On the Specificity of Sorption Preconcentration of Ru on the Hyper-Crosslinked Polystyrene Sorbents in Analysis of Rock Samples Using Inductively Coupled Plasma -Mass Spectrometry

New sorption systems based on hyper-crosslinked polystyrenes “HP” and “Stirosorb” are developed for Ru concentration from final solutions after rock decomposition. Aromatic amines (N-methylbenzylamine (MBA), N,N-dimethylbenzylamine (DMBA), N,N-dibenzylmetylamine (DBMA)) and aliphatic tributylamine (TBA) are used for the first time for Ru extraction from the solutions via reversephase mechanism. The reproducible 60% extraction of Ru from a model solution can be achieved using sorbent system Stirisorb-514, reagent TBA and eluent 1 M HCl in ethanol. An important role of solid sample processing in analysis of CRM (Certified Reference Materials) of ultrabasic and basic rock samples is demonstrated. Reproducible quantitative (100%) extraction of Ru using the aforementioned system is achieved only via NiS fire-assay of a solid rock sample followed by the matte digestion in aq. reg. and final dilution in HCl_conc. The reasons for remarkable difference in the efficiency of Ru extraction from model solutions and final solutions after solid rock samples digestion are investigated. The interference effect of Ni upon MS determination of Ru by⁹⁹Ru is studied in a wide range of Ni concentration (20 -2000 ^g/liter). The interference effect of Ni on the signal of Ru is considered negligible. The obtained results proved the possibility of using developed scheme for determination of Ru in rock samples. The developed extraction scheme is validated in analysis of CRMs: GPt-5, GPt-6 and SARM-7. The results of Ru determination in three CRM using the developed scheme match the certified values within the range of experimental errors.

рутений, сорбционное концентрирование, сверхсшитый полистирол, обращенно-фазные сорбенты, трибутиламин, ультраосновные горные породы, сплавление в NiS-штейн, масс-спектрометрия с индуктивно-связанной плазмой, ruthenium, sorption preconcentration, hyper-crosslinked polystyrene, reversed-phase sorbents, tributylamine, ultrabasic rocks, NiS fire-assay, inductively coupled plasma-mass spectrometry

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