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Thiocyanate‐Selective Membrane Electrode Based on (Octabromotetraphenylporphyrinato)manganese(III) Chloride
Author(s) -
Shamsipur Mojtaba,
Khayatian Gholamreza,
Tangestaninejad Shahram
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199912)11:18<1340::aid-elan1340>3.0.co;2-m
Subject(s) - thiocyanate , potentiometric titration , chemistry , electrode , inorganic chemistry , detection limit , selectivity , membrane , ion selective electrode , chloride , manganese , electrode potential , electrochemistry , chromatography , organic chemistry , biochemistry , catalysis
The response characteristics of a new solvent‐polymeric membrane electrode with unique selectivity and detection limit toward SCN – ion are reported. The electrode is prepared by incorporating (octabromotetraphenylporphyrinato)manganese(III) chloride into a plasticized PVC‐membrane. The resulting sensor exhibits anti‐Hofmeister selectivity pattern with high specificity for thiocyanate over other anions, including lipophilic inorganic anions. The electrode has a linear dynamic range between 1.0 and 4.8×10 –7 M, with a Nernstian slope of 58.3±0.8 mV/decade and a detection limit of 3.2×10 –7 M. The electrode can be used for at least 3 months without any considerable divergence in potential. It was used as an indicator electrode in potentiometric titration of SCN – ion and in direct determination of thiocyanate in urine samples.