Determination of phosphate in water by flow coulometry
Slovak University of Technology, Faculty of Chemical and Food Technology Institute of Analytical Chemistry, Radlinského 9, 812 37 Bratislava, Slovakia
a Department of Chemistry, Faculty of Natural Sciences, University of SS. Cyril and Methodius in Trnava
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Abstract: In this work, the possibility of flow coulometry application as coulometric titration was studied. The method was used to analyze phosphates in wastewater samples. The principle of the determination consisted in the formation of molybdophosphate and its subsequent one-electron electrolytic reduction. The present method is applicable under optimal conditions in the concentration range of 1.5 × 10–6 to 5.5 × 10–5 mol/dm3. Detection limit of the method is 3.42 × 10–7 mol/dm3. Mineralization step has been proved a problem in total phosphate content determination. If mineralization was not carried out, only inorganic soluble phosphates were determined. It is a new method characterized by its simplicity of instrumentation and handling, which is a prerequisite for its further use in the field of trace analysis.
Keywords: coulometry, coulometric titration, phosphates, wastewater samples, porous electrode
Full paper in Portable Document Format: acs_0365.pdf
Acta Chimica Slovaca, Vol. 13, No. 1, 2020, pp. 102—107, DOI: 10.2478/acs-2020-0015