Methods for vanadium determination in fuel oil by GF AAS with microemulsification and acid digestion sampling

Amorim, Fábio Alan Carqueija; Lima, Daniel de Castro; Amaro, Joana Angélica de Azerêdo; Vale, Maria Goreti R.; Ferreira, Sérgio Luís Costa

doi:10.1590/s0103-50532007000800018

Cited by 18 publications

(5 citation statements)

References 23 publications

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“…HNO 3 5 mL H 2 SO 4 and 5 mL H 2 O 2 2- 25 70–78 < 5 0.052 ICP-MS 11 Fuel oil MAAD V 1 mL conc. HNO 3 and 1 mL H 2 O 2 7.75–19.3 NA < 5 0.250 GFAAS 17 Crude oil MIC Ni and V 6 mL of 5% H 2 O 2 or 6 mL HNO 3 (15.76–33.21) Ni and (1.07- 19.42) V 99–101 < 5 0.200 and 0.100 ICP-OES 35 …”

Section: Resultsmentioning

confidence: 99%

“…The main limitations of MIC are the use of expensive oxygen, quartz vessels and the additional reflux step, which prolongs the digestion 8 . Lastly, MASRC make use of one digestion vessel at a time, which is a huge disadvantage when running a large population sample 17 . In 2015, the use of a novel and green microwave assisted-hydrogen peroxide digestion (MA-HPD) method followed by ICP-OES and ion- chromatographic for quantitative determination of total sulphur in coal samples was developed 18 .…”

Section: Introductionmentioning

confidence: 99%

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Microwave-assisted hydrogen peroxide digestion followed by ICP-OES for determination of metals in selected fuel oils

Mdluli,

Knottenbelt,

Nomngongo

et al. 2024

Sci Rep

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This work describes a greener and cost-effective microwave-assisted hydrogen peroxide digestion (MA-HPD) with the addition of 1 mL of HNO3 (70% v/v) to enhance extraction of selected metals (Al, Ba, Cd, Co, Cr, Cu, Mg, Na, Ni, Pb, Sb, Ti and V) in crude-oil, diesel, gasoline and kerosene samples prior to inductively coupled plasma-optical emission spectroscopic (ICP-OES) analysis. The most influential parameters of the MA-HPD method were investigated by using multivariate optimization tools (two-level full factorial and central composite designs) and fuel oil certified reference material (NIST1634c). The optimum conditions were observed to be 245 ℃ microwave temperature, 25 min digestion time, 0.1 g sample mass and 5 M H2O2 were the optimum digestion conditions with accepted accuracy (104.8–117.7%) and precision (≤ 4.1%). In overall, the metals that reported high concentrations in the crude oil, diesel, gasoline, and kerosene samples were Na (51.94–58.86 mg/kg) and Mg (36.08–47.4 mg/kg), while Cu was the lowest (0.55–2.89 mg/kg). When comparing the obtained concentration levels with other literature reports, a conclusion can be drawn that South Africa is importing oils of reasonable quality.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microwave-assisted hydrogen peroxide digestion followed by ICP-OES for determination of metals in selected fuel oils

Mdluli,

Knottenbelt,

Nomngongo

et al. 2024

Sci Rep

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“…Uma opção seria uma diluição prévia em solvente orgânico para posterior análise, 15,17,19,24 porém como o óleo analisado contém metais provenientes do desgaste físico das peças automotivas e esses não dissolvem em solventes orgânicos, fez-se necessária uma etapa de mineralização das amostras.…”

Section: Análise De Metais Em óLeos Lubrificantesunclassified

Determinação de metais em óleos lubrificantes, provenientes de motores de ônibus urbano, utilizando a FAAS

Coelho¹,

Neto²,

Moura³

et al. 2010

Quím. Nova

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Recebido em 11/12/09; aceito em 12/6/10; publicado na web em 22/9/10 DETERMINATION OF METALS IN LUBRICATING OILS, FROM PUBLIC TRANSPORTATION, USING THE FAAS. This work proposed a procedure to examine ashes produced in burning lubricating oils used in public transportation, in Teresina PI. Sulphanilic acid was added to the oil samples, which were burned at 550 °C for three hours and 650 °C for two hours. The ash solutions were analyzed by FAAS and there were significant differences in the metal contents of the waste oil produced from normal car service. The quantification limits in µg g -1 were 5.9 (Fe), 4.4 (Pb), 1.7 (Ni), 2.1 (Cu), and 1.2 (Zn). The results showed positive accuracy and precision with recoveries between 88 and 108%, and RSD lower than 10%.Keywords: used lubricating oil; metals; flame atomic absorption spectrometry. INTRODUÇÃOOs óleos básicos representam o principal componente da grande maioria dos lubrificantes, perfazendo cerca de 80% da composição. 1Os óleos básicos de origem mineral são ainda os mais empregados em lubrificação, sendo obtidos do petróleo, portanto, suas propriedades se relacionam à natureza do óleo cru que lhes deu origem e ao processo de refinação empregado.2,3 Geralmente consistem de uma mistura de moléculas contendo de 18 a 40 átomos de carbono classificados em parafínicos, aromáticos e naftênicos (cicloparafínicos). Estes óleos básicos além de carbono e hidrogênio podem conter ainda uma pequena porcentagem de compostos contendo heteroátomos como enxofre, nitrogênio ou oxigênio, substituídos em várias estruturas hidrocarbônicas. 4 As principais funções dos lubrificantes são: redução do atrito entre superfícies, prevenção de corrosão e ferrugem, resfriamento pela remoção do calor produzido pelo atrito das peças e limpeza do motor, entre outras. [5][6][7][8] O processo de lubrificação hidrodinâmica com óleo consiste em facilitar o movimento relativo entre superfícies sob carga de trabalho usando um filme de óleo lubrificante entre as mesmas. Uma boa lubrificação depende de algumas propriedades, tais como, tolerância ao aquecimento, condutividade térmica, relação entre temperatura, pressão e viscosidade, solvência, dispersância, detergência, antidesgaste, anticorrosão, propriedades de fricção e capacidade antioxidante, que são importantes para o sucesso da lubrificação. Muitas dessas propriedades são controladas pelos aditivos químicos designados para tais finalidades. 4O aperfeiçoamento das máquinas que operam sob condições severas teve como consequência a necessidade da melhoria das qualidades naturais dos lubrificantes denominados óleos minerais puros.8 Assim, aditivos são incorporados aos óleos lubrificantes para melhorar sua cor, viscosidade, ponto de fluidez, capacidade antidesgaste, propriedades anticorrosivas e antioxidativas.9 Um típico óleo de motor novo é constituído de poliol ésteres (94-97%), antioxidantes (2-4%), antidesgaste/agentes de extrema pressão (1-3%), inibidores de corrosão (<0,5%), inibidores de ferrugem (< 0,5%) e agentes antiespumantes (na ordem de mg...

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“…Acid digestion methods using HCl and H2O2, 12 H2SO4 followed by HNO3 and H2O2, 13 HNO3 and H2O2, 14 had been respectively reported to be valid for determining various elements in fuel samples. However, a longer operating time (several hours or days) and complicate digestion operations are required in these methods, accompanied by the risk of contamination from the digestion vessels and the environment.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Direct Determinations of Na, Mg, K, Ca, P, and S in Biodiesel Fuel by ICP-QMS/QMS after Xylene Dilution: Development and Application of a High-throughput Method for a Homogeneity Assessment of a Candidate Reference Material

2017

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Technology (AIST), is providing chemical and physical metrology service to the world, including the development and providing of CRMs for the analysis of fuels based on a managing system in accordance to the ISO Guide 34:2009. 2 Up to date, the NMIJ has issued RMs and CRMs of sulfur calibrating solutions (NMIJ CRMs 4215-a, 4217-a, 4221-a, NMIJ RM 4216-a) and bioethanol (NMIJ CRM 8301-a) for the analysis of fuels.3 In accordance to the development plan of CRMs for fuel analysis, a CRM for the measurements of water, methanol, density, kinematic viscosity, and regulated elements (Na, Mg, K, Ca, P, and S) was developed by the present authors' group following ISO Guide 35:2006, 4 which is an international technical guide for the development of RMs and CRMs covering general and statistical principles for certification, e.g. the production of candidate RMs, assessments of the homogeneity, stability study, and characterization.Homogeneity is one of the basic requirements for candidate materials of CRM, and the uncertainty of the homogeneity should be studied and combined to obtain the uncertainty of a certified value. 4 According to the ISO Guide 35:2006, 4 "The minimum number of bottles selected at random is between 10 and 30, but should generally not be smaller than 10". Furthermore, at least 3 sub-samples were taken for each bottle to check the reproducibility of the sample pretreatment. Therefore, measurements of over 30 sub-samples are required for a homogeneity assessment of a candidate RM. High throughput and reliable sample pretreatment methods are preferred for such kind of chemical analysis to lower the cost and to improve the working efficiency.The concentrations of Na, Mg, K, Ca, P, and S in biodiesel fuel (BDF) are regulated so as to ensure the engine performance and for environmental conservation.5 As a result, measurements of these elements are required for quality monitoring of the BDF. In responding to this requirement, certifications of the elements' contents were covered by the present candidate RM. In our previous work on the development of CRMs, Na, Mg, K, Ca, and P, were often measured by an inductively coupled plasma optical emission spectrometer (ICP-OES) and an atomic emission spectrometer (AES), 6-8 while S was measured using a total sulfur analyzer attached with a trap and release unit. 9-11 In these methods, the measurement was often carried out at specific 2017 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed. E-mail: yb-zhu@aist.go.jp Inductively coupled plasma tandem quadrupole mass spectrometry (ICP-QMS/QMS) measurements after xylene dilution were investigated as a method for determining the elements (Na, Mg, K, Ca, P, and S) in a biodiesel fuel (BDF) candidate reference material (RM). Optimizations were respectively carried out for the following parameters to obtain the best performance for measurements: O2 flow rate (additional gas to the carrier gas) to ensure complete combustion of the xylene solvent in the plasma, plasma power to obtain ...

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Methods for vanadium determination in fuel oil by GF AAS with microemulsification and acid digestion sampling

Cited by 18 publications

References 23 publications

Microwave-assisted hydrogen peroxide digestion followed by ICP-OES for determination of metals in selected fuel oils

Microwave-assisted hydrogen peroxide digestion followed by ICP-OES for determination of metals in selected fuel oils

Determinação de metais em óleos lubrificantes, provenientes de motores de ônibus urbano, utilizando a FAAS

Simultaneous Direct Determinations of Na, Mg, K, Ca, P, and S in Biodiesel Fuel by ICP-QMS/QMS after Xylene Dilution: Development and Application of a High-throughput Method for a Homogeneity Assessment of a Candidate Reference Material

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