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de Andrade CE, de Souza FC, Fernandes DR, Machado SAS, D'Elia E. Use of hg-electroplated-pt ultramicroelectrode for determining elemental sulphur in naphtha samples. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2012; 2012:265687. [PMID: 22567552 PMCID: PMC3335361 DOI: 10.1155/2012/265687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Revised: 01/30/2012] [Accepted: 01/31/2012] [Indexed: 05/31/2023]
Abstract
This paper describes the applicability of a Hg-electroplated-Pt ultramicroelectrode in the quantification of elemental sulphur in naphtha samples by square-wave voltammetry. A reproducible deposition methodology was studied and is reported in this paper. This methodology is innovative and relies on the quality of the mercury stock solution to obtain reproducible surfaces required for the analytical methodology. All analyses were performed using a Hg-electroplated-Pt ultramicroelectrode (Hg-Pt UME) due to the low sensibility of such devices to ohmic drops in resistive solutions. The responses of the peak areas in voltammetric experiments were linear in all of the range studied. The method developed here is accurate and reproducible, with a detection limit of 0.010 mg L(-1) and a good recovery range for both standard solutions of elemental sulphur (85 to 99%) and real naphtha sample (79%). These results attest to the potential for the application of this electroanalytical methodology in determining elemental sulphur in naphtha samples containing mercaptans and disulphides.
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Affiliation(s)
- Carlos Eduardo de Andrade
- Departamento de Química Inorgânica, Instituto de Química, Centro de Tecnologia, UFRJ, Avenida Athos da Silveira Ramos 149, Bloco A, Laboratório 634A, Cidade Universitária, 21941-909 Rio de Janeiro, RJ, Brazil
| | - Flávia C. de Souza
- Departamento de Química Inorgânica, Instituto de Química, Centro de Tecnologia, UFRJ, Avenida Athos da Silveira Ramos 149, Bloco A, Laboratório 634A, Cidade Universitária, 21941-909 Rio de Janeiro, RJ, Brazil
| | - Daniella R. Fernandes
- Departamento de Química Inorgânica, Instituto de Química, Centro de Tecnologia, UFRJ, Avenida Athos da Silveira Ramos 149, Bloco A, Laboratório 634A, Cidade Universitária, 21941-909 Rio de Janeiro, RJ, Brazil
| | - Sérgio A. S. Machado
- Instituto de Química de São Carlos, Universidade de São Paulo, Avenida do Trabalhador Saocarlense 400, 13566-590 São Carlos, SP, Brazil
| | - Eliane D'Elia
- Departamento de Química Inorgânica, Instituto de Química, Centro de Tecnologia, UFRJ, Avenida Athos da Silveira Ramos 149, Bloco A, Laboratório 634A, Cidade Universitária, 21941-909 Rio de Janeiro, RJ, Brazil
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Analysis of free glycerol in biodiesel using an electrochemical assay based on a two-enzyme platinum microelectrode system. J APPL ELECTROCHEM 2010. [DOI: 10.1007/s10800-010-0168-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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