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Atropine-selective membrane electrodes and relative selectivity concept
Faculty
Science
Year:
2008
Type of Publication:
Article
Pages:
889-894
Authors:
Zareh, Mohsen M
DOI:
10.2116/analsci.24.889
Journal:
ANALYTICAL SCIENCES JAPAN SOC ANALYTICAL CHEMISTRY
Volume:
24
Research Area:
Chemistry
ISSN
ISI:000257789800013
Keywords :
Atropine-selective membrane electrodes , relative selectivity concept
Abstract:
TFPB was introduced as a charged ionophore for atropine selective electrodes. Typical Nernstian responses were found (57.78, 58.95 and 58.41 mV/decade) for PVC-membrane electrodes incorporating NPOE, DOS, and DDP as plasticizers. They exhibited practical linear ranges of 9.1 x 10(-3) - 10(-6), 9.1 x 10(-3) - 10(-6) and 9.1 x 10(-3) - 10(-7) M, respectively. It works in the sub-micro scale of atropine concentrations. The optimum pH-range was 3.18 - 8.97. The selectivity coefficient values were estimated for different organic and inorganic cations. They were interpreted by using the ``Relative Selectivity Concept{''}, which was introduced for the first time. The new concept was applied for comparing the selectivity properties of previously reported electrodes. The effect of the presence of ephedrine, caffeine, glucose, Na+, Ca2+, and Mg2+ on the calibration graphs of the electrodes was studied.
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