Sorption Preconcentration of Silver for Atomic Absorption Analysis and Antibacterial Properties of the Acid-modified Clinoptilolite – Ag composite V.O. Vasylechko†‡*, V.O. Fedorenko†, O.M. Gromyko†, G.V. Gryshchouk†, Y.M. Kalychak†, S.I. Tistechok†, I.L. Us† and A. Tupys§
	* Corresponding authors † Department of Analytical Chemistry and Department of Genetics and Biotechnology, Ivan Franko National University of Lviv, Universytetska Str., 1, 79000 Lviv, Ukraine; ‡ Department of Natural Sciences and Environment Protection, Lviv University of Trade and Economics, Samchuka Str., 9, 79011 Lviv, Ukraine; § Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury Str., 101, 02-089 Warsaw, Poland *e-mail: vasylechko@ukr.net
	Methods Objects Chem. Anal., 2020, 15(2), p. 73-82 https://doi.org/10.17721/moca.2020.73-82
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Abstract

Sorptive properties of the acid-modified Transcarpathian clinoptilolite towards Ag(I) were studied under dynamic conditions. It was found that the most effective acid-modifier is 1 M HNO3 solution. The sorption capacity value of H-clinoptilolite under the optimal conditions is 6.15 mg of Ag per 1 g of zeolite. The solid-phase extraction procedure with acid-modified clinoptilolite was used to pre-concentrate trace amounts of silver ions in aqueous solutions and then finally to determine them by the atomic absorption method. Due to the acceptable recoveries (≥ 98 %) and RSD values (2.3-4.7 %) for tap and lake water, the developed method can be successfully applied for the determination of trace amounts of silver ions in the presence of major components of water. It was established that the initial form of clinoptilolite has a better antibacterial effect against E. coli than the H-form. However, antagonistic activity against S. aureus was lower than against E. coli in both forms. The combination of different forms of clinoptilolite with Ag(I) increases their antibacterial activity.

Keywords: acid-modified clinoptilolite, preconcentration, silver, solid-phase extraction, antibacterial activity

Article language: En