e-Article
Determination of Copper in Black, Red Pepper and the Waste Water Samples by a Highly Selective Sensitive Cu(II) Microelectrode Based on a New Hexadentates Schiff's Base
Document Type
Article
Source
Bulletin of the Korean Chemical Society, 27(9), pp.1439-1444 Sep, 2006
Subject
Language
ISSN
1229-5949
0253-2964
0253-2964
Abstract
A Cu2+ 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 10-5-1.0 10-11 M of Cu2+. The microelectrode exhibits a nice Nernstian 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 Cu2+ with EDTA. The proposed membrane electrode was used for the direct determining of Cu2+ content in black and red pepper, and in waste water samples.