Amperometric Environmental Phosphate Sensors
Yuanyuan Lu, Xiuting Li, Danlei Li, Richard G. Compton
Abstract
We report a novel amperometric sensor for aqueous phosphate ions in freshwater systems based on the reductive square wave voltammetry of molybdate(VI) anions immobilized within a chitosan matrix deposited on a glassy carbon electrode. A sensitivity of 4.4 ± 0.1 μA/μM was realized together with a LOD of 0.15 μM. The sensor was insensitive to chloride and nitrate ions below a threshold concentration of 1.0 mM. Analytical measurements were successfully made in authentic samples of tap and pond water.
Topics & Concepts
AmperometryTap waterNitratePhosphateMolybdateAqueous solutionChlorideChemistryInorganic chemistryMatrix (chemical analysis)ElectrochemistryElectrodeAnalytical Chemistry (journal)Environmental chemistryChromatographyEnvironmental engineeringEnvironmental scienceOrganic chemistryPhysical chemistryAnalytical Chemistry and SensorsElectrochemical Analysis and ApplicationsConducting polymers and applications