Determination of manganese in diesel, gasoline and naphtha by graphite furnace atomic absorption spectrometry using microemulsion medium for sample stabilization

Brandão, Geisamanda Pedrini; Campos, Reinaldo Calixto de; Castro, Eustáquio Vinícius Ribeiro de; Jesus, Honério Coutinho de

doi:10.1016/j.sab.2008.04.019

Cited by 32 publications

(16 citation statements)

References 25 publications

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“…A common solvent (co-solvent) was used to obtain a homogeneous mixture between the aqueous and the oily medium. The selected cosolvent was propan-1-ol and this choice was based on previous experiences in the preparation of microemulsions of petrol and diesel when determining trace metals using atomic spectrometry [10]. The kerosene content was fixed to 10% (in volume) and in order to try to obtain stable and homogeneous systems, the content of the aqueous phase was varied from 2.5 to 15% with final composition achieved with a complementary volume of the common solvent (propan-1-ol).…”

Section: Microemulsion Compositionmentioning

confidence: 99%

Bismuth Film Anodic Stripping Voltammetry for the Determination of Lead in Kerosene: A Metrological Study

et al. 2010

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Anodic stripping voltammetry and bismuth film electrode (BFE) were used to develop a method for the determination of lead in a complex sample (kerosene) prepared as a stable microemulsion. The method allowed the sensitive determination of lead with a quantification limit, in the sample, of 1.4 Â 10 À7 mol L À1 employing a 240 s accumulation time. Fortified sample analysis enabled the average analyte recovery around 99% which was statistically similar to the one achieved using a reference method (atomic absorption spectrometry). A detailed metrological evaluation was made including the calculation of the uncertainty associated to the voltammetric measurement indicating that repeatability (variations in the formation of different films and in the behavior of the analyte in the prepared microemulsions) is the main contribution of measurement uncertainty.

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Section: Microemulsion Compositionmentioning

confidence: 99%

Bismuth Film Anodic Stripping Voltammetry for the Determination of Lead in Kerosene: A Metrological Study

et al. 2010

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“…A number of techniques such as inductively coupled plasma-mass spectrometry (ICP-MS) [8], anodic stripping voltammetry [9][10][11], atomic absorption spectroscopy (AAS) [12], X-ray fluorescence [13], ICP-AES, glassy carbon electrodes [14][15][16] and cathodic stripping voltammetry [17][18][19] are used for its determination. These techniques are sophisticated, time consuming and require large infrastructure back up and expertise and are therefore cumbersome for the analysis of Mn 2+ in large number of samples.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on fabrication of Mn2+ selective polymeric membrane electrode and coated graphite electrode

Singh¹,

Bandi²,

Upadhyay³

et al. 2013

Materials Science and Engineering: C

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“…14,[30][31][32] Acid digestion is time consuming, presents risks of losses of analyte and sample contamination, and also requires the use of corrosive and hazardous reagents; thus it is the least suitable for routine work, although it allows instrument calibration with aqueous calibration solutions. Sample dilution with organic solvents offers speed and simplicity, but the toxicity of these solvents is an obstacle regarding its use, as well as the low stability of the analyte in these solutions, 6,[33][34][35][36] higher organic loads, difficulties in calibration and dilution are implicit to the procedure. Emulsion or microemulsion formation is also simple and quick; it provides greater analyte stability compared to organic solvent dilution and also allows, in some cases, calibration with aqueous calibration solutions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of different pre-treatment procedures for the determination of chromium in crude oil samples by GF AAS

Pessoa

Lyra

Castro

et al. 2012

J. Braz. Chem. Soc.

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No presente estudo, três procedimentos de pré-tratamento e determinação de Cr por GF AAS foram desenvolvidos e comparados: diluição da amostra com tolueno, formação de emulsão e amostragem direta do petróleo. Os limites de detecção para os procedimentos desenvolvidos foram 1,9 ng g -1 para a diluição da amostra com tolueno, 2,8 ng g -1 para a formação de emulsão e 0,73 ng g -1 para a amostragem direta. A exatidão dos três procedimentos foi avaliada analisando-se o material NIST1085b e por testes de recuperação. Em todos os procedimentos foram obtidos altos valores de recuperação e boa concordância entre os teores determinados e os teores certificados. No entanto, os resultados indicam que a diluição da amostra com tolueno não é recomendada para amostras com grau API abaixo de 15. Os outros dois procedimentos mostraram o mesmo desempenho para as amostras com diferentes graus API (8-38), mas a amostragem direta apresentou melhor sensibilidade além de minimizar as chances de perdas do analito ou contaminação.In the present study three pre-treatment procedures were developed and compared following Cr determination by GF AAS: sample dilution with toluene, emulsion formation and direct sampling of crude oil. The limits of detection for the developed procedures were 1.9 ng g -1 for sample dilution with toluene, 2.8 ng g -1 for emulsion formation and 0.73 ng g -1 for direct sampling. The accuracy of the three procedures was assessed by analysis of NIST1085b and recovery tests. High recoveries and good agreement between found and certified values were obtained in all cases. However, results indicate that sample dilution with toluene is not recommended for samples below 15ºAPI. The other two procedures showed the same performance for the samples with different API degrees (8 to 38), but the direct sampling showed better sensitivity besides minimizing the chances of analyte losses or contamination.

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Determination of manganese in diesel, gasoline and naphtha by graphite furnace atomic absorption spectrometry using microemulsion medium for sample stabilization

Cited by 32 publications

References 25 publications

Bismuth Film Anodic Stripping Voltammetry for the Determination of Lead in Kerosene: A Metrological Study

Bismuth Film Anodic Stripping Voltammetry for the Determination of Lead in Kerosene: A Metrological Study

A comparative study on fabrication of Mn2+ selective polymeric membrane electrode and coated graphite electrode

Comparison of different pre-treatment procedures for the determination of chromium in crude oil samples by GF AAS

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