Title of article
A simple electroanalytical procedure for the determination of calcium in biodiesel
Author/Authors
Almeida، نويسنده , , Joseany M.S. and Dornellas، نويسنده , , Rafael M. and Yotsumoto-Neto، نويسنده , , Sakae and Ghisi، نويسنده , , Mirela and Furtado، نويسنده , , Jethânia G.C. and Marques، نويسنده , , Edmar P. and Aucélio، نويسنده , , Ricardo Q. and Marques، نويسنده , , Aldaléa L.B.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2014
Pages
8
From page
658
To page
665
Abstract
An alternative method is proposed for the determination of calcium in biodiesel samples using square-wave voltammetry and a glassy carbon electrode in a solution containing EDTA. A microwave assisted acid digestion of the biodiesel samples was carried out before analysis. Experimental parameters such as deposition potential, deposition time, frequency, amplitude, step potential, were optimized for the purpose of determination of trace calcium ion in 1 × 104 μmol L−1 ammonium buffer solution (pH 9.4) in the presence of 400 μmol L−1 of EDTA. Under optimal conditions, the limit of detection was 1.6 × 10−3 μmol L−1 for Ca2+ with a 2 min preconcentration time. In addition, the EDTA/GCE displayed good reproducibility (CV maximum of 0.70%) and accuracy (recovery around 102%) making it suitable for the determination of Ca2+ in real biodiesel sample.
Keywords
Calcium , EDTA , Glassy carbon electrode , Square-wave anodic stripping voltammetry , biodiesel
Journal title
Fuel
Serial Year
2014
Journal title
Fuel
Record number
1471032
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