Fiber-Optic Raman Spectroscopy for in Situ Monitoring of Metal-Ion Complexation by Ligands Immobilized onto Silica Gel

Uibel, Rory H.; Harris, Joel M.

doi:10.1366/0003702001949005

Fiber-Optic Raman Spectroscopy for in Situ Monitoring of Metal-Ion Complexation by Ligands Immobilized onto Silica Gel

Journal Article · Fri Dec 01 00:00:00 EST 2000 · Applied Spectroscopy

DOI:https://doi.org/10.1366/0003702001949005· OSTI ID:2480725

Uibel, Rory H. ^[1]; Harris, Joel M. ^[1]

University of Utah, Salt Lake City, UT (United States)

Fiber-optic Raman spectroscopy was adapted to measurements of metal-ion complexation by silica-immobilized 8-hydroxyquinoline (8HQ) under conditions typical of metal-ion preconcentration or recovery applications. The extraction of metal ions from aqueous sources onto immobilized ligands is useful in environmental cleanup initiatives and in the preconcentration of metal ions for ultratrace detection. In situ vibrational spectroscopy of metal complexation by silica-immobilized ligands can assist in the development of these applications. In the present work, in situ Raman spectroscopy and flow methods allowed the reactivity of silica-immobilized 8HQ with Cu²⁺ to be investigated. The structure of the complexed and uncomplexed neutral and protonated forms of the ligand could be resolved and quantified in Raman spectra taken under different solution conditions. Spectra of the ligand bound to different metal ions could be distinguished as well. Raman spectra taken under batch sampling conditions were able to confirm a 1:1 metal/ligand stoichiometry of the silica-immobilized 8HQ complex, which was reasonable in light of the surface coverage by the ligand. In situ monitoring under flowing solution conditions allowed changes in the state of binding to be followed in real time.

View Accepted Manuscript (DOE)

Research Organization:: University of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: FG03-93ER14333

OSTI ID:: 2480725

Journal Information:: Applied Spectroscopy, Journal Name: Applied Spectroscopy Journal Issue: 12 Vol. 54; ISSN 0003-7028

Publisher:: Society for Applied SpectroscopyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Raman spectroscopy
fiber optic spectroscopy
immobilized ligands

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