On the Features of Sorption Concentration of Ru on Super-Crosslinked Polystyrenes during the Analysis of Rocks by the Method of Inductively Coupled Plasma Mass Spectrometry

Аннотация

New sorption systems based on a series of super-crosslinked polystyrenes of brands HP and Styrosorb for the concentration of Ru from the solutions obtained after decomposition of rocks are studied. To extract Ru according to a reversed-phase mechanism, aromatic amines (methylbenzylamine (MBA), dimethylbenzylamine (DMBA), dibenzylmethylamine (DBMA)), as well as aliphatic tributylamine (TBA), are used for the first time. It is shown that reverse 60% extraction of Ru from the standardized test solution can be reached in the Styrosorb-514–TBA–1M HCl sorption system in ethanol as a desorption agent. An important role of sample preparation of a solid sample is revealed by the analysis of the reference standards (RSs) of ultrabasic and basic rocks. It is found that, for the quantitative (100%) extraction of Ru in the selected sorption system, the only suitable way of transferring a solid sample to a solution is smelting to NiS matte followed by dissolving of the matte in aqua regia and transferring it to concentrated HCl. The influence of Ni during the mass spectrometric determination of Ru by ⁹⁹Ru in a broad range of concentrations (20–2000 μg/L) is studied; it is shown that the presence of Ni does not make the Ru concentration too high. The conducted experiments have displayed the possibility for using the sorption system based on Styrosorb-514 when estimating the low content of Ru in rock samples, which is confirmed by the analysis of the reference standards of ultrabasic and basic rocks GPt-5, GPt-6, and SARM-7. The obtained data on Ru content in these objects coincide with the certified values within the confidence interval.