On-line extraction of metal ions using liquid-liquid segmentation and a membrane type phase separator for fluorescence detection |
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Authors: | B D Karcher I S Krull R G Schleicher S B Smith |
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Institution: | (1) Barnett Institute and Department of Chemistry, Northeastern University, 02115 Boston, MA, USA;(2) Thermo Jarrell Ash, 8 East Forge Parkway, Box 9101, 02038 Franklin, MA, USA |
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Abstract: | Summary A liquid segmented post-column reaction system has been used to extract metal ions from an aqueous eluent into an organic
solvent for fluorescence detection. The metals Zr(IV), Ga(III), Sc(III), Y(III), In(III), Al(III), La(III), Zn(II), Cd(II),
Ca(II) and Mg(II) have been isocratically separated on a C18 column by virtue of the secondary chemical equilibrium established by an eluent containing n-octanesulfonate, tartaric acid,
and hydroxyisobutyric acid. The chelating reagent 8-hydroxyquinoline dissolved in methylisobutyl ketone (MIBK) was used to
extract the metals and a membrane type phase separator was effective at separating the phases and directing the organic stream
to the detector. The response for this detection approach was linear for metal ion concentrations spanning the range of the
detector, and detection limits for most metals were low parts-per-billion (ppb). Band broadening for the extraction system
was examined and compared to a direct post-column reaction using oxine dissolved in acetone. |
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Keywords: | Oxine Membrane phase separator Diamagnetic metal ions Post-column extraction Fluorescence Segmented flow reactor |
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