Skip navigation

Please use this identifier to cite or link to this item:
Title: 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
Authors: Pytlakowska, Katarzyna
Kocot, Karina
Pilch, Michał
Zubko, Maciej
Keywords: Preconcentration; Hexavalent chromium determination; Chromium speciation; EDXRF; Environmental samples
Issue Date: 2020
Citation: "Microchimica Acta, Analytical Sciences Based on Micro- and Nanomaterials" Vol. 187, iss. 9 (2020), art. no. 542
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.
DOI: 10.1007/s00604-020-04476-4
ISSN: 0026-3672
Appears in Collections:Artykuły (WNŚiT)

Files in This Item:
File Description SizeFormat 
Pytlakowska_Article_Ultrasound_assisted_dispersive_micro_solid_phase_extraction_using.pdf1,46 MBAdobe PDFView/Open
Show full item record

Uznanie Autorstwa 3.0 Polska Creative Commons License Creative Commons