
 3.9
 3.34 × 10-9
 not measured
6.85
 1304
 1.10 × 10-4
 1.07 × 10-4
 2.5
 2.13 × 10-9
 not measured
7.23
 1307
 1.10 × 10-4
 1.08 × 10-4
 1.8
 1.49 × 10-9
 not measured
7.62
 1311
 1.11 × 10-4
 1.02 × 10-4
 8.4
 7.13 × 10-9
 not measured
7.97
 1309
 1.11 × 10-4
 1.03 × 10-4
 6.8
 5.71 × 10-9
 not measured
8.29
 1305
 1.1 × 10-4
 1.17 × 10-4
 -5.8
 -4.92 × 10-9
 not measured
8.96
 1304
 1.10 × 10-4
 6.18 × 10-4
 43.7
 3.68 × 10-8
 not measured
9.28
 1297
 1.09 × 10-4
 4.11 × 10-4
 62.4
 5.26 × 10-8
 not measured
9.97
 1278
 1.08 × 10-4
 2.30 × 10-5
 78.8
 6.68 × 10-8
 not measured
Total Sr = 10-4 M aged for 14 days
 ± 5%

6.52
 1478
 1.11 × 10-4
 1.09 × 10-4
 1.9
 1.43 × 10-9
 1.47 × 10-4
7.03
 1513
 1.11 × 10-4
 1.06 × 10-4
 5.0
 3.69 × 10-9
 2.10 × 10-4
7.50
 1523
 1.12 × 10-4
 1.01 × 10-4
 9.5
 6.97 × 10-9
 3.76 × 10-4
8.12
 1491
 1.11 × 10-4
 8.20 × 10-5
 26.4
 1.97 × 10-8
 5.29 × 10-4
8.18
 1507
 1.11 × 10-4
 6.84 × 10-5
 38.4
 2.83 × 10-8
 6.38 × 10-4
9.19
 1478
 1.11 × 10-4
 4.20 × 10-5
 62.0
 4.64 × 10-8
 7.22 × 10-4
9.84
 1484
 1.10 × 10-4
 2.17 × 10-5
 80.2
 5.93 × 10-8
 8.93 × 10-4
10.59
 1453
 1.09 × 10-4
 7.54 × 10-6
 93.1
 6.96 × 10-8
 9.97 × 10-4
11.32
 1416
 1.06 × 10-4
 2.15 × 10-6
 98.0
 7.34 × 10-8
 1.07 × 10-3
Total Sr = 10-5 M aged for 2 days
 ± 5%

6.89
 1301
 1.17 × 10-5
 9.81 × 10-6
 16.4
 1.48 × 10-9
 not measured
7.18
 1310
 1.18 × 10-5
 1.00 × 10-5
 15.0
 1.35 × 10-9
 not measured
7.51
 1309
 1.18 × 10-5
 9.49 × 10-6
 19.6
 1.77 × 10-9
 not measured
7.86
 1308
 1.18 × 10-5
 8.64 × 10-6
 26.7
 2.41 × 10-9
 not measured
8.18
 1304
 1.18 × 10-5
 7.36 × 10-6
 37.4
 3.37 × 10-9
 not measured
8.76
 1300
 1.17 × 10-5
 4.51 × 10-6
 61.4
 5.52 × 10-9
 not measured
9.44
 1293
 1.16 × 10-5
 3.45 × 10-6
 70.4
 6.34 × 10-9
 not measured
10.05
 1285
 1.15 × 10-5
 7.57 × 10-7
 93.4
 8.40 × 10-9
 not measured
Total Sr = 10-5 M aged for 14 days
 ± 5%

6.60
 1484
 1.30 × 10-5
 1.25 × 10-5
 3.1
 2.74 × 10-10
 1.04 × 10-4
7.17
 1482
 1.30 × 10-5
 1.27 × 10-5
 2.4
 2.09 × 10-10
 2.08 × 10-4
8.36
 1441
 1.30 × 10-5
 7.73 × 10-6
 40.6
 3.66 × 10-9
 5.83 × 10-4
9.36
 1488
 1.29 × 10-5
 2.06 × 10-6
 84.1
 7.30 × 10-9
 8.14 × 10-4
9.92
 1491
 1.28 × 10-5
 6.79 × 10-7
 94.7
 8.15 × 10-9
 9.33 × 10-4
10.55
 1485
 1.27 × 10-5
 1.33 × 10-7
 99.0
 8.46 × 10-9
 1.08 × 10-3
Total Sr = 1.3 × 10-6 M aged for 2 days
 (± 12%)

6.28
 1296
 1.28 × 10-6
 1.19 × 10-6
 7.1
 7.03E × 10-11
 not measured
6.58
 1302
 1.29 × 10-6
 1.31 × 10-6
 -1.5
 -1.50 × 10-11
 not measured
7.08
 1306
 1.29 × 10-6
 1.11 × 10-6
 14.1
 1.39 × 10-10
 not measured
7.38
 1131
 1.27 × 10-6
 1.11 × 10-6
 12.6
 1.41 × 10-10
 not measured
7.65
 1090
 1.26 × 10-6
 9.95 × 10-7
 21.1
 2.43 × 10-10
 not measured
8.09
 1057
 1.25 × 10-6
 7.21 × 10-7
 42.4
 5.02 × 10-10
 not measured
8.78
 1055
 1.25 × 10-6
 3.55 × 10-7
 71.5
 8.45 × 10-10
 not measured
9.49
 970
 1.23 × 10-6
 1.26 × 10-7
 89.8
 1.14 × 10-9
 not measured
10.05
 884
 1.21 × 10-6
 3.44 × 10-8
 97.2
 1.33 × 10-9
 not measured

Carroll et al. Geochemical Transactions 2008 9:2   doi:10.1186/1467-4866-9-2