Abstract
An approach to the simultaneous isolation of As(III) and Se(IV) from solutions on a new S,N-containing sorbent followed by determination of the analyte in the sorbent phase by total reflection X-ray fluorescence (TXRF) is proposed. To match the goal, a sorbent with a branched structure is synthesized on the basis of polyacrylamide modified with formaldehyde and hydrogen sulfide. This is a heteroatomic copolymer containing sulfide bridges and crosslinking by a tertiary amine in its chain. Conditions for the quantitative coextraction of As(III) and Se(IV), namely, sorption in 1 M solutions of HNO3 in the presence of calcium ions, heating up to 60°C, and phase contact time of 1 h, are determined. The mechanism of sorption interaction of the analytes under specified conditions is discussed. It is found that 100-fold excesses of iron, zinc, and copper do not interfere with the extraction of the analytes; therefore, it is possible to apply the sorbent for the extraction of As(III) and Se(IV) from different types of raw materials and processed products. A procedure for the direct X-ray fluorescence quantification of arsenic and selenium with Sr of 0.09 and 0.08, respectively, in the sorbent phase is developed. The correctness of the results is confirmed by ICP-MS upon the analysis of aqueous reference solutions after the dissolution of the sorbate in HNO3 (1 : 1).
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Funding
The utilization of an S2 PICOFOX TXRF spectrometer was supported by the Development Program of the Moscow State University (X-ray fluorescence spectrometer Tornado M4 plus).
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Translated by E. Boltukhina
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Filatova, D.G., Arkhipenko, A.A., Statkus, M.A. et al. Sorption of As(III) and Se(IV) from Aqueous Solutions for Subsequent Determination by Total Reflection X-Ray Fluorescence. Inorg Mater 58, 1435–1438 (2022). https://doi.org/10.1134/S0020168522140060
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DOI: https://doi.org/10.1134/S0020168522140060