Fabrication, calibration and evaluation of a phosphate ion-selective microelectrode |
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| Authors: | John J. Wang Paul L. Bishop |
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| Affiliation: | a University of Cincinnati, 12716 Ginger Wood Lane, Clarksburg, MD 20871, USA
b Department of Civil and Environmental Engineering, PO Box 210071, University of Cincinnati, Cincinnati, OH 45221-0071, USA |
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| Abstract: | To conduct the micro-environment study of flocs in an enhanced biological phosphorus removal (EBPR) process, a phosphate ion-selective microelectrode was developed. The cobalt-based microelectrodes have tip diameters of 5-20 μm and respond to all the three forms of phosphate ions, namely, H2PO4−, HPO42−, and PO43−. The calibration curve at pH 7.5 had a slope of 31.5 mV per decade change of concentration and a R2 value of 0.99. Other characteristics of this microelectrode, such as response time, interferences from pH, ion strength, DO and other anions were also evaluated. |
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| Keywords: | Phosphate Ion-selective microelectrode Enhanced biological phosphorus removal (EBPR) Floc Micro-environment study |
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