Ivchenko N. Indicator films based on hardened gelatin gel with immobilized hydroxyxanthene dyes and complexing reagents

The thesis is devoted to the investigation of characteristics of hardened gelatin gel as reaction medium and the creation of the principles of obtaining the new optical transparent indicator films with immobilized complexing reagents nitroso-R-salt (NRS), eriochrome cyanine R (EChC), pyrocatechol violet (PCV), alizarin red S (AR) and nitchromazo for the spectrophotometric and visual-test determination of the metals in aqueous mediums. The probe of gelatin matrix of photo film with hydroxyxanthene dyes eosin, ethyleosin, n-decyleosin, n-decylfluorescein at pH before and after isoelectric point revealed of the same sign medium effects as in ultramicrogeterogeneous SAS solutions with corresponding type of charge. The principles of immobilization of complexing reagents (NRS, EChC, PCV, AR, nitchromazo) in hardened gelatin gel of commercial photo film were stated. The quantitative characteristics of extraction of Al(III), Fe(III), Cu(II), Co(II) and Ni(II) by the investigated solid-phase reagents were estimated. The possibilities of using indicator films with EchC, PCV, AR for the solid-phase spectrophotometric and visual-test Al(III) determination, the films with nitroso-R-salt - for Со(II), Fe(III), Cu(II), Ni(II) and their sum determination in aqueous mediums were estimated. Indicator films with nitchromazo can be applied for the photometric determination of the sum of Ba(II) and Sr(II) and indirect determination of SO42- in natural waters.