An alternative method for the simultaneous determination of copper and lead for quality control of sugar cane spirit using a nanotube-based sensor

Journal of the Brazilian Chemical Society

Elisângela De F. L. Tavares²  Leonardo L. Okumura¹  Maria Das Graças Cardoso²  Marcelo F. De Oliveira¹  Zuy Maria Magriotis²  Adelir A. Saczk² 

[1] ,Universidade Federal de LavrasLavras MG ,Brazil

关键词: copper;    lead;    carbon paste electrode;    multi-walled carbon nanotubes;    ascorbic acid;    squarewave voltammetry;    sugar cane spirit;   

DOI  :  10.1590/S0103-50532012005000024

来源: SciELO

【 摘 要 】

The development of an electroanalytical method for simultaneous determination of copper and lead ions in sugar cane spirit (cachaça) using carbon paste electrode modified with ascorbic acid and carbon nanotubes (CPE-AaCNT) is described. Squarewave voltammetry (SWV) with anodic stripping was employed, and this technique was optimized with respect to the following parameters: frequency (50 Hz), amplitude (100 mV) and scan increment (9 mV). The analytical curves were linear in the range from 0.0900 to 7.00 mg L- 1 for lead and copper. The limits of detection were 48.5 and 23.9 µg L- 1 for lead and copper, respectively. The developed method was applied to the simultaneous determination of copper and lead in five commercial samples of sugar cane spirit. The results were in good agreement with those obtained by F AAS/GF AAS (flame atomic absorption spectrometry/graphite furnace atomic absorption spectrometry) and showed that CPE-AaCNT can be successfully employed in the simultaneous determination of these metals in real sugar cane spirit samples.

【 授权许可】

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