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A New Zn 2+ ‐Selective Sensor Based on 5,10,15,20‐Tetraphenyl‐21 H ,23 H ‐porphine in PVC Matrix
Author(s) -
Gupta V. K.,
Jain A. K.,
Mangla Rajni,
Kumar Pankaj
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200108)13:12<1036::aid-elan1036>3.0.co;2-7
Subject(s) - potentiometric titration , chemistry , alcohol , acetone , inorganic chemistry , titration , selectivity , solvent , matrix (chemical analysis) , electrode , chromatography , organic chemistry , catalysis
PVC based membrane incorporating 5,10,15,20‐tetraphenyl‐21 H ,23 H ‐porphine ( I ) as an electroactive material, sodium tetraphenyl borate (NaTPB) as an additive and tri‐ n ‐butyl phosphate (TBP) as solvent mediator, in the ratio 200:5:2:150; (w/w) (PVC: I :NaTPB:TBP) has been used as a Zn 2+ ‐selective sensor. The sensor works in a wide concentration range (6.2×10 −6 –1.0×10 −1 M) with Nernstian slope (29.0±1.0 mV/decade of activity) and a response time as fast as 12 s. The working pH range of the sensor is 3.8–7.7 and it can tolerate a nonaqueous content up to 25% (v/v) (acetone, methyl alcohol and ethyl alcohol). The life time of this sensor is more than six months. It exhibits moderate selectivity over a number of cations and has been used as an indicator electrode in the potentiometric titration of Zn 2+ against EDTA solution.