An efficient and selective flourescent chemical sensor based on 5-(8-hydroxy-2-quinolinylmethyl)-2,8-dithia-5-aza-2,6-pyridinophane as a new fluoroionophore for determination of iron(III) ions. A novel probe for iron speciation

Development of a novel fluorimetric bulk optode membrane based on meso-tetrakis(2-hydroxynaphthyl) porphyrin (MTHNP) for highly sensitive and selective monitoring of trace amounts of Hg2+ ions

“…Such behavior in porphyrin-based optical sensor has already been observed [20]. The use of 61-67% plasticizer in the prepared of the PVC-membranes resulted in optimum physical properties, as well as relatively high mobilities of their constituents [38,42].…”

“…It is well known that the response characteristics and working concentration range of optical membrane sensor greatly varies with the membrane composition [7,30,31,[34][35][36][37][38]. Nine different polymeric films with about the same plasticizer/PVC ratios (i.e., 2.0-2.3) but with varying nature and amount of other ingredients were tested to find an optimum composition (Table 1).…”

“…Nine different polymeric films with about the same plasticizer/PVC ratios (i.e., 2.0-2.3) but with varying nature and amount of other ingredients were tested to find an optimum composition (Table 1). It should be noted that the best PVCmembrane characteristics are reported to be usually obtained at a plasticizer/PVC ratio of 1.6-2.2 [30,[37][38][39].…”

“…In bulk liquid membrane optodes, a mass transfer of analyte from the sample solution into the membrane is required, in order to facilitate the establishment of a thermodynamic equilibrium between the membrane and the sample [7,30,[37][38][39]. Thus, for ion-selective fluorometric membrane based on electrically neutral fluoroionophore, the simultaneously presence of the lipophilic anionic sites (such as, sodium tetraphenylborate (NaTPB) or potassium tetra (4-chlorophenyl) borate (KTpClPB)) that give the membrane cation exchange properties is required.…”

Double-sided Microfluidic Device for Speciation Analysis of Iron in Water Samples: Towards Greener Analytical Chemistry

“…There are numerous analytical techniques used for iron speciation, such as ion chromatography, [4][5][6][7][8][9] flow-based analysis, [10][11][12][13][14][15] solvent extraction and flame atomic absorption spectrometry (AAS), 16 voltammetry, [17][18][19] and fluorescence spectrophotometry. 20 However, apart from some flow-based analysis systems, these techniques are infrequently used in field work due to the instrument size and a non-portable nature. Routine techniques for the analysis of iron in either water or waste water samples 18 include AAS and inductively coupled plasma (ICP) spectroscopy.…”