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MPSS: A New Scattering Technique for Sensitive Measuring of the Total Absorption of Fluids

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Abstract:

Optical methods are appropriate tools to detect organic micro-pollutants in fluids. A simple technique is introduced which uses radiation scattered elastically by the fluid. Two different signals are measured: (1) the linear or conventional scattering (CS), which occurs at short pathlengths of the incidence radiation in the fluid, and (2) the multipath-saturation scattering (MPSS) originating at long pathlengths, e.g., in multipath-reflection cuvettes, where the radiation is fully absorbed by the fluid. A relation between the scattering signals and the total absorption coefficient of the fluid is theoretically derived. A simple experiment is performed that takes into consideration the scattering of distilled water polluted with azobenzene and quinine-sulfate. A xenon lamp and a nitrogen laser are used to generate CS and MPSS. The scattering ratio CS/MPSS yields the total absorption directly. In comparison to the conventional absorption technique, CS/MPSS is characterized by a higher sensitivity.

Keywords: ANALYTICAL SPECTROSCOPY SPECTROSCOPIC TECHNIQUES SCATTERING FLUIDS ORGANIC SUBSTANCES

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702971940107

Publication date: February 1, 1997

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