Разработка стандартных образцов изотопного состава углерода нового типа

Abstract

We developed a new reference standard of carbon isotope ratio¹³С/¹²С for measurements of δ¹³С_VPDB in CO₂. There is a gas mixture of pure¹²CO₂,¹³CO₂ and N₂. The new reference standard eliminates the need of preparation of existing reference standards when measuring the δ¹³С_VPDB in CO₂. The procedure of preparation and verification of reference standard is described in detail, and their stability is checked. The developed standard samples can be used for verification and calibration of both isotope infrared gas analyzers and isotope mass spectrometers.