Iron-selective Poly(Vinyl Chloride) Membrane Electrode Based on Norfloxacin as a Neutral Carrier

摘要

In the present study ion-selective PVC membrane sensor for iron ions based on (norfloxacin)1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylic acid (NOR) as adequate ionophorhas been prepared and studied. The electrode exhibit a good response for Fe3+ over a linear range from1.0×10?5 to 1.0×10?1 mol l?1 with a slope of 19.58±0.2 and 19.27±0.2 mV per decade and a detectionlimit of (5.0±1.0)×10?6 mol l?1 for o-nitrophenyl octyl ether (o-NPOE) and dioctylphthalate (DOP)plasticized based membrane sensors, respectively. The investigated membrane electrode revealedgood and fast response in a pH range of 3.0–8.0 for more than 4.0 months without any considerabledifference in potentials. The proposed sensor shows comparatively good selectivities with respect toalkali, alkaline earth and some transition and heavy metal ions. It was utilized as an indicator electrodein potentiometric determination of iron ions in some real samples.