Analytic control of the content of platinum group elements in multicomponent systems
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ANALYTIC CONTROL OF THE CONTENT OF PLATINUM GROUP ELEMENTS IN MULTICOMPONENT SYSTEMS H. M. Mykhalyna,1,2 T. Ya. Vrublevs’ka,1 M.B. Urys’,1 and Yu. Ya. Lutsyshyn1
UDC 543.422.3:547.565:546.96,97
The interaction of iridium (IV) with luteolin and the interaction of rhodium (ІІІ) with quercetin are investigated for the first time. We determine optimal conditions for the formation of these compounds and their metrological characteristics and selectivity in the presence of certain ions. On the basis of the results obtained, we develop new methods for the determination of the contents of iridium and rhodium, check them for artificial solutions, and test in the analysis of Tb 2 Ir3Al 9 and Gd 2 Ir3Al 9 intermetallic compounds and a rhodium-containing resistor ( Sr ≤ 0.023). Keywords: iridium (IV), rhodium (ІІІ), flavonoids, spectrophotometry, intermetallic compounds, resistor.
The development of electric and radio engineering requires materials of highest quality, which is guaranteed, in particular, by the experimental verification of their quality, composition, and possible contamination in the course of synthesis [1]. Among these materials are synthesized intermetallic compounds, namely, light alloys based on aluminum with a small content of modifying components such as platinum group elements, in particular, iridium and rhodium. This explains the importance of the investigation of the behavior of these components in the analysis of the indicated objects. Materials, Equipment, and Experimental Technique All aqueous solutions were prepared using the distillate. We used a standard solution of Ir(IV) with TIr = 995 g/liter produced by the Aldrich Company (Germany). The initial standard chloride solution of Rh(III) was prepared by sintering the metallic rhodium (99.9%) with fivefold excess of an oxidizing mixture (NaNO 3 + NaOH at ratio 3:1) at 700°С for 2 h and further dissolution of the alloy in a 3 М hydrochloric acid. The solutions were spectrophotometrically identified by comparing their electron light-absorption spectra with the data available in the literature [2], which confirm the domination of rhodium in the form of complex ions [RhCl 6 ]3– . Rhodium (ІІІ) solutions were standardized by the Syrokoms’kyi–Proshenkova titrimetric method based on the capability of Rh(III) to be oxidized by bismuthate to Rh(V) in sulfate acid solutions [3]. The samples were synthesized by alloying compact metals [with the contents of the main components ≥ 99.86 Gd, ≥ 99.83 Tb, ≥ 99.9 Ir, and ≥ 99.99 Al (in mass %)] in an electric arc furnace and homogenized at 600°C for 720 h with further hardening. The Gd 2 Ir3Al 9 and Tb 2 Ir3Al 9 alloys were studied by the X-ray powder method on a STOE STADI P diffractometer [4]. We prepared quercetin solutions by the dissolution of an accurately weighted sample of a reagent produced by the CHEMAPOL Company (Czech Republic), and the luteolin solutions by the dissolution of the analytically pure FSZ DFU reagent (Ukraine) in 96% ethanol. To maintain 1 2
Franko Lviv National University, Lviv, Ukraine.
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