Potentiometric Studies of a New Solid-state Contact Iron(III)- Selective Electrode Based on Morin-Fe2+ Shiff Base Complex.

摘要

In this study, we focused on developing a new miniaturized solid-state contact PVC based iron(III)-selective electrode using morin-Fe2+ shiff-base complex as the sensing material for environmentalmonitoring of iron(III) ions. The membrane composition of the electrode was optimized and thepotentiometric performance characteristics of the electrode including selectivity, detection limit, pHrange, response time, concentration range and potential stability were investigated. The resultsindicated that the electrode showed super Nernstian response of 56.14 ± 0.22 mV/decade over the widelinear concentration range 1.0×10?6 to 1.0×10?1 M, and a very low detection limit of 4.5×10-7 M. Thepotentiometric response of the fabricated electrode was independent at pH 5-10 and the electrodeshowed a very short response time (<10 s). It exhibited excellent selectivity towards iron(III) ion overvarious cations including iron(II) ions. The proposed electrode was successfully applied for rapidinexpensive in-situ analysis of iron(III) ion in acid mine drainage and soil samples with comparison toinductively coupled plasma optical emission spectrometry (ICP-OES) analysis method, and the resultsobtained were agreeable with each other.