Electroanalysis · 2006 · 70 citations · 26 references
EngineeringChemical EngineeringMaterials ScienceElectroanalytical MethodsElectrochemical EngineeringElectrochemistryArtificial MembranesMembrane CharacterizationMembrane EngineeringMembrane MaterialsMembrane SelectivityPolymeric MembranesInorganic-organic Hybrid MembranesMembrane ElectrodesMethod Detection LimitNernstian ResponsePh DependencePlasticized Polyvinyl Chloride MembranesResponse TimeSelectivity
Abstract A poly(vinyl chloride)‐based membrane of dimethyl 1‐acetyl‐8‐oxo‐2,8‐dihydro‐1 H ‐pyra‐zolo[5,1‐a]isoindole‐2,3‐dicarboxylate as a neutral carrier with sodium tetraphenylborate (NaTPB) as an anion excluder and 2‐nitrophenyl octyl ether (NPOE) as plasticizer was prepared and investigated as a Ba(II)‐selective electrode. The electrode exhibits a Nernstian slope of 29.7±0.4 mV per decade over a wide concentration range (1.0×10 −6 to 1.0×10 −1 M) with a detection limit of 7.6×10 −7 M between pH 3.0 and 11.0. The response time of the sensor is about 10 s and it can be used over a period of 2 months without any divergence in potential. The proposed membrane sensor revealed good selectivity for Ba(II) over a wide variety of other metal ions. It was successfully used in direct determination of barium ions in industrial wastewater samples.
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