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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4139
Title: Azide-selective sensor based on tripodal iron complex for direct azide determination in aqueous samples
Authors: Singh A.K.
Singh U.P.
Aggarwal V.
Mehtab S.
Published in: Analytical and Bioanalytical Chemistry
Abstract: A potentiometric azide-selective sensor based on the use of iron(III) hydrotris(3,5-dimethylpyrazolyl)borate acetylacetonate chloride [Tp Me2Fe(acac)Cl] as a neutral carrier for an azide-selective electrode is reported. Effect of various plasticizers, viz. o-nitrophenyloctyl ether (o-NPOE), dioctylphthalate (DOP), dibutylphthalate (DBP), and benzylacetate (BA), and an anion excluder, hexadecyltrimethylammonium bromide (HTAB), with [TpMe2Fe(acac)Cl] complex in poly(vinyl chloride) (PVC) were studied. The best performance was obtained with a membrane composition of [Tp Me2Fe(acac)Cl]/HTAB/DOP/PVC in a ratio of 5:2:190:100 (w/w). The sensor exhibits significantly enhanced selectivity toward azide ions over the concentration range 6.3∈×∈10-7 to 1.0∈×∈10-2 M with a lower detection limit of 3.8∈×∈10-7 M and a Nernstian slope of 59.4∈±∈1.1 mV decade-1. Influences of the membrane composition, pH and possible interfering anions were investigated on the response properties of the electrode. Fast and stable response, good reproducibility, long-term stability and applicability over a wide pH range (3.5-9.0) are demonstrated. The sensor has a response time of 14 s and can be used for at least 45 days without any considerable divergence in the potential response. The proposed electrode shows fairly good discrimination of azide from several inorganic and organic anions. It was successfully applied to the direct determination of azide in orange juice, tea extracts and human urine samples. © 2008 Springer-Verlag.
Citation: Analytical and Bioanalytical Chemistry (2008), 391(6): 2299-2308
URI: https://doi.org/10.1007/s00216-008-2129-2
http://repository.iitr.ac.in/handle/123456789/4139
Issue Date: 2008
Keywords: Azide sensor
Ion-selective electrode
Tripodal iron complexes
ISSN: 16182642
Author Scopus IDs: 57209223382
57203181883
16444161100
8954152100
Author Affiliations: Singh, A.K., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India
Singh, U.P., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India
Aggarwal, V., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India
Mehtab, S., Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India
Funding Details: Acknowledgement Mr. Vaibhave Aggarwal and Ms. Sameena Mehtab are greatful to the Council of Scientific and Industrial Research, New Delhi, India, for providing financial assistance for this work.
Corresponding Author: Singh, A. K.; Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India; email: akscyfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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