Table 2

Solution analyses for strontium sorption to amorphous silica 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 = 10-3 M aged for 2 days
± 5%

6.67
 11073
 9.98 × 10-4
 1.01 × 10-3
 -1.5
 -1.31 × 10-9
 not measured
6.72
 11098
 1.00 × 10-3
 1.02 × 10-3
 -1.6
 -1.43 × 10-9
 not measured
6.80
 11086
 9.98 × 10-4
 1.03 × 10-3
 -3.6
 -3.27 × 10-9
 not measured
6.90
 11060
 9.94 × 10-4
 1.02 × 10-3
 -2.5
 -2.21 × 10-9
 not measured
7.19
 11012
 9.91 × 10-4
 1.05 × 10-3
 -6.1
 -5.46 × 10-9
 not measured
7.89
 10724
 9.66 × 10-4
 9.35 × 10-4
 3.2
 2.89 × 10-9
 not measured
8.32
 10522
 9.45 × 10-4
 8.00 × 10-4
 15.4
 1.38 × 10-8
 not measured
8.65
 10237
 9.23 × 10-4
 5.28 × 10-4
 42.7
 3.85 × 10-8
 not measured
9.58
 9224
 8.33 × 10-4
 3.22 × 10-5
 96.1
 8.68 × 10-8
 not measured
6.54
 11016
 1.00 × 10-3
 1.02 × 10-3
 -1.5
 -1.36 × 10-9
 1.72 × 10-5
6.61
 11026
 1.00 × 10-3
 1.01 × 10-3
 -0.4
 -3.41 × 10-10
 3.61 × 10-5
6.70
 11004
 9.97 × 10-4
 1.01 × 10-3
 -0.9
 -8.38 × 10-10
 3.34 × 10-5
6.73
 11003
 9.99 × 10-4
 9.99 × 10-4
 0.0
 1.79 × 10-12
 3.69 × 10-6
7.14
 10961
 9.93 × 10-4
 9.69 × 10-4
 2.4
 2.19 × 10-9
 2.67 × 10-5
7.72
 10758
 9.77 × 10-4
 8.82 × 10-4
 9.7
 8.76 × 10-9
 1.72 × 10-4
8.65
 10327
 9.36 × 10-4
 5.85 × 10-4
 37.5
 3.40 × 10-8
 3.52 × 10-4
8.98
 10019
 9.04 × 10-4
 4.33 × 10-4
 52.1
 4.70 × 10-8
 4.44 × 10-4
9.57
 9565
 8.65 × 10-4
 2.20 × 10-4
 74.6
 6.75 × 10-8
 5.64 × 10-4
7.98
 10670
 9.68 × 10-4
 8.49 × 10-4
 12.2
 1.11 × 10-8
 1.04 × 10-4
8.06
 10590
 9.68 × 10-4
 8.60 × 10-4
 11.1
 1.01 × 10-8
 8.95 × 10-5
8.82
 10187
 9.27 × 10-4
 5.25 × 10-4
 43.3
 3.95 × 10-8
 1.05 × 10-4
8.84
 10272
 9.27 × 10-4
 5.05 × 10-4
 45.5
 4.11 × 10-8
 1.54 × 10-4
8.85
 10228
 9.28 × 10-4
 5.30 × 10-4
 42.8
 3.89 × 10-8
 1.46 × 10-4
8.91
 10160
 9.27 × 10-4
 5.14 × 10-4
 44.6
 4.07 × 10-8
 2.13 × 10-4
9.16
 9992
 9.05 × 10-4
 3.86 × 10-4
 57.3
 5.20 × 10-8
 1.53 × 10-4
9.19
 9967
 9.06 × 10-4
 3.91 × 10-4
 56.8
 5.17 × 10-8
 1.52 × 10-4
9.26
 9767
 8.88 × 10-4
 3.77 × 10-4
 57.5
 5.23 × 10-8
 3.47 × 10-5
9.38
 9961
 9.00 × 10-4
 3.40 × 10-4
 62.2
 5.62 × 10-8
 2.40 × 10-5
9.44
 9849
 8.96 × 10-4
 3.24 × 10-4
 63.8
 5.81 × 10-8
 9.92 × 10-5
9.53
 9822
 8.88 × 10-4
 2.83 × 10-4
 68.2
 6.16 × 10-8
 7.95 × 10-5
9.54
 9787
 8.88 × 10-4
 2.72 × 10-4
 69.4
 6.30 × 10-8
 1.85 × 10-4
9.72
 9461
 8.58 × 10-4
 2.29 × 10-4
 73.3
 6.65 × 10-8
 1.82 × 10-4
Total Sr = 10-4 M aged for 2 days
± 5%

7.08
 11079
 1.00 × 10-4
 1.04 × 10-4
 -3.5
 -3.15 × 10-10
 not measured
6.41
 11063
 1.01 × 10-4
 1.06 × 10-4
 -5.1
 -4.57 × 10-10
 not measured
6.92
 11002
 1.00 × 10-4
 1.09 × 10-4
 -8.9
 -8.11 × 10-10
 not measured
7.02
 10966
 9.99 × 10-5
 1.05 × 10-4
 -5.3
 -4.79 × 10-10
 not measured
7.26
 10922
 9.88 × 10-5
 9.88 × 10-5
 0.0
 4.05 × 10-13
 not measured
7.50
 10712
 9.70 × 10-5
 9.10 × 10-5
 6.2
 5.61 × 10-10
 not measured
8.57
 10078
 9.14 × 10-5
 5.30 × 10-5
 42.2
 3.81 × 10-9
 not measured
9.33
 9404
 8.51 × 10-5
 2.15 × 10-5
 75.2
 6.77 × 10-9
 not measured
9.86
 8585
 7.81 × 10-5
 9.13 × 10-6
 88.7
 8.03 × 10-9
 not measured
Total Sr = 10-5 M aged for 2 days
± 5%

6.21
 10913
 1.05 × 10-5
 1.07 × 10-5
 -1.4
 -1.39 × 10-11
 not measured
6.40
 11302
 1.06 × 10-5
 1.04 × 10-5
 1.2
 1.13 × 10-11
 not measured
6.70
 11458
 1.06 × 10-5
 1.03 × 10-5
 2.0
 1.88 × 10-11
 not measured
7.15
 11367
 1.05 × 10-5
 1.01 × 10-5
 3.8
 3.54 × 10-11
 not measured
6.95
 10918
 1.05 × 10-5
 1.04 × 10-5
 1.0
 9.75 × 10-12
 not measured
7.60
 10844
 1.03 × 10-5
 9.45 × 10-6
 8.5
 8.10 × 10-11
 not measured
7.91
 10811
 1.03 × 10-5
 8.71 × 10-6
 15.1
 1.43 × 10-10
 not measured
8.92
 10175
 9.72 × 10-6
 4.36 × 10-6
 55.2
 5.27 × 10-10
 not measured
9.58
 9544
 9.12 × 10-6
 1.85 × 10-6
 79.7
 7.62 × 10-10
 not measured
Total Sr = 10-6 M aged for 2 days
± 10%

6.52
 11049
 1.59 × 10-6
 1.65 × 10-6
 -3.9
 -5.60 × 10-12
 not measured
6.64
 11038
 1.59 × 10-6
 1.53 × 10-6
 3.4
 4.84 × 10-12
 not measured
6.71
 11025
 1.58 × 10-6
 1.50 × 10-6
 5.4
 7.78 × 10-12
 not measured
6.81
 11019
 1.58 × 10-6
 1.48 × 10-6
 6.7
 9.56 × 10-12
 not measured
6.88
 11030
 1.58 × 10-6
 1.51 × 10-6
 4.5
 6.42 × 10-12
 not measured
7.62
 10867
 1.56 × 10-6
 1.42 × 10-6
 8.8
 1.26 × 10-11
 not measured
8.39
 10590
 1.52 × 10-6
 1.13 × 10-6
 25.3
 3.64 × 10-11
 not measured
9.06
 10235
 1.47 × 10-6
 7.21 × 10-7
 50.9
 7.32 × 10-11
 not measured
9.59
 9873
 1.42 × 10-6
 3.89 × 10-7
 72.5
 1.04 × 10-10
 not measured
Total Sr = 7 × 10-7 M aged for 2 days
± 20%

6.89
 11022
 6.81 × 10-7
 6.46 × 10-7
 5.1
 3.14 × 10-12
 not measured
6.50
 11070
 6.83 × 10-7
 6.57 × 10-7
 3.8
 2.31 × 10-12
 not measured
6.70
 11016
 6.80 × 10-7
 6.82 × 10-7
 -0.3
 -2.12 × 10-13
 not measured
6.43
 11013
 6.80 × 10-7
 7.18 × 10-7
 -5.6
 -3.44 × 10-12
 not measured
7.56
 10685
 6.59 × 10-7
 5.63 × 10-7
 14.7
 9.05 × 10-12
 not measured
7.73
 10508
 6.49 × 10-7
 5.15 × 10-7
 20.6
 1.27 × 10-11
 not measured
8.52
 9978
 6.16 × 10-7
 3.34 × 10-7
 45.7
 2.82 × 10-11
 not measured
9.05
 9538
 5.89 × 10-7
 1.71 × 10-7
 70.9
 4.38 × 10-11
 not measured
9.53
 8920
 5.50 × 10-7
 8.10 × 10-8
 85.3
 5.26 × 10-11
 not measured

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