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The immobilization of silica gel surface with Eriochrome black-T indicator (ERT) for the formation of silica-ERT phase is described. The surface coverage of silica gel, based on carbon and nitrogen analysis of the modified silica gel phase, is 0.38 mmol g -1 . The stability towards hydrolysis of silica-ERT phase in different buffer solutions (pH 1-10) is studied and evaluated. The...
A method for immobilization of 5-formyl-3-arylazosalicylic acid derivatives on the surface of silica gel is described. The new silica gel phases were synthesized by a very simple and rapid route which can be defined as a one-step reaction. The phases were proved to show an excellent improvement in the iron (III) extraction and the determined mmol g -1 values are in the range of 1.24-1...
The immobilization of formylsalicylic acid compounds on the surface of amino group-containing silica gel phases is described. The resulting phases were tested for the extraction of iron(III) and showed an exchange capacity of 0.95-0.96 mmol g -1 . The other metal ions tested showed lower metal capacity values than iron(III). The selectivity of the phases tested for the extraction of...
The hydrogen/deuterium (H/D) exchange process in fused-silica capillary columns was extensively studied using two old and two new columns. The compounds selected for this study were mixtures of phenol and monodeuteriophenol with different compositions. The factors controlling and influencing this phenomenon, such as heating rate and flow-rate variation as a function of residence time on the internal...
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