Methods and apparatus for analysis of complex mixtures
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United States of America Patent
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Oct 26, 1999
Issued Date -
N/A
app pub date -
Apr 28, 1997
filing date -
Apr 26, 1996
priority date (Note) -
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Abstract
This invention provides methods and apparatus for determining the presence or absence of a specific constituent in a mixture. A thermal desorption unit includes a body providing a desorption chamber, a removable end cap for closing the chamber, a desorber heating system arranged to heat the desorption chamber, a gas inlet to the desorption chamber, and a gas outlet from the desorption chamber. A valve assembly can operate in a run mode to direct a carrier gas to the thermal desorption unit gas inlet, and couple the thermal desorption unit gas outlet to an inlet of a sample analysis instrument. The valve assembly also can operate in a flush mode to direct the carrier gas to the inlet of the gas analysis instrument, direct a flushing gas to the thermal desorption unit gas inlet, and couple the thermal desorption unit gas outlet to an exhaust.
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