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    In Situ Trace Analysis of Oil in Water with Mid-Infrared Fiberoptic Chemical Sensors

    Year: 2012

    Journal: Analytical Chemistry, 2012, 84 (3), 1274-1280, 20131009

    Authors: Yuliya Luzinova, Bodgan Zdyrko, Igor Luzinov, Boris Mizaikoff

    Organizations: Georgia Institute of Technology, School of Chemistry and Biochemistry, Atlanta, GA, 30332, USA; Clemson University, School of Material Science and Engineering, Clemson, SC, 29634, USA; University of Ulm, Institute of Analytical and Bioanalytical Chemistry, 89081 Ulm, Germany

    The determination of trace amounts of oil in water facilitates the forensic analysis on the presence and origin of oil in the aqueous environment. To this end, the present study focuses on direct sensing schemes for quantifying trace amounts of oil in water using mid-infrared (MIR) evanescent field absorption spectroscopy via fiberoptic chemical sensors. MIR transparent silver halide fibers were utilized as optical transducer for interrogating oil-in-water emulsions via the evanescent field emanating from the waveguide surface, and penetrating the surrounding aqueous environment by a couple of micrometers. Unmodified fibers and fibers surface-modified with grafted epoxidized polybutadiene layers enabled the direct detection of crude oil in a deionized water matrix at the ppm level to ppb concentration level, respectively. Thus, direct chemical sensing of crude oil IR signatures without any sample preparation as low as 46 ppb was achieved with a response time of a few seconds.