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Problems associated with intermittent and variable degrees of sample blackening are often reported for studies involving the preparation of CO 2 -bearing silicate glasses in piston- cylinder apparatus. This phenomenon is generally attributed to H infiltration, which leads to the reduction of CO 2  and the precipitation of graphite with the concomitant formation of water. In this study we demonstrate that carbon diffusion into platinum capsules may be a common cause of blackened glasses and this process may be detected using fourier transform infrared spectroscopy (FTIR) to identify the presence of CO without elevated H 2 O contents. The simulated infiltration of  12 C from a graphite furnace into a  13 C -bearing sample is illustrated using secondary ion mass spectroscopy (SIMS) and micro- FTIR analysis.

Reduction in piston-cylinder experiments: The detection of carbon infiltration into platinum capsules