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Membrane Composition Effects on the Analytical Behavior of Solid Contact Potentiometric Pb 2+ Selective Electrodes Based on Diazadibenzo‐18‐crown‐6 Ionophores
Author(s) -
Ochoa G. Cuervo,
AguilarCordero J. C.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100073
Subject(s) - potentiometric titration , dielectric spectroscopy , electrode , membrane , analytical chemistry (journal) , chemistry , electrochemistry , detection limit , substrate (aquarium) , 18 crown 6 , potentiometric sensor , ion , nuclear chemistry , inorganic chemistry , chromatography , organic chemistry , biochemistry , oceanography , geology
Abstract The effect of component contents and membrane thickness on the detection limit ( DL ), slope ( m ), linear range ( LR ) and response time ( RT ) of Pb 2+ solid contact potentiometric ion selective electrodes (SCISE) based on 4,10‐diaza‐2,3,11,12‐dibenzo‐18‐crown‐6 (1), 4,10‐diaza‐2,3,11,12‐di(4‐ tert ‐butylbenzo)‐18‐crown‐6 (2) and 4,10‐diaza‐2,3,11,12‐dibenzo‐18‐crown‐6‐ N , N ′‐di(carboxymethyl) (3) as ionophores was studied by open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements. The use of an intermediate layer of poly(3‐octyl)thiophene between the gold substrate and the selective membrane was explored. SCISE prepared showing the best responses had typical DL , m , LR and RT values of 10 −6 M, 29 mV/dec, 10 −5 to 10 −3 M and 2 minutes.