Abstract

The routine mass spectrometric determination of moisture in gas samples is plagued with severe difficulties due to incomplete and nonreproducible transport of the water molecules through the spectrometer inlet system. These difficulties can be overcome by heating of the inlet system to above 100°C, but this requires precise thermostatting of the entire inlet and usually some other inlet modifications. For gas mass spectrometers not equipped with heated inlets and for laboratories where moisture analysis is called for only occasionally, these necessary modifications can be a sizeable undertaking. There is also evidence that water vapor reacts with the ion source filament and/or impurities collected on surfaces in the source region which may influence the accuracy of determining small amounts of water.

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