title: Magnesium optical one-shot sensor based on a coumarin chromoionophore.
abstract: The characterization of a new irreversible optical absorption-based one-shot sensor for magnesium is described. The magnesium photoactive probe is 7-diethylamino-3-(3,4-ethylendioxybenzoyl)coumarin immobilized in a plasticized polymeric membrane. The magnesium selectivity can be explained in terms of size and charge density of magnesium and charge-separated resonance forms contribution in the excited state of coumarin. The selectivity obtained for magnesium over a variety of naturally occurring species in natural waters meets the requirements for the determination of this ion in water. The one-shot sensor responds between 0.14 and 14mgL(-1) with a sensor-to-sensor reproducibility of 1.3% as [Formula: see text] , at the medium level of the range. The performance of the optical one-shot sensor was tested in the analysis of magnesium in different types of natural waters and soft drinks validating results against a reference procedure.
authors.affiliation: Department of Analytical Chemistry, University of Granada, Granada 18071, Spain.
authors.forename: L F
authors.initials: LF
authors.lastname: Capitán-Vallvey
authors.forename: M D
authors.initials: MD
authors.lastname: Fernández-Ramos
authors.forename: A
authors.initials: A
authors.lastname: Lapresta-Fernández
authors.forename: E
authors.initials: E
authors.lastname: Brunet
authors.forename: J C
authors.initials: JC
authors.lastname: Rodríguez-Ubis
authors.forename: O
authors.initials: O
authors.lastname: Juanes