Application of a fiber-optic NIR-EFA sensor system for in situ monitoring of aromatic hydrocarbons in contaminated groundwater

Buerck, Jochen; Roth, S.; Kraemer, K.; Scholz, Michael; Klaas, Norbert

doi:10.1016/s0304-3894(00)00335-6

Cited by 61 publications

(36 citation statements)

References 12 publications

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“…Buerck et al (2001) devised a fibre-optic sensor system for the determination of aromatic hydrocarbons in groundwater or industrial wastewater. Meanwhile Vohra et al (1996) also devised another remote sensor to detect trichloroethylene (TCE) in sand.…”

Section: Organic Contaminantsmentioning

confidence: 99%

Potential of integrated field spectroscopy and spatial analysis for enhanced assessment of soil contamination: A prospective review

et al. 2015

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a b s t r a c tThere are tens of millions of contaminated soil sites in the world, and with an increasing population and associated risk there is a growing pressure to remediate them. A barrier to remediation is the lack of cost-effective approaches to assessment. Soil contaminants include a wide range of natural and synthetic metallic and organic compounds and minerals thus making analytical costs potentially very large. Further, soil contaminants show a large degree of spatial variation which increases the burden on sampling costs. This paper reviews potentially cost-effective methods for measurement, sampling design, and assessment. Current tiered investigation approaches and sampling strategies can be improved by using new technologies such as proximal sensing. Design of sampling can be aided by on-the-go proximal soil sensing; and expedited by subsequent adaptive spatially optimal sampling and prediction procedures enabled by field spectroscopic methods and advanced geostatistics. Field deployment of portable Visible & Near Infrared [wavelength 400-2500 nm] (Vis-NIR) and X-ray fluorescence (PXRF) spectroscopies will require special calibration approaches but show huge potential for synergistic use. The use of mid-infrared spectroscopy [wavelength 2500-25,000 nm, wavenumber 4000-400 cm −1 ] (MIR) for field implementation requires further adaptive research. We propose an integrated field-deployable methodology as a basis for further developments. Crown

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Section: Organic Contaminantsmentioning

confidence: 99%

Potential of integrated field spectroscopy and spatial analysis for enhanced assessment of soil contamination: A prospective review

et al. 2015

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“…In other words the contaminated polymer exhibits a complex refractive index. The propagation mode, because of the tail of the electromagnetic field profile in polymeric overlay, suffers a power attenuation due to the hydrocarbon (Schwotzer et al 1997;Buerck et al 2001).…”

Section: Theorymentioning

confidence: 99%

Design of an optical sensor array for hydrocarbon monitoring

et al. 2009

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Evanescent field optical sensors are accurately designed for hydrocarbon monitoring in water. Various kinds of waveguide sensors are optimized by considering a polydimethylsiloxane polymeric overlay as sensor region. The simulation results suggest that the selection of a suitable waveguide cross section can enhance the sensor performance. In particular, the hollow waveguide sensor exhibits very intriguing performance, the absorbance being quite linear with respect to the contaminant concentration. For the toluene pollution the absorbance exhibits a slope S A TE = 2.52 × 10 −2 ppm −1 for a waveguide reference length L = 1.18 mm. In order to simultaneously detect different pollutants in water such as toluene, benzene, chlorobenzene and ethilbenzene, an array of four miniaturized hollow waveguide sensors is designed.

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“…al. investigated this approach for determining the hydrocarbon concentration in water by means of a 11-m long PDMS-clad optical fiber operating in the near infrared NIR wavelength range [18]. In the NIR, the intense and broad absorption of the water O-H group, that occurs almost over all the NIR spectral range, masks the less intense C-H absorption bands of the organic compounds, preventing the direct determination of hydrocarbons in water [19].…”

Section: Introductionmentioning

confidence: 99%