Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Electroanalytical Determination of Morpholine as a Corrosion Inhibitor at a Cathodically Pretreated Boron-Doped Diamond Electrode

Texto completo
Autor(es):
Rocha, Luana Rianne [1] ; D'Elia, Eliane [2] ; Medeiros, Roberta Antigo [1] ; Teixeira Tarley, Cesar Ricardo [1, 3]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Estadual Londrina, Ctr Ciencias Exatas, Dept Quim, Londrina, PR - Brazil
[2] Univ Fed Rio de Janeiro, Inst Quim, Rio De Janeiro - Brazil
[3] Univ Estadual Campinas UNICAMP, Inst Nacl Ciencia & Tecnol INCT Bioanalit, Inst Quim, Dept Quim Analit, Campinas, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Analytical Letters; v. 52, n. 7, p. 1083-1096, MAY 3 2019.
Citações Web of Science: 0
Resumo

An electroanalytical method for the determination of morpholine, a corrosion inhibitor, was developed at a cathodically pretreated boron-doped diamond electrode (BDDE). The voltammetric response of morpholine at the BDDE in 0.1 mol L-1 KCl (pH 10) shows an irreversible oxidation process at approximately 1.3 V vs. Ag/AgCl in 3.0 mol L-1 KCl. Using cyclic voltammetry, the number of electrons involved in the morpholine electroxidation mechanism was found to be 1. The application of chronoamperometry showed that the apparent diffusion coefficient (D-0) was 2.99 x 10(-6) cm(2) s(-1). Using square wave voltammetry under the optimized conditions (frequency of 30.0 Hz, pulse amplitude of 100 mV and step potential of 20 mV at pH 10.0), the developed method provided limits of detection and quantification of 2.1 and 6.9 mg L-1, respectively, with a linear range from 5.0 to 100.0 mg L-1 (r = 0.991). Intraday (n = 10) and interday (two consecutive day) precision values assessed as the relative standard deviation for solutions containing 30.0, 60.0, and 90.0 mg L-1 of morpholine were from 0.41 to 5.86% and 0.92 to 3.19%, respectively. The feasibility of the method for the interference-free determination of morpholine was verified by the analysis of synthetic boiler water samples containing CaCO3, Na2SO3, Na3PO4, FeCl3, and humic acid as organic matter. In addition, hydrazine was added as a possible interfering compound because of its widespread use in corrosion inhibition. Recovery values from 90.9 to 109.4% were obtained in the synthetic boiler water, thereby attesting to the accuracy of the method. (AU)

Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
Beneficiário:Lauro Tatsuo Kubota
Linha de fomento: Auxílio à Pesquisa - Temático