BOKU - Universität für Bodenkultur Wien - Forschungsinformationssystem

Logo BOKU-Forschungsportal

Gewählte Publikation:

Steiner, H; Jakusch, M; Kraft, M; Karlowatz, M; Baumann, T; Niessner, R; Konz, W; Brandenburg, A; Michel, K; Boussard-Plédel, C; Bureau, B; Lucas, J; Reichlin, Y; Katzir, A; Fleischmann, N; Staubmann, K; Allabashi, R; Bayona, JM; Mizaikoff, B.
(2003): In situ sensing of volatile organic compounds in groundwater: first field tests of a mid-infrared fiber-optic sensing system.
Appl Spectrosc. 2003; 57(6):607-613

A prototype mid-infrared sensor system for the determination of volatile organic pollutants in groundwater was developed and tested under real-world conditions. The sensor comprises a portable Fourier transform infrared spectrometer, coupled to the sensor head via mid-infrared transparent silver halide fiber-optic cables. A 10 cm unclad middle section of the 6-m-long fiber is coated with ethylene propylene copolymer in order to enrich the analytes within the penetration depth of the evanescent field protruding from the fiber sensor head. A mixture of tetrachloroethylene, dichlorobenzene, diethyl phthalate, and xylene isomers at concentrations in the low ppm region was investigated qualitatively and quantitatively in an artificial aquifer system filled with Munich gravel. This simulated real-world site at a pilot scale enables in situ studies of the sensor response and spreading of the pollutants injected into the system with controlled groundwater How. The sensor head was immersed into a monitoring well of the aquifer system at a distance of I m downstream of the sample inlet and at a depth of 30 cm. Within one hour, the analytes were clearly identified in the fingerprint region of the IR spectrum (1300 to 700 cm(-1)). The results have been validated by head-space gas chromatography, using samples collected during the field measurement. Five out of six analytes could be discriminated simultaneously; for two of the analytes the quantitative results are in agreement with the reference analysis.
Autor*innen der BOKU Wien:
Allabashi Roza
Find related publications in this database (using NML MeSH Indexing)
Equipment Design -
Equipment Failure Analysis -
Fiber Optic Technology - instrumentation
Membranes, Artificial -
Optical Fibers -
Organic Chemicals - analysis
Pilot Projects -
Reproducibility of Results -
Sensitivity and Specificity -
Soil Pollutants - analysis
Spectroscopy, Fourier Transform Infrared - instrumentation
Transducers -
Volatilization -
Water Pollutants, Chemical - analysis

Find related publications in this database (Keywords)
chemical sensors
mid-infrared fiber-optic chemical sensors
FT-IR spectroscopy
on-line pollutant monitoring
groundwater monitoring
aquifer analysis
polymer membranes
silver halide fibers
volatile organic compounds

© BOKU Wien Impressum