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Table 1 Adsorbed amounts of SDS and DFOB on goethite (SDSads, DFOBads) as influenced by the total SDS concentration (SDStot) in suspension at pH 6.

From: Adsorption of hydroxamate siderophores and EDTA on goethite in the presence of the surfactant sodium dodecyl sulfate

SDStot SDSads Δ(SDSads) DFOBads Δ(DFOBads) Δ(DFOBads)/Δ(SDSads)
(μM) --------------------------- (μmol/m2) -----------------------------  
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
  1. The goethite concentration was 7 g/L and the total DFOB concentration was 80 μM.
  2. 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.