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Ultrasound-assisted dispersive micro-solid phase extraction using molybdenum disulfide supported on reduced graphene oxide for energy dispersive X-ray fluorescence spectrometric determination of chromium species in water.
| Content Provider | Europe PMC |
|---|---|
| Author | Pytlakowska, Katarzyna Kocot, Karina Pilch, Michał Zubko, Maciej |
| Abstract | Molybdenum disulfide (MoS2) was supported on graphene oxide (GO) by hydrothermal method. The resulting nanocomposite (MoS2-rGO) was characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The experiments show that at pH 2, MoS2-rGO has a great affinity for adsorption of hexavalent chromium ions while Cr(III) ions remain in aqueous sample. In the adsorption process, the dominant role plays chemisorption. The determined adsorption capacity is 583.5 mg g−1. Parameters affecting the extraction process, namely sample pH, sample volume, contact time, and matrix ions, were investigated by sequential batch tests. Under optimal conditions (pH 2, sample volume 50 mL, sonication time 10 min, adsorbent mass 1 mg), the calibration curve covers the 1–200 ng mL−1 range with a correlation coefficient (R2) of 0.998. The recovery of the method is 97 ± 3%. Other data of merit include a relative standard deviation of < 3.5%, enrichment factor of 3350, and detection limit of 0.050 ng mL−1. The accuracy of the method was confirmed by analysis of the reference materials QC1453 (chromium VI in drinking water) and QC3015 (chromium VI in seawater). The method was successfully applied to chromium speciation in water samples, including high salinity ones. The concentration of Cr(III) was calculated as the difference between the total concentration of chromium (after oxidation of Cr(III) to Cr(VI) with potassium permanganate) and the initial Cr(VI) content.Graphical abstractSchematic presentation of a method for determination of chromium species by energy dispersive X-ray fluorescence spectrometry after preconcentration on molybdenum disulfide supported on reduced graphene oxide.Electronic supplementary materialThe online version of this article (10.1007/s00604-020-04476-4) contains supplementary material, which is available to authorized users. |
| Related Links | https://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC7467914&blobtype=pdf |
| ISSN | 00263672 |
| Journal | Mikrochimica Acta [Mikrochim Acta] |
| Volume Number | 187 |
| DOI | 10.1007/s00604-020-04476-4 |
| PubMed Central reference number | PMC7467914 |
| Issue Number | 9 |
| PubMed reference number | 32880021 |
| e-ISSN | 14365073 |
| Language | English |
| Publisher | Springer Vienna |
| Publisher Date | 2020-09-02 |
| Publisher Place | Vienna |
| Access Restriction | Open |
| Rights License | Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2020 |
| Subject Keyword | Preconcentration Hexavalent chromium determination Chromium speciation EDXRF Environmental samples |
| Content Type | Text |
| Resource Type | Article |
| Subject | Analytical Chemistry |
