Holmium oxide solution as a prototype intrinsic standard in molecular absorption spectrophotometry

John C. Travis; David L. Duewer

doi:10.1117/12.514532

8 August 2003 Holmium oxide solution as a prototype intrinsic standard in molecular absorption spectrophotometry

John C. Travis, David L. Duewer

Proceedings Volume 4826, Fourth Oxford Conference on Spectroscopy; (2003) https://doi.org/10.1117/12.514532
Event: Fourth Oxford Conference on Spectroscopy, 2002, Davidson, NC, United States

Abstract

Intrinsic standards can become an efficient mechanism for providing traceable reference materials for chemical spectrophotometry. The sealed holmium oxide (Ho₂O₃) in dilute acidic aqueous solution used by the U.S. National Institute of Standards and Technology as Standard Reference Material 2034 is a candidate material for an intrinsic wavelength standard in the ultraviolet and visible spectral regions. Low mass fractions of Ho₂O₃ in glass and as Ho³⁺(aq) solutions have long been favored for use as wavelength calibration materials in molecular absorption spectrophotometry on the basis of their spectral coverage and absorption band shape. Three national metrology institutes of the North American Cooperation in Metrology evaluated the performance of Ho³⁺(aq) certified reference materials under “routine” operating conditions using commercial instrumentation. The resulting data show a substantial level of agreement while also demonstrating that the wavelength comparability of the five instruments used by the participants can actually be improved by calibrating all of the instruments to the consensus band locations of Ho³⁺(aq) solution. A similar approach is being considered to establish intrinsic absorbance standards.

Citation Download Citation

John C. Travis and David L. Duewer "Holmium oxide solution as a prototype intrinsic standard in molecular absorption spectrophotometry", Proc. SPIE 4826, Fourth Oxford Conference on Spectroscopy, (8 August 2003); https://doi.org/10.1117/12.514532

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