Table 1

Solution analyses for strontium sorption to amorphous silica in nitrogen atmosphere, I = 0.1 M NaCl and T = 25°C.
Final pH
 Surface Area m2 L-1
 Initial [Sr] M
 Final [Sr] M
 %Sr orbed
 Γ Sr sorbed Mol m-2
Total Sr = 10-3 M aged for 2 days
± 5%
3.14
 10934
 9.99 × 10-4
 9.71 × 10-4
 2.8
 2.57 × 10-9
3.89
 10983
 1.00 × 10-3
 9.90 × 10-4
 1.3
 1.17 × 10-9
3.89
 10983
 1.00 × 10-3
 9.88 × 10-4
 1.5
 1.38 × 10-9
5.42
 11037
 1.01 × 10-3
 9.86 × 10-4
 2.0
 1.86 × 10-9
6.02
 11075
 1.01 × 10-3
 9.83 × 10-4
 2.5
 2.32 × 10-9
6.33
 11115
 1.01 × 10-3
 9.78 × 10-4
 3.4
 3.06 × 10-9
6.55
 11095
 1.01 × 10-3
 9.97 × 10-4
 1.5
 1.40 × 10-9
7.12
 11101
 1.01 × 10-3
 9.80 × 10-4
 3.2
 2.92 × 10-9
7.04
 11035
 1.01 × 10-3
 9.74 × 10-4
 3.4
 3.15 × 10-9
7.42
 10855
 9.95 × 10-4
 9.33 × 10-4
 6.3
 5.74 × 10-9
7.95
 10705
 9.80 × 10-4
 8.40 × 10-4
 14.2
 1.30 × 10-8
8.62
 10415
 9.54 × 10-4
 6.23 × 10-4
 34.7
 3.18 × 10-8
9.12
 10088
 9.21 × 10-4
 4.16 × 10-4
 54.8
 5.00 × 10-8
9.52
 9720
 8.88 × 10-4
 2.64 × 10-4
 70.3
 6.43 × 10-8
Total Sr = 10-4 M aged for 2 days
± 5%
4.20
 11019
 1.00 × 10-4
 9.85 × 10-5
 2.0
 1.80 × 10-10
4.89
 11005
 1.01 × 10-4
 9.88 × 10-5
 1.7
 1.60 × 10-10
5.50
 11034
 1.01 × 10-4
 9.92 × 10-5
 1.6
 1.42 × 10-10
6.22
 11013
 1.01 × 10-4
 1.01 × 10-4
 0.4
 3.93 × 10-11
6.33
 11057
 1.01 × 10-4
 1.01 × 10-4
 0.5
 4.92 × 10-11
6.71
 11110
 1.01 × 10-4
 9.97 × 10-5
 1.7
 1.56 × 10-10
6.62
 11087
 1.01 × 10-4
 1.01 × 10-4
 0.7
 6.64 × 10-11
7.01
 11086
 1.01 × 10-4
 9.84 × 10-5
 2.5
 2.30 × 10-10
7.46
 10912
 9.96 × 10-5
 9.38 × 10-5
 5.8
 5.31 × 10-10
7.82
 10809
 9.86 × 10-5
 8.75 × 10-5
 11.3
 1.03 × 10-9
8.54
 10475
 9.56 × 10-5
 6.42 × 10-5
 32.8
 2.99 × 10-9
8.95
 10257
 9.39 × 10-5
 4.89 × 10-5
 47.9
 4.38 × 10-9
9.43
 9888
 9.05 × 10-5
 2.84 × 10-5
 68.7
 6.29 × 10-9
Total Sr = 10-5 M aged for 2 days
± 5%
6.82
 11081
 1.06 × 10-5
 1.06 × 10-5
 -0.5
 -4.60 × 10-12
6.57
 11086
 1.06 × 10-5
 1.04 × 10-5
 1.5
 1.41 × 10-11
6.57
 11044
 1.06 × 10-5
 9.30 × 10-6
 12.1
 1.15 × 10-10
6.84
 10939
 1.05 × 10-5
 1.03 × 10-5
 1.5
 1.42 × 10-11
7.22
 10842
 1.04 × 10-5
 9.47 × 10-6
 8.6
 8.19 × 10-11
7.88
 10672
 1.02 × 10-5
 8.33 × 10-6
 18.3
 1.74 × 10-10
7.91
 10481
 1.00 × 10-5
 7.53 × 10-6
 24.7
 2.35 × 10-10
9.16
 9584
 9.14 × 10-6
 2.40 × 10-6
 73.8
 7.03 × 10-10
9.74
 8484
 8.13 × 10-6
 8.33 × 10-7
 89.8
 8.60 × 10-10
Total Sr = 1.5 10-6 M aged for 2 days
± 10%
6.32
 11056
 1.51 × 10-6
 1.60 × 10-6
 -5.5
 -7.55 × 10-12
6.53
 11013
 1.51 × 10-6
 1.56 × 10-6
 -3.4
 -4.65 × 10-12
6.82
 11000
 1.51 × 10-6
 1.59 × 10-6
 -5.0
 -6.85 × 10-12
6.83
 11032
 1.51 × 10-6
 1.55 × 10-6
 -2.8
 -3.86 × 10-12
7.06
 10988
 1.50 × 10-6
 1.39 × 10-6
 7.3
 9.99 × 10-12
7.29
 10900
 1.49 × 10-6
 1.45 × 10-6
 2.7
 3.74 × 10-12
8.65
 9964
 1.37 × 10-6
 6.96 × 10-7
 49.1
 6.74 × 10-11
9.10
 9534
 1.31 × 10-6
 3.77 × 10-7
 71.2
 9.76 × 10-11
9.16
 9562
 1.31 × 10-6
 3.65 × 10-7
 72.1
 9.87 × 10-11
6.62
 11041
 1.52 × 10-6
 1.51 × 10-6
 0.6
 7.93 × 10-13
6.59
 11092
 1.52 × 10-6
 1.51 × 10-6
 0.6
 7.89 × 10-13
6.52
 11036
 1.52 × 10-6
 1.48 × 10-6
 2.7
 3.71 × 10-12
6.77
 10957
 1.51 × 10-6
 1.59 × 10-6
 -5.6
 -7.65 × 10-12
7.30
 10831
 1.48 × 10-6
 1.37 × 10-6
 7.4
 1.01 × 10-11
9.62
 9014
 1.24 × 10-6
 1.26 × 10-7
 89.8
 1.23 × 10-10
Total Sr = 6 × 10 -7 M aged for 2 days
± 20%
6.34
 11073
 6.10 × 10-7
 6.91 × 10-7
 -13.3
 -7.33 × 10-12
6.65
 11058
 6.09 × 10-7
 6.70 × 10-7
 -10.0
 -5.53 × 10-12
6.78
 11046
 6.08 × 10-7
 6.41 × 10-7
 -5.4
 -2.99 × 10-12
6.83
 11028
 6.07 × 10-7
 6.20 × 10-7
 -2.1
 -1.13 × 10-12
7.29
 10862
 5.98 × 10-7
 6.01 × 10-7
 -0.6
 -3.08 × 10-13
7.2
 10841
 5.97 × 10-7
 6.20 × 10-7
 -3.8
 -2.07 × 10-12
8.66
 9955
 5.48 × 10-7
 2.50 × 10-7
 54.4
 3.00 × 10-11
9.06
 9417
 5.19 × 10-7
 1.21 × 10-7
 76.7
 4.22 × 10-11
9.62
 8977
 4.94 × 10-7
 4.34 × 10-8
 91.2
 5.02 × 10-11

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