Sensory properties of phosphorus-containing oxide layers on titanium formed by plasma-electrolytic oxidation
Abstract
The composition, surface morphology, pH- and phosphate functions of phosphorus-containing oxide films on titanium formed by plasma-electrolytic oxidation in electrolytes containing from 0.05 to 0.2 mol/l of potassium dihydrophosphate have been studied. All the oxide layers incorporate titanium dioxide in the anatase crystal form and 7–8 at.% of phosphorus. The pH function of the formed films in the pH range from 2 to 7 and its amplification are revealed resulting from hydroxylation of the electrode surface in alkaline buffer solutions. The obtained oxide films on titanium exhibit a specific phosphate function and can be used as sensors in precipitation potentiometric titration, in particular, for water quality control of natural water bodies and waste water including determination of the content of phosphates and other acidic impurities.
References
Berchmans, S., Issa, T.B., & Singh, P. (2012). Determination of inorganic phosphate by electroanalytical methods: A review. Analytica Chimica Acta, 729, 7 - 20. https://doi.org/10.1016/j.aca.2012.03.060
Thomas, J.D.R. (1988). Uni-, Bi- and Tri-Enzyme Electrodes for Analysis. In: Guilbault G.G., Mascini M. (eds). Analytical uses of immobilized biological compounds for detection, medical and technical uses. NATO ASI Series (Series C: Mathematical and Physical Sciences), 226(1), 141 - 152. https://doi.org/10.1007/978-94-009-2895-4
Somer, G., Kalayci, S., & Basak, I. (2010). Preparation of a new solid state fluoride ion selective electrode and application. Talanta, 80(3), 1129 - 1132. https://doi.org/10.1016/j.talanta.2009.08.037
Davey, D.E., Mulcahy, D.E., & O’Connell, G.R. (1990). Flow-injection determination of phosphate with a cadmium ion-selective electrode. Talanta, 37(7), 683 - 687. https://doi.org/10.1016/0039-9140(90)80094-V
Hara, H., & Kusu, S. (1992). Continous-flow determination of phosphate using a lead ion-selective electrode. Anal. Chim. Acta. 261(1-2), 411 - 417. https://doi.org/10.1016/0003-2670(92)80221-R
Shirai, O., Xu, K., Kitazumi, Y., & Kano, K. (2018). Phosphate ion sensor using a cobalt phosphate coated cobalt electrode. Electrochimica Acta, 282, 242 - 246. https://doi.org/10.1016/j.electacta.2018.06.021
Fog, A., & Buck, R.P. (1984). Electronic semiconducting oxides as pH sensors. Sens. Actuators. 5(2), 137 - 146. https://doi.org/10.1016/0250-6874(84)80004-9
Gordienko, P.S. (1996). Formation of coatings on anodically polarized electrodes in aqueous electrolytes at the potentials of sparking and breakdown. Vladivostok: Dalnauka (in Russ.).
Burakhta, V.A. (2003). Electrochemical sensors based on semiconductor materials in the analysis of environmental objects. (Doctoral dissertation). Uralsk (in Russ.).
Kimstach, V.A. (1987). Metal electrodes with modified surface in sedimentary and complexometric titration (extended abstract of doctoral dissertation). Rostov-on-Don (in Russ.).
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