Evaluation of Perrhenate Spectrophotometric Methods in Bicarbonate and Nitrate Media

Brian A. Lenell, Yuji Arai

Research output: Contribution to journalArticlepeer-review


2-pyridyl thiourea and methyl-2-pyridyl ketoxime based perrhenate, Re(VII), UV-vis spectrophotometric methods were evaluated in nitrate and bicarbonate solutions ranging from 0.001 M to 0.5 M. Standard curves at [Re]=2.5-50 mg L-1 for the Re(IV)-thiourea and the Re ketoxime complexes were constructed at 405 nm and 490 nm, respectively. Detection of limits for N-(2-pyridyl) thiourea and methyl-2-pyridyl ketoxime methods in ultrapure water are 3.06 mg/L and 4.03 mg/L, respectively. Influences of NaHCO3 and NaNO3 concentration on absorbance spectra, absorptivity, and linearity were documented. For both methods, samples in ultrapure water and NaHCO3 have an R2 value>0.99, indicating strong linear relationships. Statistical analysis supports that NaHCO3 does not affect linearity between standards for either method. NaNO3 causes major interference with the ketoxime method above 0.001 M NaNO3. Data provides information for practical use of Re spectrophotometric methods in environmental media that is high in bicarbonate and nitrate.

Original languageEnglish (US)
Pages (from-to)690-698
Number of pages9
StatePublished - Apr 1 2016


  • Bicarbonate
  • Detection
  • Methyl-2-pyridyl ketoxime
  • N-(2-pyridyl) thiourea
  • Nitrate
  • Perrhenate
  • Rhenium
  • Spectrophotometry

ASJC Scopus subject areas

  • Analytical Chemistry


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