Combined Voltammetric Measurement of pH and Free Chlorine Speciation Using a Micro-Spot sp2 Bonded Carbon-Boron Doped Diamond Electrode

Analytical Chemistry
Anthony J Lucio, Julie V Macpherson

Abstract

This work demonstrates the use of an sp2-bonded carbon microspot boron doped diamond (BDD) electrode for voltammetric measurement of both pH and analyte concentration in a pH-dependent speciation process. In particular, the electrode was employed for the voltammetric detection of pH and hypochlorite (OCl-) in unbuffered, aerated solutions over the pH range 4-10. Knowledge of both pH and [OCl-] is essential for determination of free chlorine concentration. The whole surface of the microspot BDD electrode was found active toward the voltammetric oxidation of OCl-, with OCl- showing a characteristic response at +1.5 V vs SCE. In contrast, it was only the surface integrated quinones (Q) in sp2-bonded carbon regions of the BDD electrode that were responsible for the voltammetric pH signal. A Nernstian response for pH (gradient = 63 ± 1 mV pH-1) was determined from proton coupled electron transfer at the BDD-Q electrode, over the potential range -0.4-0.5 V vs SCE. By measuring both OCl- and pH voltammetrically, over the pH range 4-10, the OCl- oxidative current was found to correlate extremely well with the predicted pH-dependent [OCl-] speciation profile.

References

May 10, 2007·Nano Letters·Dan Wang, Liwei Chen
Oct 15, 2008·Journal of the American Chemical Society·Priscilla Kailian AngKian Ping Loh
Mar 29, 2014·The Analyst·Min Lu, Richard G Compton
Dec 19, 2014·Physical Chemistry Chemical Physics : PCCP·Julie V Macpherson
Nov 13, 2015·Analytical Chemistry·Flávia E GaldinoCraig E Banks

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