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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Barium(2+)

  • IUPAC Name: barium(2+)
  • Molecular Formula: Ba+2
  • InChI: InChI=1S/Ba/q+2
  • InChI Key: XDFCIPNJCBUZJN-UHFFFAOYSA-N

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Citations 3

"Electrochemical Response Of A Polypyrrole-dodecylsulfate Electrode With Multicharged Cations And Vitamins B1 And B6. Application As A Microsensor In Flow Injection Analysis"
Anal. Chim. Acta 1996 Volume 336, Issue 1-3 Pages 47-56
R. Carabias Martínez*, F. Becerro Domíngueza, I. M. Sierra Garcíaa, J. Hernández Méndeza, R. Córdova Orellanab and R. Schrebler Guzmánb

Abstract: The cited electrode was prepared by electropolymerization on to a Pt or vitreous C electrode (20 mm2 area) from a solution containing 0.23 M pyrrole/0.05 M SDS in 80% acetonitrile. A potential of +1.4 V vs. SCE was applied for 5 min followed by 5 potential scans from +0.7 V to -1.3 V and then a constant potential of +0.7 V for 5 min. The amperometric response of the electrode to multicharged cations (Cu2+, Sr2+, Ba2+, Mg2+ and Al3+) and vitamins [B1 (thiamine) and B6] was investigated by cyclic voltammetry by scanning the potential from +0.7 to -1.3 V at 25 mV/s. A linear relationship between the cathodic current at -0.8 V and the analyte concentration was obtained for concentrations up to 0.1-1 mM. The detection limits were 1 µM for all analytes except vitamin B6 (7.5 µM). RSD (n = 10) for concentrations of 0.1 mM were 1.7% (Ba2+) to 8% (thiamine). The electrode was used as an amperometric detector in a single channel FIA system with 10 mM glycine as the carrier stream (1.54 ml/min) and an injection volume of 200 µL. Linear calibration graphs were obtained for all analytes up to 1 mM except Al3+ (up to 0.1 mM). The detection limits were 0.1-0.34 µM. RSD (n = 10) were 0.6-1.6% at the 0.1 mM level.
Amperometry Electrode Electrode Electrode Voltammetry Sensor Detection limit Detector

"Displacement Post-column Detection Reagents Based On The Fluorescent Magnesium 8-hydroxyquinoline-5-sulfonic Acid Complex"
J. Chromatogr. A 1994 Volume 671, Issue 1-2 Pages 121-129
Charles A. Lucy* and Liwen Ye

Abstract: A non-specific reagent for the post-column detection of metal ions was obtained by displacement of Mg2+ from Mg(CDTA)2- and reaction of the liberated Mg2+ with 8-hydroxyquinoline-5-sulfonic acid (I) to form a fluorescent complex. The kinetics and equilibria of the reaction and the effects of sequential and simultaneous addition of Mg-CDTA and I are discussed. Most experiments were conducted using an HPLC system in the FIA mode, with detection at excitation and emission wavelengths of 360 and 500 nm, respectively. The optimum sensitivity was obtained at pH 8. For simultaneous addition of the reagents, alkaline earth metals gave a positive response, but there was no response for transition metals. Addition of Mg(CDTA)2- followed by I2- gave a positive response for Mg2+, Ca2+, Sr2+, Ba2+, Mn2+, Cu2+, Ni2+ and Co2+. The response for Mn2+ was linear for 25-2500 pmol.
HPLC Fluorescence Indirect Post-column derivatization Optimization pH 8-hydroxyquinoline-5-sulfonic acid

"A Sample Introduction Method Based On Negative Pressure In Flow Injection‐Capillary Electrophoresis System And Its Application To The Alkaline‐Earth Metal Cation Separation"
Anal. Lett. 2005 Volume 38, Issue 5 Pages 857-867
Jianwei Wang, Zuanguang Chen, Peixiang Cai, Jinyuan Mo

Abstract: A new sample introduction method based on negative pressure has been developed in the flow injection (FI)-capillary electrophoresis (CE) system with contactless conductivity detection (CCD). In the system, the sample was carried to the interface by background electrolyte (BGE), which was carried by a dual-channel peristaltic pump. Sample introduction into capillary was performed through the negative pressure at the outlet of capillary. Duration of the injection was controlled by a precise homemade time circuit connected to the voltage supply of vacuum pump. When the sample was transported to the inlet of capillary, the vacuum pump was started and a small volume sample was injected within 1.0-2.0 s. Negative pressures from 20 to 25 kPa are appropriate and other important injection parameters were studied. The RSD values (n=8) of the negatively pressurized injections, within the range of 0.8-1.1% for migration time, are comparable with those of gravity injection. The performance of the whole system was further demonstrated with satisfactory results in the separation of four alkaline-earth metal cations (Mg2+, Ca2+, Sr2+, Ba2+) with CCD.
Conductometry Electrophoresis Injection technique