FAD: Techniques

Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

Electrode

Classification: Electrode -> ion selective -> microelectrode

Citations 2

'A Flow Injection System For Measurement Of Chemical Response Time Of Microelectrodes', Anal. Chim. Acta, 1982 144(1) 115-121

"A Flow Injection System For Measurement Of Chemical Response Time Of Microelectrodes"
Anal. Chim. Acta 1982 Volume 144, Issue 1 Pages 115-121

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A. Haemmerli and J. Janata, H. M. Brown

Abstract: A system for the measurement of the chemical response time (response to a rapid change in ionic activity) of ion-selective microelectrodes is described. The system is based on the flow injection technique. Results are presented for microchloride and potassium ion-selective field effect transistors. It is shown that these devices are sufficiently fast to study transient intracellular processes occurring on a time scale of a few seconds.

Potassium Chlorine Chemical response Review Theory

'Flow Injection Study Of The Potentiometric Lithium Selectivity Of Cyclic Dioxadiamides Containing Oxygen And Nitrogen Atoms', Fresenius J. Anal. Chem., 1987 329(1) 12-17

"Flow Injection Study Of The Potentiometric Lithium Selectivity Of Cyclic Dioxadiamides Containing Oxygen And Nitrogen Atoms"
Fresenius J. Anal. Chem. 1987 Volume 329, Issue 1 Pages 12-17

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A. S. Attiyat, Y. A. Ibrahim, A. M. Kadry, R. Y. Xie and G. D. Christian

Abstract: Four ionophores (neutral ion carriers) based on 1,5-dioxa-8,13-diazapentadecane were synthesized from NN'-diheptyl-5,5-dimethyl-3,7-dioxanonadiamide. Lithium ion-selective micro-electrodes were prepared by coating silver wire with a THF solution of PVC, plasticizer, K tetrakis-(4-chlorophenyl) borate and ionophore (1.5% w/w of solutes) and, in some instances, TOPO (1% w/w). They were tested in a flow injection system with a Ag - AgCl reference electrode and a carrier flow of 1 mL min-1. Calibration graphs were constructed for 0.2 to 200 mM Li in 140 mM NaCl solution and selectivity coefficient were determined with respect to Na, K, Ca and Mg. Two of the ionophores (those with fused side rings) had a selectivity equal to or better than that of 15-crown-4 ethers, and sensitivities in the rectilinear region of 46 and 51 mV per decade of Li concentration. The presence of TOPO had generally negative effects on sensitivity and variable effects on selectivity.

Lithium Interferences Selectivity Sensitivity