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. 2021 Sep 24;6(9):3284-3294.
doi: 10.1021/acssensors.1c01035. Epub 2021 Aug 20.

Amperometric Environmental Phosphate Sensors

Yuanyuan Lu  1 , Xiuting Li  2 , Danlei Li  1 , Richard G Compton  1
Affiliations

Amperometric Environmental Phosphate Sensors

Yuanyuan Lu et al. ACS Sens. .

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.

Keywords: chitosan; detection in fresh water; molybdate(VI) reduction; phosphate; square wave voltammetry.

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