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Functionalized adsorbents with poly-(4,9-dioxododecane-1,12-guanidine) (SiO2-PDDG) and mercaptophenyl groups (MPhS) were used for the separation of Se(VI) and Se(IV) for the first time. Fixation of PDDG was characterized by capillary electrophoresis...

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Silica gel chemically modified with dithiocarbamate groups (DTCS) was used for separation and preconcentration of precious metals and their subsequent determination in geological samples and their processing products by inductively coupled plasma optical emission spectrometry and inductively coupled plasma mass-spectrometry. DTCS was characterized by TGA/DSC, FT-IR, and CHNS-analysis. DTCS quantitatively extracted Au 3+ , Pd 2+ , Pt 2+ , Pt 4+ at 20°C from 0.5-4.0 M HCl media and Rh 3+ , Ir 4+ , Ru 4+ ,Os 4+ at 95°C in the presence of 0.025M SnCl 2. Two-column procedure was proposed to separate precious metals from matrix components and to separate kinetically inert precious metals from kinetically labile ones.

A simple and available method for on-line preparation of the adsorbent and solid phase extraction procedure for multi-element determination by inductively coupled plasma mass spectrometry (ICP-MS) has been proposed. The adsorbent (Al 2 O 3 -PB-AC) was synthesised by sequential impregnation of Al 2 O 3 with Polybrene (PB) and Alizarin Complexone (AC). Cd(II), Cr(III), Ni(II), Pb(II) and Zn(II) were quantitatively recovered using Al 2 O 3 -PВ-AC from aqueous solutions at pH 6.5 and at a flow rate of 1.0 mL min −1 . All the elements can easily be eluted by 3.0 mL 0.5 M HNO 3 . A mini-column packed with 0.100 g Al 2 O 3 -PB-AC retained all elements quantitatively from up to 50 mL multi-element solution with an enrichment factor of 16.7. The relative standard deviation for five replicate determinations was 3.5%, 7.3%, 6.2%, 7.4% and 4.7% for Cd(II), Cr(III), Ni(II), Pb(II) and Zn(II), respectively, for determination of 5 μg L −1 level. The developed method was applied for SPE-ICP-MS determination of Cd, Cr, Ni, Pb, Zn in snow and river waters.