title: A Highly Structured 1,10-Phenanthroline Arrayed Hydrophobic Sulfone Membrane Platform for the Rapid Determination and Speciation of Fe2+/Fe3+Ions in Water.
abstract: An optical assay for the rapid determination and chemical speciation of Fe2+/Fe3+species has been proposed for the first time on a polyether sulfone (PES) membrane platform. The small pore size and low wettability (θ ∼82°) of the membrane disallowed the dissipation of analyte droplets on the surface, thus localizing it onto nanoliter arrayed 1,10-phenanthroline spots. Under optimized conditions and within ∼5 min, an acceptable limit of detection (0.1 μg mL-1) and linear dynamic range (1 - 100 μg mL-1) were achieved. The proposed method was also successfully applied for indirect determination of Fe3+ions in synthetic samples after reduction to Fe2+using SO2. The performance of the proposed sensor was validated for its robustness and stability. Due to high selectivity and accuracy, the method was satisfactorily applied for the analysis of Fe2+/Fe3+species in marine water samples. The proposed method is an easy and low-cost system coupled with good reproducibility and ruggedness, applicable for point-of-use testing.
authors.affiliation: Center of Excellence in Environmental Studies, King Abdulaziz University.
authors.forename: Liyakat Hamid
authors.initials: LH
authors.lastname: Mujawar
authors.forename: Muhammad Imtiaz
authors.initials: MI
authors.lastname: Rashid
authors.forename: Zulfiqar Ahmad
authors.initials: ZA
authors.lastname: Rehan
authors.forename: Talal
authors.initials: T
authors.lastname: Almeelbi
authors.forename: Jalal Mohammad
authors.initials: JM
authors.lastname: Basahi
authors.forename: Mohammad Soror
authors.initials: MS
authors.lastname: El-Shahawi