Abstract
The effect of cationic surfactants (cetyltrimethylammonium bromide, cetylpyridinium bromide, and tetrabutylammonium perchlorate) and a nonionic surfactant (OP-7) on the conditions of the immobilization of 4-(2-pyridylazo)resorcinol (PAR) on three types of silica gel (Silochrom S-120 (200–350 μm), Silochrom S-120 (315–500 μm), and Silochrom S-80 (200–350 μm)) was studied. It was found that OP-7 does not affect the adsorption of surfactants. The effect of cationic surfactants increases in the order tetrabutylammonium perchlorate < cetyltrimethylammonium bromide < cetylpyridinium bromide. The adsorption activity of silica gels increases in the order Silochrom S-120 (315–500 μm) < Silochrom S-80 (200–350 μm) < Silochrom S-120 (200–350 μm). Cetylpyridinium bromide provides full immobilization of PAR on silica gel Silochrom S-120 (200–350 μm) in the pH range 2–9.
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