Optimization of an open-focused microwave oven digestion procedure for determination of metals in diesel oil by inductively coupled plasma optical emission spectrometry

Sant’Ana, Flavio W.; Santelli, Ricardo Erthal; Cassella, Alessandra R.; Cassella, Ricardo J.

doi:10.1016/j.jhazmat.2007.03.045

Cited by 33 publications

(20 citation statements)

References 33 publications

(43 reference statements)

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“…However the loss of Hg was verified when samples were decomposed in the FM oven. Sant ' Ana et al (2007) reported focused microwave assisted procedure for the wet acid dissolution of diesel oil for the determination of metals in samples. The dissolution process was monitored by measuring residual carbon content (RCC) after application of digestion program.…”

Section: Wet Digestion Assisted By Microwave Radiationmentioning

confidence: 99%

Determination of Metal Ions in Crude Oils

Khuhawar¹,

Mirza²,

Jahangir³

2012

Crude Oil Emulsions- Composition Stability and Characterization

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Section: Wet Digestion Assisted By Microwave Radiationmentioning

confidence: 99%

Determination of Metal Ions in Crude Oils

Khuhawar¹,

Mirza²,

Jahangir³

2012

Crude Oil Emulsions- Composition Stability and Characterization

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“…Although the amount of sample in vessels is limited due to the generation of gaseous reaction products that can increase of pressure, the use of closed high-pressure vessels is appropriate for efficient sample digestion. On the other hand, in the use of open-focused microwave ovens, the advantages are decreasing the risk to the operator, possible introduction of reagents during procedure, opportunity to digest larger amounts of sample and low cooling time (Sant'Ana et al, 2007).…”

Section: Acid Digestionmentioning

confidence: 99%

“…Microwave-assisted digestion has been performed to dissolve the oil sample for elemental analysis in a large number of papers (Angioni et al, 2006;Ansari et al, 2009;Levine et al, 1999;Llorent-Martinez et al, 2011a, 2011bMendil et al, 2009;Sant'Ana et al, 2007), while focused microwave assisted digestion for the same purpose has been employed in a few papers (Sant'Ana et al, 2007). As shown in Table 1, some investigation have been done on microwave digestion for olive oil using various procedures.…”

Section: Acid Digestionmentioning

confidence: 99%

Metal Determinations in Olive Oil

Yaşar¹,

Baran²,

Alkan³

2012

Olive Oil - Constituents, Quality, Health Properties and Bioconversions

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“…However, the limitation in the use of this acid is its low boiling point at atmospheric pressure, around 120 o C. To facilitate digestion in open flasks that operate at atmospheric pressure, the addition of an aliquot of sulfuric acid is recommended (which has a boiling point of 330 °C), thereby increasing the oxidative efficiency of the medium and making the decomposition of fat globules possible. [14][15][16][17][18][19][20] Ideally, the best digestion should lead to a complete decomposition of organic material using minimal amounts of nitric acid which should be diluted as much as possible to decrease residual carbon and the acid concentration in the resulting digest solution, with the aim of avoiding critical effects on instrument parts, such as the nebulizer, nebulization chamber and torch in ICP OES. 11 Furthermore, solutions of differing viscosity and surface tension lead to changes in the flow rates of aspiration and nebulization, while the density and volatility affect the transport of the aerosol through the nebulization chamber.…”

Section: Evaluation Of the Efficiency Of Digestionmentioning

confidence: 99%

Evaluation of digestion procedures for simultaneous determination of Ca, P, Mg, K and Na in biodiesel by inductively coupled plasma optical emission spectrometry

Korn¹,

Santos²,

Guida³

et al. 2010

J. Braz. Chem. Soc.

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Neste trabalho foi avaliada a eficiência de dois procedimentos para digestão ácida de amostras de biodiesel visando à determinação de Ca, P, Mg, K e Na por espectrometria de emissão óptica com plasma acoplado indutivamente com configuração axial (ICP OES). Nas digestões em sistema aberto, foi utilizada a mistura contendo ácidos nítrico, sulfúrico e peróxido de hidrogênio e aquecimento condutivo; enquanto que no procedimento empregando forno de microondas com cavidade foi utilizada a mistura contendo ácido nítrico e peróxido de hidrogênio. Os procedimentos foram avaliados considerando-se limites de quantificação, precisão, acidez final dos digeridos e teor de carbono residual. Os teores de carbono residual nos digeridos foram 0,358 ± 0,012% para o sistema aberto com aquecimento convencional e 0,614 ± 0,023% para o sistema fechado com aquecimento assistido por radiação microondas, o que demonstra a alta eficiência dos procedimentos propostos. O sistema de digestão em forno de microondas com cavidade resultou em maior rapidez, segurança e resultados analíticos com percentuais de recuperação de 89,0-103,0% e desvios menores que 5%. Os limites de detecção obtidos, ≤ 0.40 µg g -1 , são adequados para a determinação dos analitos, conforme os limites estabelecidos na legislação brasileira. Três amostras de biodiesel produzidas de diferentes fontes foram analisadas. Em comparação com outros procedimentos propostos na literatura, o procedimento desenvolvido usando forno de microondas com cavidade apresenta vantagens, tais como não necessitar de soluções orgânicas para calibração e não usar solventes orgânicos tóxicos.In the present work, the efficiency of two procedures for the digestion of biodiesel was investigated for the simultaneous determination of Ca, P, Mg, K and Na by axial view ICP OES. In the open system with conventional heating, concentrated nitric and sulfuric acids were added to the samples, and the addition of hydrogen peroxide completed the digestion. In the microwave-assisted closed system, complete digestion was performed using concentrated nitric acid and hydrogen peroxide. The analytical performances were evaluated through limits of quantification, precision of the overall procedures, final acidity of the digests, and residual carbon contents. The contents of residual carbon for the biodiesel samples digested were 0.358 ± 0.012% using the open system with conventional heating and 0.614 ± 0.023% using the microwave-assisted closed vessel system, demonstrating the high efficiency of both proposed procedures. The optimized microwave-assisted decomposition procedure produced the fastest, safest and most accurate analytical results with recoveries of 89.0-103.0% and deviations lower than 5% in most cases. Low limits of detection were obtained (≤ 0.40 µg g -1 ), adequate for the established limits set out in Brazilian legislation for these analytes. Three biodiesel samples produced from different oil sources were analyzed. In comparison with other procedures proposed in the literature, the developed procedu...

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Optimization of an open-focused microwave oven digestion procedure for determination of metals in diesel oil by inductively coupled plasma optical emission spectrometry

Cited by 33 publications

References 33 publications

Determination of Metal Ions in Crude Oils

Determination of Metal Ions in Crude Oils

Metal Determinations in Olive Oil

Evaluation of digestion procedures for simultaneous determination of Ca, P, Mg, K and Na in biodiesel by inductively coupled plasma optical emission spectrometry

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