Direct determination of sodium, potassium, chromium and vanadium in biodiesel fuel by tungsten coil atomic emission spectrometry

Dancsak, Stacia E.; Silva, Sidnei G.; Nóbrega, Joaquim A.; Jones, Bradley T.; Donati, George L.

doi:10.1016/j.aca.2013.10.055

Cited by 23 publications

(17 citation statements)

References 30 publications

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“…Dancsak et al 169 have recently employed tungsten laments extracted from microscope light bulbs to decompose the biodiesel matrix, and atomize and excite the analytes to determine sodium, potassium, chromium and vanadium by tungsten coil atomic emission spectrometry (WCAES). The accuracy was checked by determining Na and K in a biodiesel reference sample and carrying out spike experiments for Cr and V. No statistically signicant differences were observed between reference and determined values for all analytes at a 95% condence level.…”

Section: Analysis By Additional Techniquesmentioning

confidence: 99%

Metal and metalloid determination in biodiesel and bioethanol

Sánchez¹,

Sanchez²,

Lienemann

et al. 2015

J. Anal. At. Spectrom.

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Section: Analysis By Additional Techniquesmentioning

confidence: 99%

Metal and metalloid determination in biodiesel and bioethanol

Sánchez¹,

Sanchez²,

Lienemann

et al. 2015

J. Anal. At. Spectrom.

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“…In a recent work, some changes in the heating program for biodiesel decomposition to prevent sample losses by sample splashing during the heating was proposed for Na, K, Cr and V determination [23]. Additionally, longer steps, lower applied voltages and stop of the flow rate of the purge gas during the drying steps were also implemented for reaching better performance.…”

Section: Heating Program Of Wcaesmentioning

confidence: 99%

Tungsten coil atomic emission spectrometry combined with dispersive liquid–liquid microextraction: A synergistic association for chromium determination in water samples

Vidal

Silva

Canals

et al. 2016

Talanta

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A novel and environmentally friendly analytical method is reported for total chromium determination and chromium speciation in water samples, whereby tungsten coil atomic emission spectrometry (WCAES) is combined with in situ ionic liquid formation dispersive liquid-liquid microextraction (in situ IL-DLLME).A two stage multivariate optimization approach has been developed employing a Plackett-Burman design for screening and selection of the significant factor involved in the in situ IL-DLLME procedure, which was later optimized by means were 3 and 10 µg L -1 , respectively. This is a 233-fold improvement when 2 compared with chromium determination by WCAES without using preconcentration. The repeatability of the proposed method was evaluated at two different spiking levels (10 and 50 µg L -1 ) obtaining coefficients of variation of 11.4 and 3.6% (n=3), respectively. A certified reference material (SRM-1643e NIST) was analysed in order to determine the accuracy of the method for total chromium determination and 112.3% and 2.5 µg L -1 were the recovery (trueness) and standard deviation values, respectively. Tap, bottled mineral and natural mineral waters were analysed at 60 µg L -1 spiking level of total Cr content at two Cr(VI)/Cr(III) ratios, and relative recovery values were ranged between 88 and 112% showing that the matrix has a negligible effect. To our knowledge, this is the first time that combines in situ IL-DLLME and WCAES.

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“…59 High levels of K and Na can be present in biodiesel fuel and contribute to corrosion, reduced performance and shorter engine lifetime. Trace amounts of Cr and V can also increase the emission of pollutants during biodiesel combustion.…”

Section: Fuels and Lubricantsmentioning

confidence: 99%