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Performance studies of an IR fiber optic sensor for chlorinated hydrocarbons in water

  • Original Papers
  • Environmental Analysis, Other Matrices
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Abstract

Chlorinated hydrocarbons (CHCs) were monitored using a recently presented infrared fiber-optic physico-chemical sensor consisting of an MIR transparent, polymer coated, silver halide fiber coupled to a commercial FTIR spectrometer. The aim of this study was to test the performance of this new fiber optic sensing device with respect to temperature dependence, simultaneous detection of several CHCs, sensitivity and dynamic response behavior. In addition the diffusion process of the CHCs into the polymer was analyzed in order to better understand and evaluate the obtained results. During the investigation of the temperature dependence of the sensor response to real trend could be observed in the temperature range of 0 to 22°C. The dynamic response of the sensor is in the minute range when experiencing an increase in concentration of the analyte while with a decrease in concentration, the response is relatively slow. The sensor enabled the detection of 10 environmentally relevant CHCs at concentrations of 1 to 50ppm. The simulation of the experimental diffusion data revealed Fick's 1st law diffusion for CHCs into the polymer layers. Finally the sensing device was validated with head space-gas chromatography (HSGC) analyses and showed good agreement with these already established methods. This work shows the great potential of IR fiber optic sensors as early warning systems for a variety of CHCs in water (“threshold alarm sensor”)

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Authors and Affiliations

  1. Institute for Analytical Chemistry, Technical University Vienna, Getreidemarkt 9/151, A-1060, Vienna, Austria

    R. Göbel, R. Krska, S. Neal & R. Kellner

Authors
  1. R. Göbel
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  2. R. Krska
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  3. S. Neal
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  4. R. Kellner
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Dedicated to Professor Dr. Dieter Klockow on the occasion of his 60th birthday

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Göbel, R., Krska, R., Neal, S. et al. Performance studies of an IR fiber optic sensor for chlorinated hydrocarbons in water. Fresenius J Anal Chem 350, 514–519 (1994). https://doi.org/10.1007/BF00321798

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  • DOI: https://doi.org/10.1007/BF00321798

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