Determination of aluminium using different techniques based on the Al(III)-morin complex

Olga Domínguez-Renedo; A Marta Navarro-Cuñado; Eduardo Ventas-Romay; M Asunción Alonso-Lomillo

doi:10.1016/j.talanta.2018.12.048

Determination of aluminium using different techniques based on the Al(III)-morin complex

Talanta. 2019 May 1:196:131-136. doi: 10.1016/j.talanta.2018.12.048. Epub 2018 Dec 15.

Authors

Olga Domínguez-Renedo¹, A Marta Navarro-Cuñado², Eduardo Ventas-Romay³, M Asunción Alonso-Lomillo³

Affiliations

¹ Analytical Chemistry Department, Faculty of Sciences, University of Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain. Electronic address: olgado@ubu.es.
² Physical Chemistry Department, Faculty of Sciences, University of Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain.
³ Analytical Chemistry Department, Faculty of Sciences, University of Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain.

PMID: 30683342
DOI: 10.1016/j.talanta.2018.12.048

Abstract

Three different methods for the determination of Al(III) in aqueous samples were compared. The different described procedures were based on the formation of the Al(III)-morin complex. UV-Vis spectrophotometry, spectrofluorimetry and differential pulse adsorptive stripping voltammetry (DPAdSV) techniques were compared under optimized experimental conditions. The DPAdSV method showed a better performance for the analysis of Al(III) in terms of capability of detection (70 nM) in comparison with the value obtained for UV-Vis spectrophotometric (300 nM) and spectrofluorimetic (110 nM) techniques. Thus, DPAdSV method was selected for the analysis of aluminium in river, tap and bottled water samples under the following optimized experimental conditions: pH = 4.4, deposition potential = +243 mV, deposition time = 210 s, giving satisfactory results.

Keywords: Aluminium; Fluorescence; Morin; Stripping voltammetry; UV–Vis spectroscopy; Water samples.