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Extraction Concentration of the Acid-Soluble Forms of Rare Earth Elements from Oils of the Volga-Ural Petroleum Province Using Rotating Coiled Columns

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Abstract

Trace elements in oils are the natural markers of the source of its origin and the mechanism of genesis. Direct determination of rare earth elements (REEs) in crude oils is rather difficult owing to their low concentrations (10–6 wt %). Information about the forms of trace elements in oils is of particular interest. The goal of the study is to determine the content of acid-soluble forms of REEs in oils from various fields of the Volga-Ural petroleum province. Six samples of oils of heavy and medium density and viscosity were analyzed. Extraction of acid-soluble forms of REEs was carried out using rotating coiled columns in 0.5 M aqueous solution of nitric acid. Toluene was used to dilute the oils until reaching the necessary values of the density and viscosity to allow for the extraction in the oil–aqueous acid solution system. The REEs were identified by the method of inductively coupled plasma mass spectrometry (ICP-MS): their content in the acid-soluble form in the oil samples under study ranged within 172–2173 ng/kg. Such a wide range of values is attributed to the difference in the geology and age of deposit formation. The highest content of acid-soluble REE forms (2173 ng/kg) was detected in the oil sample from the Novo-Elkhovskoe field, whereas the lowest value (172 ng/kg) was in the oil sample of the Pionerskoe field. It is shown that the content of acid-soluble forms of REEs depends on tectonic zoning, productive horizons, and pay zones, as well as on physicochemical properties of oils. The distribution of acid-soluble forms of light and heavy REEs is evaluated. Most of the REEs (75–99%) detected in the analyzed oil samples are light REEs. It is noted that systematization of the data on the properties of oils and geological and geochemical characteristics of the deposit will provide reliable forecasting of the various forms of REEs present in oils.

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Funding

This work was supported by the state task no. 0137-2019-0020.

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Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    E. Yu. Savonina, O. N. Katasonova & T. A. Maryutina

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  1. E. Yu. Savonina
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  2. O. N. Katasonova
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  3. T. A. Maryutina
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Correspondence to E. Yu. Savonina.

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Translated by L. Mukhortova

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Savonina, E.Y., Katasonova, O.N. & Maryutina, T.A. Extraction Concentration of the Acid-Soluble Forms of Rare Earth Elements from Oils of the Volga-Ural Petroleum Province Using Rotating Coiled Columns. Inorg Mater 58, 1479–1483 (2022). https://doi.org/10.1134/S0020168522140126

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