Abstract
A Cu 2+ ion-selective membrane microelectrode has been fabricated from poly vinyl chloride (PVC) matrix membrane containing a new symmetrical hexadentate Schiff's base 2-{1-(E)-2-((Z)-2-{(E)-2-[(Z)-1-(2-hydroxyphenyl)ethylidene] hydrazono}-1-methylpropylidene)hydrazono]ethyl}phenol (HDNOS) as a neutral carrier, Potassium tetrakis(4-chlorophenyl) borate (KTpClPB) as an anionic excluder and o-nitrophenyloctyl ether (NPOE) as a plasticizing solvent mediator. The microelectrode displays linear potential response in the concentration range of 1.0 x 10 -5 -1.0 x 10 -11 M of Cu 2+ . The microelectrode exhibits a nice Nemstian slope of 25.9 ± 0.3 mV decade -1 in the pH range of 3.1-8.1. The sensor has a relatively short response time in whole concentration ranges (∼5 s). The detection limit of proposed sensor is 5.0 × 10 ∼12 M (320 pg/L), and it can be used over a period of eight weeks. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of Cu 2+ with EDTA. The proposed membrane electrode was used for the direct determining of Cu 2+ content in black and red pepper, and in waste water samples.
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