Chromium(III)-selective sensor based on tri- o-thymotide in PVC matrix

Tri- o-thymotide (I) has been used as an electroactive material in PVC (poly(vinyl chloride)) matrix for fabrication of chromium(III)-selective sensor. The membrane containing tri- o-thymotide, sodium tetraphenyl borate (NaTPB), dibutyl phthalate (DBP) and PVC in the optimum ratio 5:1:75:100 (w/w) e...

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Bibliographic Details
Published in:	Sensors and actuators. B, Chemical Chemical, 2006-01, Vol.113 (1), p.182-186
Main Authors:	Gupta, V.K., Jain, A.K., Kumar, P., Agarwal, S., Maheshwari, G.
Format:	Article
Language:	eng
Subjects:	Cations Chemical sensors Chlorides Chromium sensors EDTA Electrodes Ion-selective electrodes Polyvinyl chlorides PVC Sensors Sodium Tetraphenyls
Online Access:	Get full text
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Summary:	Tri- o-thymotide (I) has been used as an electroactive material in PVC (poly(vinyl chloride)) matrix for fabrication of chromium(III)-selective sensor. The membrane containing tri- o-thymotide, sodium tetraphenyl borate (NaTPB), dibutyl phthalate (DBP) and PVC in the optimum ratio 5:1:75:100 (w/w) exhibits a working concentration range of 4.0 × 10 −6 to 1.0 × 10 −1 M with a Nernstian slope of 20.0 ± 0.1 mV/decade of activity in the pH range of 2.8–5.1. The detection limit of this sensor is 2.0 × 10 −7 M. The electrode exhibits a fast response time of 15 s, shows good selectivity towards Cr 3+ over a number of mono-, bi- and trivalent cations and can also be used in partially non-aqueous medium (up to 15%, v/v) also. The assembly has been successfully used as an indicator electrode in the potentiometric titration of chromium(III) against EDTA and also to determine Cr(III) quantitatively in electroplating industry waste samples.
ISSN:	0925-4005 1873-3077