title: Fabrication, calibration and evaluation of a phosphate ion-selective microelectrode.
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 5-20μm and respond to all the three forms of phosphate ions, namely, H(2)PO(4)(-), HPO(4)(2-), and PO(4)(3-). The calibration curve at pH 7.5 had a slope of 31.5mV per decade change of concentration and a R(2) 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.
authors.affiliation: University of Cincinnati, 12716 Ginger Wood Lane, Clarksburg, MD 20871, USA. johnwang1974@gmail.com
authors.forename: John J
authors.initials: JJ
authors.lastname: Wang
authors.forename: Paul L
authors.initials: PL
authors.lastname: Bishop
mesh_terms: D002138:Calibration; D003035:Cobalt / Q000737:chemistry; D004787:Environmental Pollution; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000032:analysis*; D008839:Microelectrodes; D010710:Phosphates / Q000032:analysis* / Q000302:isolation & purification*; D010758:Phosphorus
chemical_list: D007477:Ions; D010710:Phosphates; D010758:Phosphorus; D003035:Cobalt