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Reference type: Journal
Authors: Cennamo N, De Maria L, D'Agostino G, Zeni L, Pesavento M
Article Title: Monitoring of Low Levels of Furfural in Power Transformer Oil with a Sensor System Based on a POF-MIP Platform.
Publication date: 2015
Journal: Sensors
Volume: 15
Issue: (4)
Page numbers: 8499-8511.
DOI: 10.3390/s150408499
Alternative URL: http://www.mdpi.com/1424-8220/15/4/8499

Abstract: In this work an innovative, miniaturized and low cost optical chemical sensor (POF-MIP platform), based on a molecular imprinted polymer (MIP) and surface plasmon resonance in a plastic optical fiber (POF), is presented and preliminarily tested for monitoring of furfural (furan-2-carbaldehyde) in transformer oil. To this end, the optical platform was coupled to an MIP layer, highly selective for furfural. The ability of the developed sensor to directly detect furfural in the insulating oil was investigated. The detection limit of the sensor has been found to be 9 ppb, with a linear response up to about 30 ppb. However there is a sensible response up to 0.15 ppm. Because of the small linearity range, the Hill equation is suggested for the quantification. The sensor has been effectively tested in real oil samples collected from aged electrical equipment removed from service. The assessed concentration of furfural is in good agreement with that evaluated by a high pressure liquid chromatography (HLPC) method, confirming the good selectivity of the proposed sensor.
Template and target information: furfural, furan-2-carbaldehyde
Author keywords: furfural (furan-2-carbaldehyde), power transformer, insulating oil system, molecularly imprinted polymer, Plastic optical fiber, surface plasmon resonance, Optical sensor


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