title: Effect of bevelling on C1-selective microelectrodes: experimental and model study.
abstract: Bevelling of the ultra-fine tips of C1-selective microelectrodes (ME) based on liquid ion-exchanger Corning 477913 caused significant decrease in ME resistivity, increase in sensitivity dependent on its initial value and decrease in selectivity constant for bicarbonates (KC1,HCO3) from 10:1 to approximately 8:1. Bevelling did not affect KC1,NO3 which had value below 1 due to higher selectivity of the ion-exchanger for nitrates. The observed experimental alterations in ME behavior after bevelling were in agreement with those predicted by a relatively simple electrical model comprising of two conductive pathways in parallel having opposite in sign sensitivities.
authors.affiliation: Department of Physiology, Medical Academy, Sofia.
authors.forename: O C
authors.initials: OC
authors.lastname: Ikonomov
authors.forename: N C
authors.initials: NC
authors.lastname: Vrabchev
authors.forename: A G
authors.initials: AG
authors.lastname: Stoynev
mesh_terms: D002712:Chlorides / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008839:Microelectrodes; D008954:Models, Biological
chemical_list: D002712:Chlorides