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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 9
BKCSDE 27(9)
September 20, 2006

Title	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
Author	Parviz Norouzi*, Mohammad Reza Ganjali, Farnoush Faridbod, Masoud Salavati-Niasari
Keywords	Copper, Ion-selective microelectrode, PVC membrane, 2-{1-(E)-2-((Z)-2-{(E)-2-[(Z)-1-(2-Hydroxyphenyl)ethylidene]hydrazono}-1-methyl propylidene)hydra zono]ethyl}phenol (HDNOS)
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.
Page	1439 - 1444
Full Text	PDF

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