Ion flotation method for the preparative sample treatment before chemical measurements was reviewed.
Ion flotation is an adsorptive bubble separation technique. It is based on the fact that surface active materials have the property of adsorption on the surface, in this case, gas-liquid interface.
The method could be applied when 1) the solute to be measured become easily surface active after reacted with a complexing agent or else, 2) the formation of ion pair between the solute and a surface active agent is possible.
In this paper, typical examples were shown to understand the variety of the methods. They are collective separations of metal ions using complexing agents and surfactants, those of anions through derivatizing them to be hydrophobic, and the solvent sublation method, in which the solvent put on the sample solution extracts the ion pairs coming up with the bubbles.
Further, a new method for the selective collection of solutes using surface active cyclodextrin which has the capability of molecular recognition was proposed with preliminary results.
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