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Separation,speciation and quantification of both chromium(Ⅵ)and chromium(Ⅲ)in tanned leather samples:a comparative study and validation of analytical methods

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Collagen and Leather 2023年第2期5卷 51-66页

作者： Mónica Gisel Arellano-Sánchez Juliette Vievard Lamia Moufarrej Christine Devouge-Boyer Marie Hubert-Roux Carlos Afonso Mélanie Mignot COBRA UMR CNRS 6014 INSANormandie UniversityUNIROUENAvenue de l'Université76800 Saint-Etienne-du-RouvrayFrance COBRA UMR CNRS 6014IRCOFNormandie UniversityUNIROUEN76821 Mont-Saint-Aignan CedexFrance

In the present work,a comparative study of analytical methods for the simultaneous and quantitative determination of trivalent and hexavalent chromium is *** the analysis by ion chromatography-inductively coupled plasma-mass spectrometry,two different columns were tested,as well as different mobile phases and different pH of the *** optimized analytical method permitted the separation of Cr(Ⅲ)and Cr(Ⅵ)using 75 mmol/L NH_(4)NO_(3)pH 3 as chromatographic *** method was validated and applied to real samples,allowing the determination of both species simultaneously,even when there is a huge difference of concentration between Cr(Ⅲ)and Cr(Ⅵ).Limit of detection and limit of quantification for Cr(Ⅲ)were found to be 0.016 and 0.054μg/L(0.3 and 1.1μg/kg),respectively,and for Cr(Ⅵ)0.13 and 0.43μg/L(7 and 22μg/kg),*** species interconversions were monitored through the use of chromium isotopic standards,which confirmed that the optimized methodology preserves chromium speciation during extraction and ***-transform ion cyclotron resonance-mass spectrometry permitted the structure elucidation of the complex formed during ethylenediaminetetraacetic acid extraction.

关键词： chromium speciation Tanned leather Interconversions Ion chromatography Inductively coupled plasmamass spectrometry Fourier-transform ion cyclotron resonance mass spectrometry

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Investigation of Hexavalent chromium Reduction in Strong Saline and Acidic Nitro-Phosphate Solutions

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Journal of Analytical Sciences, Methods and Instrumentation 2024年第1期14卷 1-13页

作者： Deniz Avsar Niels Højmark Andersen Dag Øistein Eriksen Jon Petter Omtvedt Department of Chemistry University of Oslo Oslo Norway

Phosphorus fertilizers from less pure sedimentary sources become increasingly important, due to depletion of phosphorus from igneous rock of high quality. Consequently, robust methods with potential to remove various types of hazardous elements are required. Among such impurities, hexavalent chromium (Cr(VI)) is very likely to become a future challenge. Different industrial ways to treat phosphate rock are currently being practised, and we have here studied how chromium behaves when using the nitro-phosphate process. The reduction mechanism of Cr (VI) in nitric acid and phosphoric acid solutions was investigated by measuring redox potential and UV-VIS spectra. The results show that Cr (VI) is not stable in strong nitric acid solutions. Reduction of Cr (VI) species decreased with decreasing temperature, NO2 concentration, ionic strength and absence of light. These findings support the proposed reduction reaction:The reduction rate was observed proportional to the nitric acid decomposition: .

关键词： Nitro-Phosphate Fertilizers chromium (VI) Reduction chromium speciation Ultraviolet-Visible Spectroscopy

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Trace-Level Analysis of Hexavalent chromium in Lake Sediment Samples Using Ion Chromatography Tandem Mass Spectrometry

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Journal of Environmental Protection 2016年第3期7卷 422-434页

作者： Stefanie Mädler Fengrong Sun Cindy Tat Nadya Sudakova Peter Drouin Robert J. Tooley Eric J. Reiner Teresa A. Switzer Richard Dyer H. M. Skip Kingston Matt Pamuku Vasile I. Furdui Laboratory Services Branch Ontario Ministry of the Environment and Climate Change Ontario Canada Conservation Ontario Ontario Canada Department of Chemistry University of Toronto Ontario Canada Ontario Geological Survey Ontario Ministry of Northern Development and Mines Ontario Canada Department of Chemistry and Biochemistry Duquesne University Pittsburgh USA Applied Isotope Technologies Pittsburgh USA

The analysis of hexavalent chromium, Cr(VI), in soil and sediment samples has been predominantly carried out in materials containing elevated levels. Reliable analysis of trace-level of Cr(VI) in sediment samples remains challenging. Cr(VI) analyses with multipoint calibration and speciated isotope dilution (SID) adapted from U.S. EPA method 6800 were used to measure lower-level Cr(VI) on an ion chromatograph coupled with a tandem mass spectrometer (IC-MS/MS). Lake sediment samples were collected from various locations in Northern Ontario and Cr(VI) was extracted using both alkaline digestion and ethylene diaminetetraacetic acid (EDTA) extraction. Certified reference materials were extracted and analyzed by IC-MS/MS and UV-VIS detection. The SID-MS approach allowed for the quantification of Cr(VI) in samples with concentration levels below 0.5 μg.g-1 wet weight.

关键词： Trace-Level Analysis Ion Chromatography Tandem Mass Spectrometry chromium speciation Speciated Isotope Dilution

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