SORPTION PRECONCENTRATION OF EU(III) IONS FROM CsI SOLUTIONS BY SILICA GEL IMPREGNATED WITH 5,11,17,23-TETRAKIS(DIISOPRPOXYPHOSPHORYLMETHYL) 25,26,27,28-TETRAHYDROXYTHIACALIX[4]ARENE M.S. Lukashova*†, S.G. Kharchenko‡, K.N. Belikov†‡, E.Yu. Bryleva†, N.N. Grebenyuk†, I. B. Shcherbakov†, V.I. Kalchenko§
	* Corresponding authors † State Scientific Institution “Institute of Single Crystals”, National Academy of Sciences of Ukraine, Lenin ave., 60, 61001, Kharkiv, Ukraine ‡ Department of Inorganic Chemistry, V.N. Karazin Kharkiv National University, Svobody sq. 4, 61122, Kharkiv, Ukraine § Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska str., 5, 02660, Kyiv, Ukraine E-mail: lukashova@isc.kharkov.com
	Methods Objects Chem. Anal., 2015, 10(3), p. 143-149 https://doi.org/10.17721/moca.2015.143-149
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Abstract

A novel selective sorption material allowing 99% Eu(III) recovery from Csl solutions was obtained by non-covalent immobilization of 5,11,17,23-tetrakis(diisoprpoxyphosphorylmethyl)25,26,27,28- tetrahydroxythiacalix[4]arene on silanized silica gel surface. According to the elemental analysis, the material contains 10 wt.% of thiacalixarene; specific surface area of the material under study is ~300 m2/g. The maximum recovery rate of Eu(III) ions is achieved within the pH range of 5.5–6.5 with the contact time of 24 h and is practically independent of CsI concentration in solution. The Eu(III) ions distribution coefficient reached 14.6 L/g. It was found that quantitative desorption of Eu(III) ions from the sorbent surface was ensured by using 1.5 M HNO3 solution as an eluent. The sorption preconcentration procedure followed by ICP-OES determination of Eu(III) in CsI single crystals and CsI raw material within the Eu(III) concentration range of 5∙10-7-1∙10-5 wt.% with the relative standard deviation as low as 5% was developed.

Keywords: CsI, Eu(III), thiacalix[4]arene sorption, atomic emission spectrometry, silica gel

Article language: Rus