Interface of Two Immiscible Electrolytes as a Potentiometric Sensor for Flow Analysis

0451446 - ÚFCH JH 2017 RIV US eng J - Článek v odborném periodiku
Mansfeldová, Věra - Janda, Pavel - Tarábková, Hana - Kaleta, Jiří
Interface of Two Immiscible Electrolytes as a Potentiometric Sensor for Flow Analysis.
Analytical Letters. Roč. 49, č. 1 (2016), s. 169-177. ISSN 0003-2719. E-ISSN 1532-236X
Grant CEP: GA ČR(CZ) GAP208/12/2429
Institucionální podpora: RVO:61388955 ; RVO:61388963
Klíčová slova: flow analysis * phthalocyanine * potentiometry
Kód oboru RIV: CG - Elektrochemie
Impakt faktor: 1.150, rok: 2016

An interface of two immiscible electrolyte solutions (dual ITIES) was investigated for application as a biomimetic sensor for potentiometric flow analysis. The dual ITIES was formed by a water/ortho-dichlorobenzene/water interface in free-standing and nanoporous membrane-supported arrangements. One aqueous phase served as the mobile and second aqueous phase as the stationary phase. The nonaqueous (ortho-dichlorbenzene) phase contained dissolved phthalocyanine as a redox mediator, whereas tetrabutylammonium perchlorate acted as a phase transfer agent. The sensing mechanism utilized ambient oxygen for regeneration of the redox mediator; the sensor thus operates under air conditions where oxygen serves to partially establish the equilibrium interface potential. The free-standing and nanoporous membrane-supported arrangements provided fast and reproducible response for flow analysis with sulfide serving as a model analyte. Good stability, fast recovery, and high resistance to saturation were found. The signal-to-noise ratio was discussed with respect to electrolyte concentration and gaseous bubbles trapped on the membrane.
Trvalý link: http://hdl.handle.net/11104/0252596