On the Possibility of Analyzing Substances
by Spectroscopy Techniques in Ultraviolet and Visible Regions
without Using Standard Composition Samples

V. I. Baranov and L. A. Gribov

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences,
ul. Kosygina 19, Moscow, 117975 Russia

Received December 10, 1997

Abstract—The possibility of performing a quantitative molecular analysis of substances by spectral methods
in visible and ultraviolet regions without using standard composition samples (certified reference materials) is
considered. It is shown that the modern experimental technique of optical spectroscopy and the methods devel-
oped for calculations of electronic–vibrational spectra allow not only qualitative studies of substances but also
quantitative standardless analysis to be performed. Such an analysis can be carried out by using the integral
absolute intensity of the entire broad band (slightly structured spectra) or by using the intensity of several bands
and individual lines of the vibrational structure (fine-structured spectra). This permits substances and their mix-
ture with close spectral properties to be analyzed. Estimated expected errors in the determination of concentra-
tions are no higher than 30% at rather small amounts of a substance required for analysis (1 mg) and low con-
centrations of impurity molecules under study (10⁴%).

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