Silicas Chemically Modified with Sulfur-Containing Groups for Separation and Preconcentration of Precious Metals Followed by Spectrometric Determination

Silicas chemically modified with a number of sulfur-containing groups (mercaptopropyl, mercaptophenyl, dipropyl disulfide, thiadiazole thiol, dithiocarbamate and thiourea derivatives) were proposed for the separation preconcentration precious metals. These adsorbents quantitatively extracted metals from 0.5 to 4 M solutions hydrochloric acid. It allowed their high concentrations non-ferrous, alkaline earth, alkali some other related The selectivity kinetically labile metal ions in ligand substitution reactions inert ones depended on nature sulfur atom within functional group increased when passing thione thiol sulfur. Approaches using silicas prior AAS, ICP-OES, ICP-MS determination ores, concentrates processing products proposed. correctness developed methods was confirmed by analysis certified reference materials.