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.
Talanta
; 205: 120102, 2019 Dec 01.
Article
in En
| MEDLINE
| ID: mdl-31450421
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 434â¯nm. The optimisation of the sensing system was carried out by a fractional factorial design 33-1 considering the extraction pH, amount of ligand immobilised onto the disk and time of immobilisation as experimental factors. The linear dynamic range of the sensor response ranged from 0.18 to 2â¯mgâ¯L-1â¯Al(III) with a detection limit of 0.18â¯mgâ¯L-1 (nâ¯=â¯10), being the precision of 6.3% for 1â¯mgâ¯L-1â¯Al(III) (nâ¯=â¯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.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
Water Pollutants, Chemical
/
Aluminum
Language:
En
Year:
2019
Type:
Article