METHODS AND OBJECTS OF CHEMICAL ANALYSIS ISSN title: "Metody i obʺekty himičeskogo analiza" An international journal devoted to all aspects of Analytical chemistry ISSN 2413-6166 (Online), ISSN 1991-0290 (Print)
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DETERMINATION OF REE AND SOME TOXIC ELEMENTS IN MINE WATERS OF DONETSK REGION BY GD-MS

V.D.Kurochkin¹, O.M.Romanenko¹, M.O.Skulskiy²

¹Frantsevich Institute for Problems of Materials Science NAS of Ukraine, 3, Krzhyzhanovsky str., 03680, Kyiv-142, Ukraine, e-mail: vkur46@gmail.com,

²Institute of environmental geochemistry NAS of Ukraine 34A, Palladin Ave., 03680, Kyiv-142, Ukraine

The paper discusses influence of the molecular ions on the detection limit at determination of REE and some toxic elements in mine waters of the Donetsk region using glow discharge mass-spectrometry (GD-MS). High resolution mass spectrometer was used to study impact of individual molecular ions formed from components of the sample and discharge gas Ar. Mass spectra were calculated in the area of masses of isotope studied and the most suitable isotopes were selected. It is shown that the sensitivity of analysis depends on the overall composition and isotope and is within 0.1 - 20 ppb at resolving power of the instrument of the order of 5000. Simulation of mass-spectra allows avoiding erroneous interpretation of mass spectra and correctly estimate detection limit of analysis.

Key words: Glow discharge mass-spectrometry, molecular ions, simulation of mass-spectra, mine waters, detection limit

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