No abstract

No abstract

No abstract

No abstract

Pyrolysis-combustion, direct combustion and hydrolysis procedures have been developed for study of returned lunar samples. These procedures are also applicable to the analysis of numerous elements on relatively small geological specimens. During pyrolysis-combustion, the sample is degassed at 150°C, heated in vacuum to 1,225°C and the various gaseous products are measured and collected. Then, the pyrolysis residue is combusted in a partial atmosphere of oxygen and additional gaseous products are collected. The above method allows the following measurements: C (as C02, CH4 and CO); total H, total He, total N, combusted C, S13CPDB and 515Nair. By direct combustion in oxygen, the abundances of C, S, N and He, as well as 513CPDB, Sl5Nair and 834SCD are determined. Hydrolysis involves reacting the sample in 6N H2S04 overnight at 105°C. The gaseous products collected and measured are: S (as H2S), S34SCD, acid hydrolyzable .CH4. He and % metallic Fe (from H2 released). Standards were analyzed to demon strate the capabilities and reliabilities of the different experiments. A suite of lunar samples was studied using these new techniques. Replicate and duplicate analyses of these samples and a comparison with literature values obtained by different methods show a high degree of confidence which can be placed in the techniques described.

No abstract

No abstract

No abstract