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oai:figshare.com:article/33814810 2026-09-15T18:02:05Z portal_1197 item_type_3 month_year_09_2026

Data for Combined voltammetric measurement of pH and free chlorine speciation using a micro-spot sp2 bonded carbon - boron doped diamond electrode Anthony J. Lucio (3121167) Julie V. Macpherson (1517371) Electrodes, Carbon Doped semiconductors Electrochemical analysis Boron Diamonds Migrated from ePrints This work demonstrates the use of an sp2-bonded carbon micro-spot boron doped diamond (BDD) electrode for voltammetric measurement of both pH and species concentration in a pH-dependant speciation process. In particular, the electrode was employed for the voltammetric detection of both 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 micro-spot BDD electrode was found active towards 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.<br><br>Data record consists of a zip archive containing the raw data, organised into subfolders according to data type, and an accompanying readme file. Further information on specific data files can be found in the accompanying readme file. 2026-09-15T18:02:05Z Dataset Dataset 10.82444/warw.33814810.v1 https://figshare.com/articles/dataset/Data_for_Combined_voltammetric_measurement_of_pH_and_free_chlorine_speciation_using_a_micro-spot_sp2_bonded_carbon_-_boron_doped_diamond_electrode/33814810 CC BY 4.0