Ion-selective electrode for aluminum determination in pharmaceutical substances, tea leaves and water samples

A novel ion-selective PVC membrane sensor for Al(III) ions based on 6-(4-nitrophenyl)-2-phenyl-4-(thiophen-2-yl)-3,5-diaza-bicyclo[3.1.0]hex-2-ene (NTDH) as a new ionophore has been prepared and studied. The electrode exhibit a good response for aluminum ion over concentration range of 1.0 × 10 −6 t...

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Bibliographic Details
Published in:	Talanta (Oxford) Vol. 75; no. 4; pp. 1046 - 1054
Main Authors:	Arvand, M., Asadollahzadeh, S.A.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 30-05-2008 Oxford Elsevier
Subjects:	Aluminum - analysis Aluminum - chemistry Analytical chemistry Bridged Bicyclo Compounds, Heterocyclic - chemistry Calibration Chemistry Electrochemical methods Exact sciences and technology General, instrumentation Hydrogen-Ion Concentration Ion-Selective Electrodes Isothermal temperature coefficient Membranes, Artificial Non-aqueous media Pharmaceutical Preparations - chemistry Plant Leaves - chemistry Poly(vinyl chloride) membrane Potentiometric Al(III) sensor Potentiometry Sandwich method Tea - chemistry Temperature Thiophenes - chemistry Time Factors Water - chemistry Poly(vinyl chloride) membrane Potentiometric Al(III) sensor Non-aqueous media Sandwich method Isothermal temperature coefficient Water Performance evaluation Stoichiometry Selectivity Oleic acid Detection limit Acetophenone Membrane Ionophore Polyvinyl chloride Electrode potential Membrane electrode Chemical sensor Potentiometry Electrochemical detector Ion selective electrode Response time Cations Aluminium III Aqueous solution Non aqueous solvent
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Summary:	A novel ion-selective PVC membrane sensor for Al(III) ions based on 6-(4-nitrophenyl)-2-phenyl-4-(thiophen-2-yl)-3,5-diaza-bicyclo[3.1.0]hex-2-ene (NTDH) as a new ionophore has been prepared and studied. The electrode exhibit a good response for aluminum ion over concentration range of 1.0 × 10 −6 to 1.0 × 10 −1 mol L −1 with a Nernstian slope of 19.6 ± 0.4 mV per decade and low detection limit of 6.3 × 10 −7 mol L −1. The best performance was obtained with membrane composition 30% poly(vinyl chloride), 62% acetophenone, 5% oleic acid, 3% ionophore and 2 ml tetrahydrofuran. NTDH-based electrode was suitable for aqueous solutions of pH 3. It has relatively fast response time (∼10 s) and can be used at least for 3 months without any considerable divergence in potentials. The proposed membrane electrode revealed good selectivity for Al(III) ions over a wide variety of other cations. The standard electrode potentials were determined at different temperatures and used to calculate the isothermal coefficient of the electrode. The formation constant and stoichiometry ratio of ionophore–Al(III) complex were calculated at 25 °C by using segmented sandwich membrane method. It was used in non-aqueous solvents and also as indicator electrode in potentiometric determination of Al(III) ions in some real samples.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0039-9140 1873-3573
DOI:	10.1016/j.talanta.2008.01.001