Silica Gel and Cellulose Loaded with Bis-Quaternary Ammonium Salts as Sensitive Reagents for Iron, Bismuth and Anionic Surfactants Determination in Water

Abstract Sorption of some high molecular weight bis-quaternary ammonium salts (QAS) on silica gel and cellulose was investigated. It was shown that QAS were not washed practically from the sorbents surface at pH = 1 – 9. Sorption of bismuth tetraiodide and iron (III) thiocyanate complexes and anionic dye — picric acid (Picr) onto silica gel modified with QAS was studied. The solid-phase reagents for bismuth(III) and iron (III) spectroscopic and visual test determination in natural water were worked out. Detection limits of Bi (III) and Fe (III) determination were 3 and 2 μg.l−1, respectively. Indicator paper for Fe(III) determination in different types of water was obtained. Silica gel modified with QAS and Picrate was used for determination of anionic surfactants in natural and waste waters using spectrophotometric and visual test methods. The detection limit was 0.05 μg.l−1