ИСТИНА

In this work we demonstrate several ways of improving and manipulating selectivity of covalently-bonded polymer-based anion exchangers for IC. The proposed approaches include insertion of polar and negatively charged substitutes into the ion-exchange functional layer as well as variation of the branching degree and hydrophilicity of such layer, the structure of amine in its inner and outer parts, and the type of quaternizing agent for such amine. Some interesting temperature effects on the separation of weakly retained organic acids are observed for several types of covalently-bonded stationary phases, which provide the possibility to significantly improve the resolution for certain pairs of analytes.