TY  - JOUR
AU  - Klauth, P.
AU  - Joschko, A.
AU  - Ustohal, P.
AU  - Büddefeld, J.
AU  - Klumpp, E.
AU  - Vereecken, H.
AU  - Lezhnina, M.
AU  - Kynast, U.
TI  - Light fiber optic probe for measuring internal breakthrough of rare earth ion-labelled microspheres in porous media under unsaturated  conditions
JO  - Colloids and surfaces / A
VL  - 325
SN  - 0927-7757
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - PreJuSER-62967
SP  - 173 - 179
PY  - 2008
N1  - Record converted from VDB: 12.11.2012
AB  - Application 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000258990200010
DO  - DOI:10.1016/j.colsurfa.2008.05.012
UR  - https://juser.fz-juelich.de/record/62967
ER  -