Method for Cleaning an Atmospheric Pressure Chemical Ionization Source
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United States of America Patent
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Issued Date -
Sep 18, 2014
app pub date -
Mar 12, 2014
filing date -
Mar 14, 2013
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Abandoned
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Abstract
Build-up of surface contamination within an atmospheric pressure chemical ionization (APCI) source of a mass spectrometer (MS) is reversed by switching the APCI polarity to the opposite setting used for analyte ionization after the analytes have been ionized and measured. A solvent or mixture of solvents is passed through the ion source during the opposite-polarity operation. This cleaning procedure may be repeated after each sample analysis, especially by incorporating the cleaning procedure into an assay method. The cleaning procedure may be employed simultaneously with chromatography column washing steps and enables a mass spectrometer to maintain useful analysis sensitivity without a need for manual ion source cleaning.
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