RT journal article
T1 Disposable optical sensor for Al(III) ions determination by coupled colorimetric solid-phase extraction-reflectance spectroscopy in leachates from cookware, antacids and hygienic care products
A1 Castañeda Loaiza, V.
A1 Díaz de Alba, Margarita Isabel
A1 Granado Castro, María Dolores
A1 Galindo Riaño, María Dolores
A1 Casanueva Marenco, María José
A2 Química Analítica
K1 aluminium
K1 leachates from cookware
K1 antacids
K1 optical sensor
K1 colorimetric solid-phase extraction
K1 diffuse reflectance spectroscopy
AB A disposable and miniaturised optical sensor based on colorimetric solid-phase extraction has been designed using poly(styrene-divinylbenzene) membrane disks modified with the colorimetric reagent pyridoxal salicyloylhydrazone to determine the aluminium concentration in aqueous solutions. The extraction of Al(III) ions by the reagent immobilised onto a disk allows the quantification directly on the adsorbent surface by a miniature portable reflectance spectrometer with an optical fibre at 434 nm. The optimisation of the sensing system was carried out by a fractional factorial design 33−1 considering the extraction pH, amount of ligandimmobilised onto the disk and time of immobilisation as experimental factors. The linear dynamic range of the sensor response ranged from 0.18 to 2 mg L−1 Al(III) with a detection limit of 0.18 mg L−1 (n=10), being the precision of 6.3% for 1 mg L−1 Al(III) (n=10, confidence level of 95%). The proposed method was successfully applied to the analysis of aluminium in leachates from cookware, antacids and hygienic care products, as contribution to the concern about aluminium as a known systemic toxicant at high doses.
PB Elsevier
SN 0039-9140
YR 2019
FD 2019
LK http://hdl.handle.net/10498/33269
UL http://hdl.handle.net/10498/33269
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026