Study of solids deposition on inductively coupled plasma mass spectrometry samplers and skimmers

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Abstract
The change in pressure in the interface and ion optics regions of an inductively coupled plasma mass spectrometry (ICP-MS) system provides a convenient and simple method for studying the salt deposition process. The preliminary results reported here show a variety of complex behaviours. In many instances, a simple exponential decay of pressure (area) with time matched the data but in others more complex behaviour was seen. In general, deposition is minimised by low aerosol flow-rates and high power, but at the expense of analyte signal. With some matrices, the results shown here and also those reported by other workers show that a steady state may be reached at which deposition during analysis and desorption for a blank run may be balanced to give a pseudo-steady state with minimum instrumental drift.

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