Premium
Electrochemical Selective Determination of Uranyl Ions Using PVC Membrane Sensor
Author(s) -
Akl Zeinab F.
Publication year - 2017
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/elan.201700007
Subject(s) - ionophore , uranyl , selectivity , electrochemistry , membrane , detection limit , analytical chemistry (journal) , chemistry , electrode , ion selective electrode , inorganic chemistry , ion , nuclear chemistry , chromatography , organic chemistry , biochemistry , catalysis
A UO 2 2+ ‐PVC membrane electrode was constructed using 2‐thenoyltrifluoroacetone as ionophore and its electrochemical response performance was characterized. The effect of membrane composition on the electrode performance was studied and best results were obtained using dioctylsebacate as a mediator and potassium tetrakis(4‐chlorophenyl)borate as anion excluder. The optimized UO 2 2+ ‐sensor exhibited a Nernstian response with a slope of 29.5±0.5 mV decade −1 over the concentration range 5.0×10 −7 −1.0×10 −1 mol L −1 at 25 °C with a detection limit of 3.1×10 −7 mol L −1 . The optimized electrode showed very good selectivity towards UO 2 2+ relative to a wide variety of other cations and fast response time. Surface morphology of the optimized membrane electrode at different stages of its development and use was investigated and discussed. Quantum chemical calculations for geometrical optimization of the ionophore were carried out to investigate the interaction between the ionophore and UO 2 2+ using DFT B3LYP/6‐31++G(d,p) level of theory and the obtained data confirmed the proposed response mechanism. The developed sensor was successfully applied for UO 2 2+ selective determination in real water samples and the obtained results were compared to those obtained by spectrophotometric method indicating no significant difference.