Preconcentration and Determination of Precious Metals using Silica Gel Chemically Modified with Products of Interaction of o- or p-Aminotiophenols with g-(Trietoxisilane)propylisocyanate A.K. Trofimchuk*†, V.N. Losev‡, V.V. Parfenova‡, E.V. Elsuf’ev‡, N.V. Gudymа§
	* Corresponding authors † Taras Shevchenko National university of Kyiv, 64, Volodymirska Str, 01033, Kyiv, Ukraine; ‡ Scientific research engineering centre “Kristall” Siberian Federal University, Svobodnyi pr. 79, 660041, Krasnoyarsk, Russian Federation § F.D. Ovcharenko institute of Biocolloid Chemistry NAS of Ukraine, Vernadsky Ave. 42, 03142, Kyiv, Ukraine *e-mail: aktrof27@gmail.com
	Methods Objects Chem. Anal., 2020, 15(2), p. 53-65 https://doi.org/10.17721/moca.2020.53-65
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Abstract

The synthesis of new complexing adsorbents with thiophenol (MPhS) and aminobenzthiazolpropyl (ABTS) groups grafted onto the surface of silica gels are considered. The extraction of precious metals (Au(III), Ag(I), Pd(II), Pt(II,IV), Rh(III), Ir(IV), Ru(IV), Os(IV)) from solutions of hydrochloric acid by MPhS and ABTS adsorbents. Contact time, acidity, temperature (25 – 95 °C), and the presence of a labilization agent tin(II) chloride is examined. It is shown that the adsorption properties of MPhS for precious metals are better than ABTS. It was proved by luminescence spectroscopy that gold, silver and platinum in the surface complexes with sulfur-containing groups are in lower oxidation states; and by the EPR method it was proved that ruthenium and osmium in surface complexes are in oxidation state +3. The formation of luminescent Ag(I), Au(I) and Pt(II) complexes on the surface of the MPhS, colored Ru(III) complexes on the surface of MPhS and ABTS, and mixed-ligand complexes of Pt(II) with surface aminobenzthiazole groups and Michler’s thioketone were used for developing methods of their adsorption-luminescent, adsorption-photometric and test determinatio

Keywords: silica gels, complexing adsorbents, precious metals, adsorption-photometric determination

Article language: Rus