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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4146
Title: Thiocyanate selective sensor based on tripodal zinc complex for direct determination of thiocyanate in biological samples
Authors: Singh A.K.
Singh U.P.
Mehtab S.
Aggarwal V.
Published in: Sensors and Actuators, B: Chemical
Abstract: A potentiometric thiocyanate-selective sensor based on the use of zinc-tris(N-tert-butyl-2-thioimidazolyl)hydroborate complex [Ttt-Bu-Zn] as a neutral carrier for a thiocyanate-selective electrode is reported. Effect of various plasticizers viz., o-nitrophenyloctyl ether (o-NPOE), dioctylphthalate (DOP), dibutylphthalate (DBP), benzylacetate (BA), and anion excluder, hexadecyltrimethylammonium bromide (HTAB), with Ttt-Bu-Zn complex in poly (vinyl chloride) (PVC) were studied. The best performance was obtained with a membrane composition of DOP:PVC:Ttt-Bu-Zn:HTAB percent ratio (w/w) of 60:33:5:2. The sensor exhibits significantly enhanced selectivity toward thiocyanate ions over the concentration range 6.3 × 10-7 to 1.0 × 10-2 M with a lower detection limit of 3.16 × 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, 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 their potential response. The proposed electrode shows fairly good discrimination of thiocyanate from several inorganic and organic anions. It was successfully applied to direct determination of thiocyanate within physiological fluids and environmental samples. © 2007 Elsevier B.V. All rights reserved.
Citation: Sensors and Actuators, B: Chemical (2007), 125(2): 453-461
URI: https://doi.org/10.1016/j.snb.2007.02.056
http://repository.iitr.ac.in/handle/123456789/4146
Issue Date: 2007
Keywords: Ion-selective electrode
Neutral carrier
Thiocyanate
Tripodal zinc complexes
ISSN: 9254005
Author Scopus IDs: 57209223382
57203181883
8954152100
16444161100
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
Mehtab, S., 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
Funding Details: Ms. Sameena Mehtab is greatful to Council of Scientific and Industrial Research, New Delhi, India for providing financial assistance for this work. Ashok Kumar Singh is a professor of organic chemistry at Indian Institute of Technology Roorkee, Roorkee, India. He received his PhD in Organic Chemistry from Banaras Hindu University, Varanasi, India in 1977. His research work has been mainly focused on the synthesis of macrocyclic ligand-complexes and their applications in analytical chemistry as chemical sensors. Udai Pratap Singh is an associate professor of inorganic chemistry at Indian Institute of Technology Roorkee, Roorkee, India. He received his PhD in Inrganic Chemistry from Banaras Hindu University, Varanasi, India. His research work has been mainly focused on the synthesis of Coordination Chemistry, Bio-inorganic Chemistry, Enantioselective Catalysis and Heme-Protein. Sameena Mehtab obtained her MSc degree in Chemistry from Indian Institute of Technology, Roorkee, Roorkee in 2004. She is currently working towards her PhD at the Indian Institute of Technology Roorkee, Roorkee, India under the supervision of Prof. Ashok Kumar Singh. Vaibhave Aggarwal obtained his MSc degree in Chemistry from Indian Institute of Technology, Roorkee, Roorkee in 2004. He is currently working towards his PhD at the Indian Institute of Technology Roorkee, Roorkee, India under the supervision of Prof. Udai Pratap Singh.
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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