Abstract

Estimations of the uncertainty of eight significant values (λ = 235, 257, 313, 322, 323, 345, 346, and 350 nm) of apparent molar absorptivities in the UV region have been obtained for acidic potassium dichromate solutions at pH 2.21-2.25, recommended as Standard Reference Materials (SRMs). The uncertainties include all the usual sources of possible systematic error in a commercial microprocessor-controlled spectrophotometer. The comparison of these values with those provided by the National Bureau of Standards (U.S.A.) indicates that a precision of ± 0.40% has been obtained throughout the absorptivity range. Likewise, the uncertainty in the linearity of experimental absorbances for the eight wavelengths has been estimated, and a table has been drawn up of the absorptivity values and their uncertainties at 10-nm increments over the wavelength range of 200 to 500 nm.

Spectrophotometry at the Bureau of Standards1

K. S. Gibson
J. Opt. Soc. Am. 21(9) 564-587 (1931)

A Wavelength Standard for Ultraviolet-Visible-Near Infrared Spectrophotometry

J. McNeirney and Walter Slavin
Appl. Opt. 1(3) 365-367 (1962)

An Alkaline Solution of Potassium Chromate as a Transmittancy Standard in the Ultraviolet*

Geraldine Walker Haupt
J. Opt. Soc. Am. 42(7) 441-447 (1952)

Rocket instrument for far-UV spectrophotometry of faint astronomical objects

G. F. Hartig, W. G. Fastie, and A. F. Davidsen
Appl. Opt. 19(5) 729-740 (1980)

Highly stable, monochromatic and tunable optical radiation source and its application to high accuracy spectrophotometry

Valerie E. Anderson, Nigel P. Fox, and David H. Nettleton
Appl. Opt. 31(4) 536-545 (1992)