Journal
ANALYTICAL LETTERS
Volume 52, Issue 7, Pages 1083-1096Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2018.1515953
Keywords
Boron-doped diamond electrode; cyclic voltammetry; differential pulse voltammetry; morpholine; square-wave voltammetry
Categories
Funding
- Coordenacao de Aperfeicoamento de Nivel Superior (CAPES) [3353/2014, 23038.007082/2014-03]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [481669/2013-2, 305552/2013-9, 307432/2017-3]
- Fundacao Araucaria do Parana [163/2014]
- SETI do Parana
- Instituto Nacional de Ciencia e Tecnologia de Bioanalitica (INCT) (FAPESP) [2014/50867-3]
- Instituto Nacional de Ciencia e Tecnologia de Bioanalitica (INCT) (CNPq) [465389/2014-7]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [14/50867-3] Funding Source: FAPESP
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available