| Autor: |
Luiz Henrique de Oliveira, Ana Caroline Dias Souza, Lucas Pizzuti, Valdir Souza Ferreira, Lauro Antonio Pradela Filho, Regina Massako Takeuchi, André Luiz dos Santos, Magno A. G. Trindade |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Orbital: The Electronic Journal of Chemistry, Vol 6, Iss 4, Pp 255-266 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
1984-6428 |
| DOI: |
10.17807/orbital.v6i4.635 |
| Popis: |
In this work a carbon paste electrode chemically modified with an ionic liquid (CPE-IL) was used to quantify the antioxidant propyl gallate (PG) in spiked soybean biodiesel samples by square wave voltammetry. Under the optimized conditions, the proposed method have presented a linear range from 2.0 to 47.5 μmol L-1, with limit of detection equal to 0.397 μmol L-1. Recovery studies were performed in biodiesel samples spiked with two levels of PG. In all cases, satisfactory recovery percentages and low relative standard deviation values were obtained which is a clear demonstration of the accuracy of the proposed method. It was observed that IL provides a remarkable intensification of PG voltammetric response compared to a non-modified conventional CPE, improving, therefore, the detectability of the voltammetric method. The CPE-IL used in this work does not require an IL completely free from residual water. This is a very attractive feature because time-consuming procedures for water elimination are avoided during the synthesis of the IL. Thus, the proposed CPE-IL can be prepared in a simple, fast and inexpensive way making these electrodes very practical and competitive compared to other chemically modified electrodes proposed in the literature for PG quantification. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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