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Reference type: Journal
Authors: Warwick C, Guerreiro A, Gomez-Caballero A, Wood E, Kitson J, Robinson J, Soares A
Article Title: Conductance based sensing and analysis of soluble phosphates in wastewater.
Publication date: 2014
Journal: Biosensors and Bioelectronics
Volume: 52
Page numbers: 173-179.
DOI: 10.1016/j.bios.2013.08.048
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0956566313005976

Abstract: The current standard method used for measuring soluble phosphate in environmental water samples is based on a colourimetric approach, developed in the early 1960s. In order to provide an alternative, label free sensing solution, a molecularly imprinted polymer (MIP) was designed to function as a phosphate receptor. A combination of functional monomer (N-allylthiourea), cross-linker and monomer/template ratios were optimised in order to maximise the binding capacity for phosphate. When produced in membrane format, the MIP's ability to produce a reversible change in conductance in the presence of phosphate was explored for fabrication of a sensor which was able to selectively detect the presence of phosphate compared to sulphate, nitrate and chloride. In wastewater samples the sensor had a limit of detection of 0.16 mg P/l, and a linear range between 0.66 and 8 mg P/l. This is below the minimum monitoring level (1 mg P/l) as required by current legislation for wastewater discharges, making the sensor as developed promising for direct quantification of phosphate in environmental monitoring applications
Template and target information: phosphate ion
Author keywords: phosphate, sensor, MIP, Thiourea, Conductance, Wastewater


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