A novel citrus pectin-modified carbon paste electrochemical sensor used for copper determination in biofuel

Author(s)

Alves, Gustavo Murilo ^[1] ; da Silva, Jose Luiz ^{[2, 1]} ; Stradiotto, Nelson Ramos ^{[2, 1]}

Affiliation

^[1] Sao Paulo State Univ Unesp, Dept Analyt Chem, Inst Chem, BR-14800060 Araraquara, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Bioenergy Res Inst, BR-14800060 Araraquara, SP - Brazil

• Document type: Journal article
• Source: MEASUREMENT; v. 169, FEB 2021.
• Web of Science Citations: 0

Abstract

This paper reports the construction of a citrus pectin-modified carbon paste electrode (PEC/CPE) which was applied for electrochemical sensitive detection of copper in biofuel. Considering its low cost of production and ease of handling, this novel sensor is a suitable alternative tool for ensuring the quality control of commercial bioethanol. Pectin carboxylic groups presence in the modified electrode helped increase its current response by 32% compared to the unmodified electrode. Under optimized conditions, using differential-pulse anodic stripping voltammetry, the analytical curve presented linear range from 5.0 x 10(-8) to 1.0 x 10(-4) mol L-1 (R = 0.999), with detection limit of 2.5 x 10(-8) mol L-1, quantification limit of 8.3 x 10(-8) mol L-1 and sensibility of 0.12 A mol(-1) L. The PEC/CPE was successfully applied for copper determination in bioethanol fuel sample where recoveries >99% were obtained. The sensor presented good selectivity, reproducibility and repeatability (RSD < 3.6%), with long-term stability over three months (RSD < 6.3%). (AU)

• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants