Author/Authors :
Tomar، Praveen Kumar نويسنده Department of Chemistry, Zakir Husain College (University of Delhi) J. L. Nehru Marg, New Delhi-110002, India , , Chandra، Sulekh نويسنده Department of Chemistry, Zakir Husain College,University of Delhi, J.L.N.Marg, New Delhi-110002, India , , Malik، Amrita نويسنده Department of Chemistry, Zakir Husain College (University of Delhi) J. L. Nehru Marg, New Delhi-110002, India , , Kumar، Adarsh نويسنده ,
Abstract :
An attempt has been made to develop a highly selective Cr3+-ion selective PVC
membrane electrode based on a 5% newly synthesized 3-aminoacetophenonethiosemicarbazone
as an ionophore with 62% DBP, 30% PVC and 3% NaTPB as an anion
excluder. The electrode exhibits a near Nernstian potential response of 19.7±0.2 mV per
decade over a wide concentration range (1.0×10-8 M to 1.0×10-1 M) with a detection limit of
7.4×10-8 between pH 1.5-6.8 with a fast response time (10 s). The selectivity coefficient
values were determined by matched potential method (MPM), indicate higher selectivity for
chromium(III) ion with improved performance as compared to other carriers reported earlier.
The proposed electrode exhibits an adequate shelf life (14 weeks) without any considerable
divergence in potentials. Further the electrode was also successfully applied to determine the
content of chromium in water samples collected from different sites of river Yamuna in Delhi.
