Fast sequential determination of manganese and chromium in vegetable oil and biodiesel samples by high-resolution continuum source graphite furnace atomic absorption spectrometry

Almeida, Jorge S.; Brandão, Geovani Cardoso; Santos, Gabriel Luiz dos; Teixeira, Leonardo Sena Gomes

doi:10.1039/c6ay00165c

Cited by 18 publications

(4 citation statements)

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“…The maximum concentrations were found to be 166 μg kg –1 for Cd, 106 μg kg –1 for Cr, 137 μg kg –1 for Pb, 82 μg kg –1 for V, and 92 μg kg –1 for Mo. Previous works have also reported values at the μg kg –1 level for the five target elements. ,,,− The presence of some transition metals, even in low concentrations, could promote the oxidation of biodiesel, leading to adversely affect engines operation through corrosion, deposit formation, and fuel injection failure. In addition, toxic metals can be considered environmental pollutants since these species can be released into the atmosphere during the burn of the fuel …”

Section: Resultsmentioning

confidence: 95%

“…Due to the low concentrations of metals in biodiesel samples, the metals determination requires the use of sensitive analytical techniques. − Therefore, in general, techniques used for this objective are typically inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma optical emission spectrometry (ICP OES), and electrothermal atomic absorption spectrometry (ET AAS). − However, sample preparation is a critical step because of the high organic content of the biodiesel samples and, in general, requires the organic matrix destruction by a time-consuming digestion procedure using concentrated acids and heating . As an alternative, new analytical methods need to be proposed that avoid hazardous, drastic, and longtime sample pretreatments.…”

Section: Introductionmentioning

confidence: 99%

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Biodiesel Trace Element Analysis by Energy Dispersive X-ray Fluorescence Spectrometry Using Magnetic Solid-Phase Microextraction

et al. 2020

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One parameter to examine biodiesel quality has to do with the existence of metals, given that their presence can negatively affect fuel stability, by virtue of the alteration to their physicochemical properties. Given the significance of monitoring the concentration of metals in biodiesel, this work is aimed at developing a different mode for multielement determination through the use of energy dispersive X-ray fluorescence (EDXRF) spectrometry. For this purpose, an extraction procedure using sample preparation by emulsification associated with magnetic solid-phase microextraction was proposed for separation of Cd, Pb, Cr, V, and Mo from biodiesel samples for posterior analysis using EDXRF spectrometry. The emulsion was prepared by mixing the sample with n-propyl alcohol and 0.01 mol L −1 nitric acid alongside subsequent contact with the solid phase (CoFe 2 O 4 nanoparticles impregnated with alizarin fluorine blue). Constrained mixing design was used to optimize the emulsion composition, and the recommended conditions were 36% (v v −1 ) n-propyl alcohol, 42% (v v −1 ) biodiesel, and 22% (v v −1 ) nitric acid solution for a total volume of 10 mL, using 100 mg of nanoparticles. The proposed extraction allowed enrichment factors of 9.3, 23, 27, 9.7, and 10 for Cd, Cr, V, Pb, and Mo, respectively. The limits of detection were found to be 13, 32, 17, 14, and 25 μg kg −1 for Cd, Pb, Cr, V, and Mo, respectively. Recovery tests were performed by adding 200 μg kg −1 of all analytes in question to six varying biodiesel samples with outcomes that registered between 85 and 114%. The recommended procedure was applied in the analysis of biodiesel, and the highest concentrations observed were 166 μg kg −1 for Cd, 106 μg kg −1 for Cr, 137 μg kg −1 for Pb, 82 μg kg −1 for V, and 92 μg kg −1 for Mo.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Biodiesel Trace Element Analysis by Energy Dispersive X-ray Fluorescence Spectrometry Using Magnetic Solid-Phase Microextraction

et al. 2020

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“…The variance in these results was evaluated through the F test, being comparable (F calculated 1.55 and F critical 3.44). The averages were compared through paired Student's t-test, t calculated of 9.03 and t critical Although the use of chemical modifiers may be unnecessary for the determination of Chromium due to its refractory behavior, the use of relatively low pyrolysis temperatures can influence the elimination of complex matrices [24][25][26]. The use of modifiers such as magnesium nitrate, Mg(NO 3 ) 2 , is reported in the literature for Chromium determination in different types of matrices, allowing the thermal stabilization of the analyte during the pyrolysis step without sensitivity losses, thus justifying its use [25,26].…”

Section: R E S U L T S a N D Discussionmentioning

confidence: 99%

Evaluation of Chromium and Manganese levels in sports supplements using graphite furnace atomic absorption spectrometry

et al. 2020

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Objective In this paper, we studied three different types of ordinary sports supplements containing whey protein: whey protein-based ones, hypercaloric ones, and protein bars. Methods A sample preparation procedure was studied employing microwave-assisted wet digestion in order to determine the Chromium and Manganese levels by graphite furnace atomic absorption spectrometry. Results The developed methods have presented good accuracy (recoveries in the range of 90% to 109%) and precision (Relative standard deviation <8%). Although an adequate detectability was obtained (50ng g-1 for Manganese and 65ng g-1 for Chromium), the sample preparation method was also adequate to inductively coupled plasma mass spectrometry analysis. The method was applied to 26 commercial samples, in which the Chromium concentrations were in the range between 0.22 and 1.0μg g-1 and the Manganese concentrations varied from 2.0 to 37μg g-1. Conclusion The results obtained by atomic absorption for both analytes were in agreement with those obtained by mass spectrometry. In addition, some samples presented concentrations of Chromium above the recommended daily intake and, as a result, we used the X-ray powder diffraction technique as an analytical tool to evaluate the oxidation state of Chromium in such samples.

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“…For example, dilution of biodiesel with ethanol allows for using inorganic standards and aqueous solutions in elemental determination by microwave-induced plasma optical emission spectrometry (MIP OES) and EC (Amais et al, 2013 ). Dilution of biodiesel and vegetable oil with isobutyl ketone is also compatible with EC using aqueous standards and determination by high resolution-continuum source GF AAS (HR-CS GF AAS; Almeida et al, 2016 ). Photo-oxidation by UV radiation is another strategy to minimize matrix effects and allow for using inorganic-matrix aqueous standard solutions in fruit juice analysis by F AAS and EC (Brandão et al, 2012 ).…”

Section: Traditional Calibration Methodsmentioning

confidence: 99%

Traditional Calibration Methods in Atomic Spectrometry and New Calibration Strategies for Inductively Coupled Plasma Mass Spectrometry

Carter¹,

Barros²,

Nóbrega³

et al. 2018

Front. Chem.

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Fast sequential determination of manganese and chromium in vegetable oil and biodiesel samples by high-resolution continuum source graphite furnace atomic absorption spectrometry

Abstract: HR-CS GF AAS was used for the sequential determination of Mn and Cr in vegetable oil and biodiesel samples.

Cited by 18 publications

References 20 publications

Biodiesel Trace Element Analysis by Energy Dispersive X-ray Fluorescence Spectrometry Using Magnetic Solid-Phase Microextraction

Biodiesel Trace Element Analysis by Energy Dispersive X-ray Fluorescence Spectrometry Using Magnetic Solid-Phase Microextraction

Evaluation of Chromium and Manganese levels in sports supplements using graphite furnace atomic absorption spectrometry

Traditional Calibration Methods in Atomic Spectrometry and New Calibration Strategies for Inductively Coupled Plasma Mass Spectrometry

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