University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Oil -> motor

Citations 1

"Determination Of Amalgam-forming Metals By Anodic-stripping Voltammetry In Solutions Containing Dissolved Oxygen"
Electroanalysis 1991 Volume 3, Issue 9 Pages 925-928
Miloslav Kopanica, Vera Stara

Abstract: Graphite powder (1 g) was mixed with silica gel (0.1 g) and the blend was further mixed with ceresin wax at 60°C. The warm mixture was pressed into a PTFE cylinder (5 cm x 0.2 mm) to form an electrode. Such electrodes (with Ag - AgCl reference and Pt counter electrodes) were used for linear scan or differential-pulse voltammetry. The solution for anlaysis were prepared to contain 0.1 M acetate buffer (pH 4.5) and 1 mM Hg(NO3)2 (to form the Hg film). After each use, the Hg film was removed mechanically or electrochemically. No O removal was necessary. Rectilinear calibration graphs were obtained for 5 to 150 µM of Cu(II), Pb(II) and Zn(II) with deposition at -1.2 V for 10 s (unstirred). For 10 to 500 nM solution of, e.g., Pb(II), the supporting electrolyte was 0.3 M HCl, the Hg2+ concentration. was 10 µM and deposition was for 3 min at -0.9 V, with stirring. The film was removed at +0.5 V. At 10 to 50 nM, the deposition was increased to 6 min. The method was applied in the determination of Pb in used motor oil (after extraction with 3 M HCl).
Metals Lead Electrode Voltammetry Sample preparation Buffer Extraction Heated reaction Silica gel