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21 October 2004 CR (III) and CR (VI) detection in water environment using an optical fiber grating sensor
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Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.591584
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela
Abstract
This work shows the application of an optical sensor to detect the presence of Cr(III) and Cr(VI) oxidation states in water solutions. The sensing device is a long period grating produced in a standard telecommunication optical fiber by applying a suitable number of point-to-point electrical arc discharges from a fusion splicer. In order to analyze the Cr(III) and Cr(VI) solutions, the sensing device is kept into a recipient under constant longitudinal stress and the Chromium solution samples are added to it. The results show that the sensor can not only detect the presence, but also differentiate between the two-oxidation states. Samples with Chromium concentrations from 0.16 mg/l to 5.2 mg/l are analyzed, leading to maximum wavelength shifts (relative to the LPG in pure water) of 0.14 nm and 0.26 nm for Cr(III) and Cr(VI), respectively. A comparison between the results obtained for both solutions shows that is possible to identity any of the Chromium oxidation states present in the sample until a lower limit concentration of 2.6 mg/l for the employed set-up.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ricardo C. Kamikawachi, G. R.C. Possetti, Marcia Muller, Hypolito Jose Kalinowski, and Jose Luis Fabris "CR (III) and CR (VI) detection in water environment using an optical fiber grating sensor", Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004); https://doi.org/10.1117/12.591584
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