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

中文翻译：

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含硫基团化学修饰的二氧化硅，用于分离和预富集分光光度法测定贵金属

提出了用许多含硫基团（巯基丙基，巯基苯基，二丙基二硫，噻二唑硫醇，二硫代氨基甲酸酯和硫脲衍生物）进行化学改性的二氧化硅，用于分离和预浓缩贵金属。这些吸附剂从0.5到4 M的盐酸溶液中定量提取了贵金属。它可以将它们与高浓度的有色金属，碱土金属，碱金属和其他一些相关金属分离。在配体取代反应中将动力学不稳定的贵金属离子与动力学惰性的金属离子分离的选择性取决于吸附剂官能团中硫原子的性质，并在从硫酮转变为硫醇硫时增加。提出了在矿石，精矿及其加工产品中进行原子吸收光谱法，ICP-OES和ICP-MS测定之前，使用经含硫基团化学修饰的二氧化硅对金属进行预浓缩的方法。通过对认证参考材料的分析，证实了所开发方法的正确性。