Analytical Sciences

Abstract − Analytical Sciences, 33(4), 511 (2017).

A Highly Structured 1,10-Phenanthroline Arrayed Hydrophobic Sulfone Membrane Platform for the Rapid Determination and Speciation of Fe2+/Fe3+ Ions in Water
Liyakat Hamid MUJAWAR,*1 Muhammad Imtiaz RASHID,*1,*2 Zulfiqar Ahmad REHAN,*3 Talal ALMEELBI,*1 Jalal Mohammad BASAHI,*1 and Mohammad Soror EL-SHAHAWI*4,*5
*1 Center of Excellence in Environmental Studies, King Abdulaziz University, P. O. Box 80200, Jeddah 21589, Saudi Arabia
*2 Department of Environmental Sciences, COMSATS Institute of Information Technology, 61100, Vehari, Pakistan
*3 Center of Excellence in Desalination Technology, King Abdulaziz University, P. O. Box 80200, Jeddah 21589, Saudi Arabia
*4 Department of Chemistry, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia
*5 On sabbatical leave from the Department of Chemistry, Faculty of Sciences, Damiatta University, Damiatta, Egypt
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.