Electroanalysis and Coulometric Analysis

Bard, Allen J.

doi:10.1021/ac60211a006

Cited by 9 publications

(2 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Traditionally, a measured volume of titrant required to achieve neutralization is used for volumetric analysis. If, on the other hand, the titrant can be delivered by electrochemical control, a direct detection in a chemical sensor format could be envisioned. , Coulometric and amperometric delivery of ions across ion-selective and/or permselective membrane electrodes have indeed been reported. − While such bulk sample titrations promise to be very accurate, they also necessitate the use of thin layer sampling compartments, fluidic systems or require precise aliquots and seem therefore less attractive for continuous measurements in unmodified samples in applications such as environmental monitoring. , …”

mentioning

confidence: 99%

Direct Detection of Acidity, Alkalinity, and pH with Membrane Electrodes

2012

View full text Add to dashboard Cite

An electrochemical sensing protocol based on supported liquid ion-selective membranes for the direct detection of total alkalinity of a sample that contains a weak base such as Tris (pK(a) = 8.2) is presented here for the first time. Alkalinity is determined by imposing a defined flux of hydrogen ions from the membrane to the sample with an applied current. The transition time at which the base species at the membrane-sample interface depletes owing to diffusion limitation is related to sample alkalinity in this chronopotentiometric detection mode. The same membrane is shown to detect pH (by zero current potentiometry) and acidity and alkalinity (by chronopotentiometry at different current polarity). This principle may become a welcome tool for the in situ determination of these characteristics in complex samples such as natural waters.

show abstract

mentioning

confidence: 99%

Direct Detection of Acidity, Alkalinity, and pH with Membrane Electrodes

2012

View full text Add to dashboard Cite

show abstract

“…The entire polarograph is usually constructed from operational amplifiers and these circuits are commonplace in electrochemical measurements. Detailed discussions of operational amplifier polarographs are to be found in the literature (15,25) and in a review of a special symposium on such instrumentation (37).2…”

Section: Electrodes With Forced Convectionmentioning

confidence: 99%