Method and apparatus for the detection and identification of trace organic substances from a continuous flow sample system using laser photoionization-mass spectrometry
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United States of America Patent
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Jan 9, 2007
Grant Date -
Oct 27, 2005
app pub date -
Apr 20, 2005
filing date -
Apr 21, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are provided for identifying analytes at low concentrations in a liquid sample. The liquid sample is introduced through a continuous flow membrane inlet system. The analytes that permeate the membrane are analyzed by photoionization-time-of-flight mass spectrometry. The analytes remaining in the liquid sample that do not permeate the membrane are conducted to a capillary tube inlet that introduces the liquid sample and other analytes as droplets into the photoionization zone. Any analytes remaining absorbed or adsorbed on the membrane are driven through the membrane by application of heat. Analytes may be analyzed by either resonance enhanced multiphoton ionization (REMPI) or single photon ionization (SPI), both of which are provided in the apparatus and can be selected as alternative sources.
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