The utility of a W–Ir permanent chemical modifier for the determination of Ni and V in emulsified fuel oils and naphtha by transverse heated electrothermal atomic absorption spectrometer

Meeravali, Noorbasha N.; Kumar, Sunil

doi:10.1039/b100032m

Cited by 59 publications

(30 citation statements)

References 24 publications

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“…The concentrations found in the digested samples were consistently lower than those found in the microemulsified samples due to a possible loss of analyte during digestion. This is because the microwave used here has a semiopen configuration, and despite the reflux, the analyte may have undergone particle evaporation (Meeravali  Kumar, 2001). Sample S 5 (washed animal fat) did not show the same quantifiable concentration of Cd in the two procedures (Tables 13 and 15).…”

Section: Samplementioning

confidence: 89%

“…One of the most relevant aspects to consider is the phenomenon of corrosion in the combustion chamber of automotive engines, which is caused by high temperatures and by the fuels themselves (Amorim et al, 2007;Jesus et al, 2008;Haseeb et al, 2010;Saint´Pierre et al, 2006). The deactivation of catalysts through poisoning, incrustation or solid-state transformations, which lead to reduced selectivity and loss of catalytic activity, may also result in economic losses and environmental impacts (Figueiredo  Ribeiro, 1987;Meeravali  Kumar, 2001;Saint´Pierre et al, 2004). The quality of fuels supplied to the consumer, from their production to their distribution points, can be managed by means of the efficient analytical control of incidental or accidental inorganic additives (Oliveira et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analytical Methodology for the Determination of Trace Metals in Biodiesel

Lobo¹,

Goveia²,

Fraceto³

et al. 2011

Biodiesel- Quality, Emissions and by-Products

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Section: Samplementioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Analytical Methodology for the Determination of Trace Metals in Biodiesel

Lobo¹,

Goveia²,

Fraceto³

et al. 2011

Biodiesel- Quality, Emissions and by-Products

View full text Add to dashboard Cite

“…Souza and da Silveira (2006) reported detergentless emulsions for the determination of elements in crude oils by using acidified water for element stabilization and propan-1-ol as a co-solvent. Meeravali and Kumar (2001) determined Ni and V in naphtha and fuel oils after emulsion formation. The oil samples were diluted in toluene, and this solution was emulsified by stirring with 3% Triton X-100 in water.…”

Section: Preparation Of Emulsionmentioning

confidence: 99%

Determination of Metal Ions in Crude Oils

Khuhawar¹,

Mirza²,

Jahangir³

2012

Crude Oil Emulsions- Composition Stability and Characterization

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“…12 Vanadium is one of the most abundant metals in petroleum and has been evaluated carefully in order to reduce problems during the industrial production process, since it is a catalyst poisoning and causes corrosion. 13 Considering the importance of vanadium, several methods have been proposed for its determination in crude oil [14][15][16][17][18] and petroleum products, such as: lubricating oil, 19,20 heavy oil, 21,22 diesel and asphaltene, 8 naphtha and gas oil, 23,24 gasoline. 25 The content of vanadium in fuel oil has to be controlled because it can cause incrustation, corrosion and also efficiency loss in furnaces and boilers, 26 besides its contribution to the environmental pollution 27 and of cause problems to human health.…”

Section: Introductionmentioning

confidence: 99%

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

Amorim

Lima

Amaro

et al. 2007

J. Braz. Chem. Soc.

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Dois métodos para determinação de vanádio em óleo combustível são propostos utilizando GF AAS. O primeiro é baseado na preparação de uma microemulsão da amostra que é diretamente injetada no tubo de grafite. As temperaturas de pirólise e atomização, 1500 e 2700 °C, respectivamente, foram otimizadas a partir das curvas de temperatura. Para este procedimento obteve-se um limite de detecção de 0,10 μg g -1 e uma massa característica de 87 pg. O outro método utiliza digestão da amostra com ácido sulfúrico, ácido nítrico e peróxido de hidrogênio. As temperaturas de pirólise e atomização, otimizadas, foram 1000 e 2700 °C, respectivamente. Para este procedimento, obteve-se um limite de detecção de 0,25 μg g -1 e uma massa característica de 63 pg. A exatidão de ambos os métodos foi confirmada pela análise do material de referência certificado NIST SRM 1634c-trace metals in fuel oil.Two methods for vanadium determination in fuel oil are proposed using GF AAS. The first is based on the preparation of a microemulsion followed by direct injection into the graphite tube. The pyrolysis and atomization temperatures, 1500 and 2700 °C, respectively, were chosen from the temperature curves. This procedure allows determination of vanadium with a detection limit of 0.10 μg g -1 and characteristic mass of 87 pg. The other method uses total acid digestion of the sample with sulfuric acid, nitric acid and hydrogen peroxide. In this procedure, the pyrolysis and atomization temperatures recommended were 1000 and 2700 °C, respectively. Among the analytical characteristics for this method are a detection limit of 0.25 μg g -1 and a characteristic mass of 63 pg. The accuracy of both procedures was confirmed by the determination of vanadium in the certified reference material NIST SRM 1634c-trace metals in fuel oil.Keywords: vanadium, fuel oil, microemulsion, digestion sample, GF AAS IntroductionThe determination of metals and non-metals in petroleum and its derivatives is of great interest regarding the quality of oil and for environmental aspects. The most difficult part is usually the sample preparation, the most reliable procedure being ashing of the sample and analysis of the residue after taking up in hydrochloric acid. 1 However, this procedure is quite tedious and requires careful control to avoid analyte losses, and even microwave-assisted digestion procedures require relatively long time. 2 Graphite Furnace Atomic Absorption Spectrometry (GF AAS) is offering advantages over other techniques since the results from a simple dilution with an organic solvent and ashing were found to be practically identical. 3,4 However, stability of metal concentration in sample and calibration solutions might become a serious problem 1567 Amorim et al. Vol. 18, No. 8, 2007 under these conditions. 5,6 The formation and analysis of an oil-in-water emulsion or microemulsion instead of a dilution of the oil sample with an organic solvent has been proposed to avoid this problem. [7][8][9][10][11] Fuel oil is a highly viscous residual fraction of petrol...

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The utility of a W–Ir permanent chemical modifier for the determination of Ni and V in emulsified fuel oils and naphtha by transverse heated electrothermal atomic absorption spectrometer

Cited by 59 publications

References 24 publications

Analytical Methodology for the Determination of Trace Metals in Biodiesel

Analytical Methodology for the Determination of Trace Metals in Biodiesel

Determination of Metal Ions in Crude Oils

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

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