A simple electroanalytical procedure for the determination of calcium in biodiesel

Almeida, Joseany M. S.; Dornellas, Rafael M.; Yotsumoto-Neto, Sakae; Ghisi, Mirela; Furtado, Jethânia Glasses Cutrim; Marques, Edmar P.; Aucélio, Ricardo Q.; Marques, Aldaléa Lopes Brandes

doi:10.1016/j.fuel.2013.07.088

Cited by 28 publications

(12 citation statements)

References 28 publications

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“…Regarding the fuel purity, biodiesel contaminants are a major concern. The contaminants include metals [7][8][9], water [10], fatty acid methyl esters [11], sulphur [12], mono-,di-and triacylglycerides and free and total glycerol [13], methanol and ethanol [14], as well as iodine [15]. An important quality parameter for commercialization of biodiesel is the water content.…”

Section: Introductionmentioning

confidence: 99%

“…There are many established analytical methods for determining the quality parameters of biodiesel to ensure the good performance of the fuel and engines [7][8][9][10][11][12][13][14][15]. For water content analysis, the Karl Fisher method is the most widely adopted, but requires a sophisticated titrator, expensive reagents and qualified personnel to operate the equipment [19,20].…”

Section: Introductionmentioning

confidence: 99%

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A simple and fast method to determine water content in biodiesel by electrochemical impedance spectroscopy

Delfino

Pereira

Viégas

et al. 2018

Talanta

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In this paper, a fast, simple and new alternative method for determination of water content (moisture) in biodiesel using electrochemical impedance spectroscopy (EIS) is developed. The method is based on the sensitive variation of the charge transfer resistance (R) of the biodiesel medium in the presence of different quantities of water. To obtain an accurate analytical measurement, a pre-treatment based on a simple dilution by acetonitrile is employed. The two identical Pt electrodes are used in the measurement cell filled with sample solution. The experiment conditions are also optimized for the measurements. The obtained analytical linear curve between the water content and EIS impedance is the basis for the water content analysis in biodesiel fuel. The EIS method is then successfully applied to both real and certified samples, and the results confirm that the method is reliable with high sensitivity, precision and accuracy. The comparison of EIS method with the official standard method is also made through the Student test t, demonstrating that both methods are statistically consistent and similars. The validation of such an EIS method confirms that the method presented for the fist time in this paper can be succesessfully applied to determining the water content of biodiesel fuel.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A simple and fast method to determine water content in biodiesel by electrochemical impedance spectroscopy

Delfino

Pereira

Viégas

et al. 2018

Talanta

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“…18 These high values of Ca could have also been introduced into biodiesel during the purification process or could have come from the washing water, since Ca is insoluble in soap. 15,18 The Ca contents obtained in this study were higher when compared with the values found for biodiesel samples studied by other authors. 15,19 The Mg levels in samples were below the LOD.…”

Section: Concentrations Of Elements In Biodiesel Samplesmentioning

confidence: 99%

Determination of Ca, Mg, Na, and K in Biodiesel of Oilseed from Northern Brazil

Alves¹,

Carvalho²,

Cruz³

et al. 2018

Rev. Virtual Quim.

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http://rvq.sbq.org.br Determinação de Ca, Mg, Na e K em Biodiesel de Oleaginosas do Norte do Brasil Resumo: Neste estudo, a espectrometria de absorção atômica com chamas (FAAS) foi utilizada para determinar os teores de cálcio (Ca), magnésio (Mg), sódio (Na) e potássio (K) em biodiesel produzido com diferentes oleaginosas (bacaba, bacuri, castanha-do-brasil e palma). As amostras foram digeridas com ácido nítrico, ácido sulfúrico e peróxido de hidrogênio usando sistema aberto com aquecimento convencional. As recuperações obtidas pelo método de adição e recuperação para Ca, Mg, Na e K foram de 86-113%, 81-101%, 96-118% e 89-119%, respectivamente. Os resultados mostraram níveis de Ca e Na variando entre 58,56-126,6 mg kg-1 e 3,06-4,61 mg kg-1 nas amostras. Os níveis de Mg nas amostras estavam abaixo do limite de detecção. Teores de K foram encontrados apenas nas amostras B2 e B4. Este estudo mostrou que tanto a oleaginosa quanto o catalisador utilizado na produção do biodiesel durante o processo de síntese podem influenciar as concentrações finais dos metais nas amostras de biodiesel.

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“…The quantification of metals in biofuels is usually based on atomic absorption techniques 6, with direct sample analysis 7, 8, or in conjunction with pre‐concentration techniques, in which the sample passes through a column packed with a complexing agent 9, 10 and is subsequently eluted for analysis. On the other hand electrochemical techniques have also been successfully applied in the determination of metal trace in petroleum fuels 11, 12, and biofuels 13, 14.…”

Section: Introductionmentioning

confidence: 99%

Electrode Based on Nickel‐containing SBA‐15 for the Determination of Copper in Ethanol Biofuel

et al. 2015

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A sensor based in a graphite–polyurethane composite electrode modified with the mesoporous nanostructured silica with hexagonal array of pores called Santa Barbara Amorphous type material (SBA‐15) containing nickel was built. The presence of Ni, incorporated during the synthesis of SBA‐15, resulted in an increase in sensitivity when compared to the other electrodes based on the unmodified SBA‐15. A procedure was proposed for the determination of Cu2+ in ethanol biofuel by square wave stripping voltammetry with linear response in concentration levels of 1.0×10−8 and 1.0×10−7 mol L−1, resulting in a limit of detection of 1.83×10−10 mol L−1 and precision (RSD) of 2.09 %.

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A simple electroanalytical procedure for the determination of calcium in biodiesel

Cited by 28 publications

References 28 publications

A simple and fast method to determine water content in biodiesel by electrochemical impedance spectroscopy

A simple and fast method to determine water content in biodiesel by electrochemical impedance spectroscopy

Determination of Ca, Mg, Na, and K in Biodiesel of Oilseed from Northern Brazil

Electrode Based on Nickel‐containing SBA‐15 for the Determination of Copper in Ethanol Biofuel

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