Solid-phase extraction and fluorimetric determination of Zn (II) in natural water using novel adsorbent based on silica modified with polyhexamethylene guanidine and Ferron

Abstract

Novel silica-based adsorbent layer-by-layer modified with polyhexamethylene guanidine and 7-iodine-8-hydroxyquinoline-5-sulphonic acid (Ferron) was used for preconcentration and adsorption-fluorimetric determination of Zn(II). A simple and express method for adsorbent preparation is described in the present work. The prepared adsorbent extracts Zn(II) from solutions with pH of 5.0–7.0, with the formation of a luminescent complex λlum = 500 nm (λex = 380 nm) on the surface. An adsorption-fluorimetric method was developed for determination of Zn(II) in natural water using adsorbent sequentially modified with polyhexamethylene guanidine and Ferron; detection limit was 4 µg L−1. The procedure was used for the analysis of water from rivers and artesian wells of the Krasnoyarsk Krai (Russia).