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PVC Based Monoaza‐18‐crown‐6 Membrane Potentiometric Sensors for Cadmium
Author(s) -
Gupta Vinod K.,
Kumar Pankaj,
Mangla Rajni
Publication year - 2000
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(200006)12:10<752::aid-elan752>3.0.co;2-v
Subject(s) - potentiometric titration , cadmium , chemistry , detection limit , membrane , sodium tetraphenylborate , potentiometric sensor , solvent , titration , vinyl chloride , inorganic chemistry , nuclear chemistry , chromatography , ion , polymer , organic chemistry , copolymer , biochemistry
Cadmium(II) ion selective sensors have been fabricated from poly(vinyl chloride) (PVC) matrix membranes containing neutral carrier, monoaza‐18‐crown‐6, sodium tetraphenyl borate (NaTPB) as an anion excluder and dibutylphthalate (DBP) and dioctylphthalate (DOP) as plasticizing solvent mediators. The membrane having the composition crown:NaTPB:PVC:DOP in the ratio 1:1:10:10 exhibits best results with linear potential response in the concentration range 1.0×10 –5 –1.0×10 –1 M with a detection limit of 1.12 mg/L and a Nernstian slope of 29.0 mV/decade between pH 5.0–7.7. The sensor exhibits a fast response time of<10 s, is inert towards acids, salt solutions and nonaqueous media (upto 35% (v/v)) and was used over a period of 3 months with good reproducibility. It is selective over a number of mono‐, bi‐, and trivalent cations. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of Cd 2+ with EDTA and also for the determination of Cd 2+ in waste water.