Isotopic spectral analysis of inorganic gases

The possibilities for isotopic spectral gas analysis are considered. The method is based on a combination of an isotope dilution method (with or without further physico-chemical transformation of the resulting analytical mixture) and a spectroscopic measurement of the isotope composition of the element to be determined. The transformation includes various processes of isotope balancing, their accumulation and isolation. Detection limits for instrumental techniques are 100 ppb–10 ppt and for the combined techniques 1 ppm–1 ppb. Calibration of the method does not require reference gas samples based on the composition of the analysed gas.