Features of test reactions of metal ions with Chromazurol S immobilized on thin-layer matrices

Abstract

Features of the reactivity of Chromazurol S immobilized on paper, clothes of natural and artificial cellulose fibers, silk, and nylon were studied. A weak retention of Chromazurol S on cellulose matrices and nylon (retention is 10–60%) and high retention on silk (>70%) were found. Upon the adsorption of the reagent on solid matrices, a bathochromic shift of absorption bands is observed in comparison with its absorption in solutions. The analysis of sorption isotherms and IR spectra suggested that the reagent can be fixed on the matrix by hydrogen bonds, electrostatic forces, and hydrophobic interactions. An increased ability of the complexes of metal ions with Chromazurol S to adsorb on the matrices was noted; a significant (100–130 nm) bathochromic shift of the absorption bands in comparison with the absorption of the complexes in aqueous solutions is observed in this case, and the number of ligands coordinated by the metal ion also increases. Based on the study of the sorption isotherms and absorption spectra in the visible and IR regions for complexes, the assumption of the hydrophobic hydration of the resulting complexes in the intermicellar space of the matrix was suggested. Test reactions of Chromazurol S immobilized on paper, viscose, and silk with Al, Be, Fe(III), Zr(IV), and Cr(III) ions were studied.