Table 1 |
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|
Adsorbed amounts of SDS and DFOB on goethite (SDSads, DFOBads) as influenced by the total SDS concentration (SDStot) in suspension at pH 6. |
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|
SDStot |
SDSads |
Δ(SDSads) |
DFOBads |
Δ(DFOBads) |
Δ(DFOBads)/Δ(SDSads) |
|
(μM) |
--------------------------- (μmol/m2) ----------------------------- |
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|
|
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|
0 |
0.000 |
--- |
0.047 |
--- |
--- |
|
50 |
0.054 |
0.054 |
0.077 |
0.030 |
0.56 |
|
100 |
0.107 |
0.054 |
0.091 |
0.014 |
0.25 |
|
200 |
0.214 |
0.107 |
0.105 |
0.014 |
0.13 |
|
400 |
0.439 |
0.224 |
0.142 |
0.037 |
0.17 |
|
600 |
0.781 |
0.342 |
0.171 |
0.029 |
0.08 |
|
|
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|
The goethite concentration was 7 g/L and the total DFOB concentration was 80 μM. The SDS adsorption data were taken from [21] and were measured in the absence of DFOB. Δ(SDSads) and Δ(DFOBads) denote the additional SDS and DFOB adsorbed relative to the next lower SDStot concentration. The ratio Δ(DFOBads)/Δ(SDSads) is an estimate for the additional amount of DFOB adsorbed due to additional adsorption of SDS to the goethite surface. |
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|
Carrasco et al. Geochemical Transactions 2009 10:5 doi:10.1186/1467-4866-10-5 |
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