The concentration (hemi-micelles or ad-micelles) of surfactant aggregates on mineral oxides mainly depend on the surfactant/oxide weight ratio. Their influence on the percentage of complexed ions adsolubilized was investigated by passing 250 mL of a solution containing 50 g of
each ion through solid phase containing various amounts of SDS, 1 g -Al2O3 and 20 mg DABDAMA at pH 7. The results obtained are presented in Fig. 3. In the absence of SDS, ions were not retained on DABDAMA-alumina. The retention of metal ions on hemi-micelles, which have a hydrophobic surface, was clearly dependent on analyte complex polarity. Therefore, addition of SDS is necessary. The formation of minute amounts of ad-micelles was essential to achieve complete adsolubilization of these ions as a respective complex. At surfactant concentrations higher than about 50 mg/g alumina, a decrease in the percentage of ions retained was observed as a result of the formation of micelles (Fig. 3).
The concentration (hemi-micelles or ad-micelles) of surfactant aggregates on mineral oxides mainly depend on the surfactant/oxide weight ratio. Their influence on the percentage of complexed ions adsolubilized was investigated by passing 250 mL of a solution containing 50 g ofeach ion through solid phase containing various amounts of SDS, 1 g -Al2O3 and 20 mg DABDAMA at pH 7. The results obtained are presented in Fig. 3. In the absence of SDS, ions were not retained on DABDAMA-alumina. The retention of metal ions on hemi-micelles, which have a hydrophobic surface, was clearly dependent on analyte complex polarity. Therefore, addition of SDS is necessary. The formation of minute amounts of ad-micelles was essential to achieve complete adsolubilization of these ions as a respective complex. At surfactant concentrations higher than about 50 mg/g alumina, a decrease in the percentage of ions retained was observed as a result of the formation of micelles (Fig. 3).
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