Novel Potentiometric Solid‐contact Electrode for the Determination of Fe²⁺ Ions via MWCNTs‐Gemifloxacin Composite

Abstract

A novel electrode was fabricated for the quantitation of Fe2+ ion. It was based on the covalent attachment of the gemifloxacin molecule (the recognition element) to the surface of MWCNTs to be incorporated as an electroactive material. Linear response of Fe2+ ions was found in the concentration range of 1×10−2 mol L−1 to 1×10−8 mol L−1 with a Nernstian slope of 30.37 ±0.3 (mV/decade) and attained a stable response within 5 s. The sensor exhibited LOD value of 4.8×10−9 mol L−1. It was applied in the monitoring of Fe2+ concentration in multi‐vitamins tablets, tap water and milk samples with acceptable recovery ranged from 94.00 % to 102.00 %.

Potentiometric Performance of Ion-Selective Electrodes Based on Polyaniline and Chelating Agents: Detection of Fe2+ or Fe3+ Ions

“…Dynamic light scattering (DLS) measurements were performed using the Zetasizer NanoZS instrument, model ZEN3600 (Malvern Instruments, Malvern, Worcestershire, UK). The size distribution of the polymeric assemblies in the polymer solutions (1.05 mg•mL −1 of POX 1.2 kDa, 1.75 mg•mL −1 of POX 2 kDa, and 4.1 mg•mL −1 of POX 4.7 kDa in deionized water) was carried at temperatures of 10,15,20,25,27,29,30,31,33,35,37, and 39 • C. The hydrodynamic radius (RH) was measured at a scattering angle of θ = 173 • , and the data were processed with the Repes algorithm. All POX solutions were filtered before measurement using a 0.45 µm PVDF syringe filter.…”

“…It was also reported that ISE was used for the determination of cations/anions and was also used for pharmaceutical compounds [ 23 , 24 , 25 , 26 ]. Currently, there have been only limited reports on the potentiometric detection of Fe 3+ ions in the literature [ 27 , 28 , 29 ]. Abdallah et al developed a new potentiometric sensor for the quantification of Fe 2+ ions via an MWCNTs-Gemifloxacin composite in the range of 10 −2 mol L −1 to 10 −8 mol L −1 with a Nernstian slope of 30.37 ± 0.3 (mV/decade).…”

Ion-Selective Electrodes with Solid Contact Based on Composite Materials: A Review

“…Studies on the construction of Fe 2+ -SCISEs using MWCNTs-gemifloxacin composite were described in publication [172]. The resulting sensor had a wide range of linearity (1 × 10 −2 -1 × 10 −8 M) with a slope of 30.37 ± 0.3 mVdec −1 and a fast response time (5 s).…”

Water monitoring with an automated smart sensor supported with solar power for real-time and long range detection of ferrous iron

“…For example, MWCNTs-gemifloxacin composite based ISE has been presented for detection of Fe 2+ ions in multivitamin tablets, tap water, and milk samples. 27 In another report, Mohamed et al reported an Fe 2+ -ISE based on a graphite–gold nanoparticles-polypyrrole nanocomposite and applied it in spiked water samples. 28 Recently, Ismail et al developed a polyaniline–graphite composite electrode modified with 2,2 bipyridyl and 1,10-phenanthroline-5-amine for Fe 2+ detection in serum samples.…”