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000062967 0247_ $$2DOI$$a10.1016/j.colsurfa.2008.05.012
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000062967 084__ $$2WoS$$aChemistry, Physical
000062967 1001_ $$0P:(DE-Juel1)VDB764$$aKlauth, P.$$b0$$uFZJ
000062967 245__ $$aLight fiber optic probe for measuring internal breakthrough of rare earth ion-labelled microspheres in porous media under unsaturated  conditions
000062967 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2008
000062967 300__ $$a173 - 179
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000062967 440_0 $$01360$$aColloids and Surfaces A:Physicochemical and Engineering Aspects$$v325$$x0927-7757$$y3
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000062967 520__ $$aApplication of minimally invasive probes for measuring fluorescent labelled colloids inside sand columns resulted in internal breakthrough curves at given points, that provided information about mass distributions without disrupting the column. Until now, light fiber optic probes were used in combination with organic fluorophores like fluoresceine or rhodamine, which have inherent disadvantage, such as comparably small Stoke's shifts and quenching at high concentrations. These may be overcome using rare earth ion complexes to label colloidal particles like microspheres (MS). Furthermore, these dyes have large fluorescent lifetimes compared to organic fluorophores, which readily allows the elimination of background fluorescence using time-resolved spectroscopy. We demonstrate the novel application of rare earth ionlabelled microspheres as colloidal tracers in column experiments under unsaturated conditions in porous media in coupling with a detection setup based on internal light fiber optic probes. Differences in mass budgets between internal detection and detection at the outlet were confirmed afterwards by invasive refurbishment of the column matrix. (c) 2008 Elsevier B.V. All rights reserved.
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000062967 65320 $$2Author$$alight fiber optic probe
000062967 65320 $$2Author$$arare earth ion-chelate complexes
000062967 65320 $$2Author$$amicrospheres
000062967 65320 $$2Author$$aporous media
000062967 65320 $$2Author$$ainternal BTC
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000062967 65320 $$2Author$$aunsaturated conditions
000062967 7001_ $$0P:(DE-HGF)0$$aJoschko, A.$$b1
000062967 7001_ $$0P:(DE-Juel1)VDB9397$$aUstohal, P.$$b2$$uFZJ
000062967 7001_ $$0P:(DE-HGF)0$$aBüddefeld, J.$$b3
000062967 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, E.$$b4$$uFZJ
000062967 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b5$$uFZJ
000062967 7001_ $$0P:(DE-HGF)0$$aLezhnina, M.$$b6
000062967 7001_ $$0P:(DE-HGF)0$$aKynast, U.$$b7
000062967 773__ $$0PERI:(DE-600)1500517-3$$a10.1016/j.colsurfa.2008.05.012$$gVol. 325, p. 173 - 179$$p173 - 179$$q325<173 - 179$$tColloids and surfaces / A$$v325$$x0927-7757$$y2008
000062967 8567_ $$uhttp://dx.doi.org/10.1016/j.colsurfa.2008.05.012
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