[en] Pyrolysis-combustion, direct combustion and hydrolysis procedures have been developed for study of returned lunar samples. They are also applicable to the analysis of elements on small geological specimens. During pyrolysis-combustion, the sample is degassed at 150⁰C, heated in vacuum to 1,225⁰C and the gaseous products are measured and collected. The pyrolysis residue is combusted in a partial atmosphere of oxygen and additional gaseous products are collected. Measured are C; total H, He and N, combusted C, delta ¹³C sub(PDB) and delta ¹⁵N sub(air). By direct combustion in oxygen, the abundances of C, S, N and He, and delta ¹³C sub(PDB), delta ¹⁵N sub(air) and delta ³⁴S sub(CD) are determined. Hydrolysis involves reacting the sample in 6N H₂SO₄ overnight at 105⁰C. The gaseous products measured are S, delta³⁴S sub(CD), CH₄, He and % metallic Fe (from H₂ released). (Mori, K.)

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