By the chemical reaction of Cr at high temperature,the fractionation effect of hydrogen isotope was reduced,and hydrogen element was converted into hydrogen gas as much as possible,thus accurate hydro-gen isotope ratios were obtained.The filling material of the original method was replaced with chromium particles and corundum spheres(the new method).The method had good linearity(R2=0.999 5)in simultane-ously determining stable hydrogen isotope reference materials of three kinds of solid and three kinds of water sam-ples.The hydrogen isotope measurements of solid samples could be directly associated with the internationally recognized water standard material VSMOW-SLAP scale.The results by the original and new methods for the de-termination of chemicals containing impurities,hair and tea samples were different,but those of polyethylene without impurities were both accurate.
Stable hydrogen isotopeIsotopic mass spectrometryChromiumConversion at high tempera-tureWater quality
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