Mobile noble gas analysis: A trial of on-site measurement of noble gas elemental abundance

概要

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A vacuum sample crushing system equipped with a quadrupole residual gas analyzer was operated out of laboratory and was proved to perform reliable sample analyses of noble gases and coexisting carbon dioxide, water, and nitrogen. Careful sealing at disassembly and assembly maintained the apparatus under ultra high vacuum of 10-5 Pa that is comparable to the pressure in usual operation. The analyses of a gas rich basaltic glass from East Pacific Rise, 6K834R4, represented minimum detection limit down to 7 × 10-7 Pa as a partial pressure in the instrument; the value was determined as the difference between an apparent value of change from a base line. The result demonstrates the potential of "on-site" gas analyses on fluids on research vessels or vehicles when the sufficient electric power is supplied and the apparatus is treated carefully at transportation and assembly.