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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Tantalum

  • IUPAC Name: tantalum
  • Molecular Formula: Ta
  • CAS Registry Number: 7440-25-7
  • InChI: InChI=1S/Ta
  • InChI Key: GUVRBAGPIYLISA-UHFFFAOYSA-N

@ ChemSpider@ NIST@ PubChem

Citations 5

"Online Ion-exchange Separation And Determination Of Niobium, Tantalum, Tungsten, Zirconium, And Hafnium In High-purity Iron By Flow Injection Inductively Coupled Plasma Mass Spectrometry"
Anal. Chim. Acta 1995 Volume 315, Issue 3 Pages 331-338
Aurora G. Coedo*, Teresa D. López and F. Alguacil

Abstract: A study was made to investigate the feasibility of using an anion-exchange resin for on-line separation of trace amounts of niobium, tantalum, tungsten, zirconium and hafnium from iron matrix samples. The incorporation of a micro-column packed with Dowex 1X8-100 ion-exchange resin into a flow injection system is presented. The detection was done with inductively coupled plasma mass spectrometry (ICP-MS). The sample treatment, optimization of analytical variables and measurable concentration levels are discussed. Recoveries from standard additions to a high-purity iron were for all the analytes close to 100%, with relative standard deviations ranging from 0.7 to 3.0%. The limits of quantification (10 sn-1) calculated from a 5% (m/v) iron sample solution were 8, 5, 14, 12 and 10 ng g-1 for Nb, Ta, W, Zr and Hf, respectively. The accuracy of the proposed method was tested by determining these elements in Euronorm-CRM 098-1 reference material. Recoveries from 0.250 g test portions of the above reference material spiked with 2.5 and with 12.5 ng each of the five analytes are reported.
High purity Ion exchange Mass spectrometry

"Analysis Of Carbide And Intermetallic Phase γ Isolates In Nickel Alloys By Means Of Injection Method Of Flame Atomic Absorption Spectrometry"
Microchim. Acta 1987 Volume 91, Issue 1-6 Pages 201-209
Andrzej Wyciślik

Abstract: The construction of a PTFE crater manifold and a portable capillary bearing is described for use in a flow injection AAS method for analysis of carbide and intermetallic phase γ' isolates in nickel alloys. The γ' phase was isolated by anodic dissolution in HClO4 - HNO3 - methanol. The isolate was dissolved in HNO3 - HF - water and the solution was evaporated to dryness; the residue was heated to boiling with HCl and HF, NH4F was added to the cooled solution and the solution was diluted with water. Niobium and Ta were determined by the method of Welcher and Kriege (At. Absorption Newsl., 1969, 8, 97); Al, Ti and V were determined by the standard-additions method; the carbide isolates were analyzed by the method of Sauer and Nitsche (Arch. Eisenhuettenwes., 1969, 40, 891). The coefficient of variation for Al, Ti, Mo, Co, W, Nb, Cr and Ta were 3.5 to 4.2, 4.1 to 4.6, 3.8 to 4.2, 2.5 to 2.8, 8.6 to 8.8, 11.2 to 11.6, 3.1 to 3.4 and 10.2 to 10.6%, respectively.
Alloy Spectrophotometry Standard additions calibration

"Online Monitoring Of Monoclonal Antibody Production With Regenerable Flow Injection Immuno Systems"
J. Biotechnol. 1994 Volume 32, Issue 3 Pages 213-220
Andreas Gebbert, Manuel Alvarez-Icaza, Heinz Peters, V. Jäger, Ursula Bilitewski* and Rolf D. Schmid

Abstract: In this paper two systems for the observation of the production of mouse-IgG during the cultivation of hybridoma cells in a perfusion reactor are presented. The direct immunosystem is based on the detection of changes in capacitance of a dielectric layer (tantalum oxide) on a metal surface (tantalum) when antibodies bind to immobilized anti-antibodies. The sensor consisted of a 25 nm tantalum oxide layer, electrochemically grown onto a laser patternized 1 micron thick tantalum layer. The indirect system is based on an automated fluorimetric sandwich ELISA system with β-galactosidase conjugated secondary antibodies. Two cultivations of mouse hybridoma cells in a 2-1 perfusion reactor were performed. The first cultivation was monitored with the capacitance system, the second cultivation was monitored with the fluorimetric system.
Fermentation broth Capacitance Immunoassay Fluorescence Perfusion

"Flow Injection Online Resin Separation-spectrophotometry For Determination Of Trace Tantalum In The Presence Of A Large Quantity Of Niobium"
Youkuangye 1998 Volume 17, Issue 3 Pages 194-199
Yu Yiyun

Abstract: A new and high sensitivity method has been developed for the determine of trace tantalum in the presence of a great quantity of niobium. The method was as follows: the sample amt. (18 µL) necessary for the flow injection analysis was taken, 1 mol/L HCl + 1% HF medium was used as exchange solution, trace Ta was adsorbed on the miniature column B with anion exchange resion while sepg. out a large quantity of Nb, and then the solution of 0.66 mol/L NH4Cl + 0.33 mol/L NH4F was used as the Ta eluant. The eluate containing Ta was mixed and reacted with BPR and CTMAB reagents in the presence of buffer solution and complexing agents, and the absorbance of the violet multicomponent complex formed was measured at 620 nm and 38°C after stopped-flow for 3 min. The Ta2O5 determination range was 0.5~0.5 g/L. The relative standard deviation of the method was ± 5%. The recoveries of Ta were 90%~100%. The determination speed was about 7 samples per h.
Ion exchange Spectrophotometry Resin Interferences Buffer Complexation Stopped-flow Heated reaction Column

"Differential-flow Analysis With Ion-selective Cells. Determination Of Tantalum And Fluorine"
J. Anal. Chem. 1991 Volume 46, Issue 7 Pages 1261-1267
Borzitsky, Y.A.;Dvinin, A.V.;Urusov, Y.I.;Petrukhin, O.M.

Abstract: A differential ionometric cell containing an exchangeable TaF6- or F- ion-selective module was proposed for continuous-flow analysis. The TaF6--selective module was made from a plastic tube (i.d. 8 mm) comprising an ion-selective membrane electrode prepared from 10 mM tetradecylphosphonium hexafluorotantalate in dibutyl phthalate and PVC. The F--selective module was based on a EuF3-doped LaF3 monocrystal (diameter of 7 mm) contained in a fluoroplastic tube which was pressed in a poly(methyl methacrylate) block. Measurements were made vs. Ag - AgCl. The cell was used for determination of Ta in Ta(OH)5 (after conversion into TaF6- by evaporation with HF) and F in K2ZrF6 or NH4F. Working ranges were 0.5 to 1.5 mM Ta and 10 to 40 mM F. The coefficient of variation were 0.55 and 0.7% for Ta and F, respectively. Results for Ta are compared with those obtained by extraction - gravimetry. The output was 20 samples in 7 h.
Electrode Sample preparation Differential detection Extraction Method comparison