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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 1
BKCSDE 29(1)
January 20, 2008 

 
Title
The Composition Dependence Selectivity Changes by Plasticizer at the Cation Sensors Based on Tetracycline Antibiotics
Author
Jonggyu Baek, Jin-San Kim, Insook Rhee Paeng, Ki-Jung Paeng*
Keywords
Cation selective electrodes, Tetracycline, Plasticizer, Membrane
Abstract
The performances of tetracycline based cation selective polymeric membrane electrodes of many sets with different plasticizers were investigated as the selectivity of ion-selective electrodes and optodes are greatly influenced by membrane solvent and also controlled by plasticizers. The membrane 1 with Bis(2-ethylhexyl) sebacate (DOS) and additive shows good potentiometric performance toward Ca2+ (slope: 27.8 mV per decade; DL: ?4.52) including selectivity. Contrastingly, membrane 4 with Dibutyl phthalate (DBP) shows near- Nernstian response, it has also shown the best measuring range and detection limit for Ca2+ (29.5 mV and ?5.10) and Mg2+ (24.4 mV and ?5.04) and the least selectivity has been also observed between Ca2+ and Mg2+. When the membrane 1 and 4 were used together to flow system, we could determine the concentration of Ca2+ and Mg2+, simultaneously.
Page
165 - 0
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