University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Citations 2

"Multicomponent Determination By Flow Injection Analysis Using The PU 4021 Diode Array Detector. Direct Determination Of Lanthanides"
Collect. Czech. Chem. Commun. 1988 Volume 53, Issue 3 Pages 543-553
Kuban, V.;Dolezel, P.

Abstract: Flow injection analysis with multi-channel UV - visible diode-array detection was applied in the analysis of binary and ternary mixtures of Cu(II), Ni(II), Co(II) and U(VI). Samples were injected into a carrier stream (generally 1 mL min-1) of 1 mM HNO3 and the signal was recorded with a PU 4021 detector equipped with an 8 µL flow cell and interfaced to a TZ 4200 two-line recorder. The major components were determined with relative errors of 1 to 3% over the concentration. range 2 to 200 mM. The method was applied to determine Pr, Sm and Nd in rare-earth-metal oxide concentrates after dissolution in HCl or HNO3. The relative error was 5%.
Copper Nickel Cobalt Uranium Praseodymium Samarium Neodymium Metals, rare earth Spectrophotometry Simultaneous analysis

"Determination Of Rare-earth Elements By Ion Pair HPLC With Post-column Derivatization Using Arsenazo III"
Collect. Czech. Chem. Commun. 1988 Volume 53, Issue 8 Pages 1664-1677
Kuban, V.;Gladilovich, D.B.

Abstract: A portion (10 to 25 µL) of sample solution (prep. described) was analyzed on a column (15 cm x 3 mm) of Separon SGX C18 (5 µm) modified with sorbed ammonium dodecyl sulfate, protected by a column (5 cm x 3 mm) of Separon SGX C18 (5 µm) or Silperl silica gel (14 µm) with a mobile phase (1 mL min-1) of 20 to 160 mM ammonium DL-2-hydroxy-2-methylpropionate(I) solution (pH 4.5). Post-column derivatization was achieved with 5 µM-arsenazo III in 0.1 M formate buffer (pH 2.9 to 3.0); detection was at 660 nm. With isocratic elution, calibration graphs (peak height vs. concentration.) were rectilinear from 10 to 150 ng of rare-earth metal in 10 or 25 µL injected. With stepwise gradient elution with 40 mM I for 5 min, 80 mM I for the next 10 min and 160 mM I after 15 min, the calibration graphs were rectilinear from 6 to 155 ng of rare-earth metal in 10 or 25 µL injected. The method was applied in the determination of rare-earth metals in apatite, oxide concentrates, and a phosphor. Results agreed well with those obtained by optical methods.
Metals, rare earth HPLC Spectrophotometry Method comparison Post-column derivatization