Method and apparatus for determination of water and for normal phase liquid chromatography
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United States of America Patent
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Sep 2, 2008
Grant Date -
Dec 2, 2004
app pub date -
Aug 20, 2002
filing date -
Aug 22, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for calibrating an analysis instrument, e.g., a gas chromatograph, for water analysis that includes four steps. The first step is to continuously remove water from a liquid that contains water to produce a liquid containing a reduced amount of water such as by membrane pervaporation. The second step is to analyze the liquid containing a reduced amount of water for water by a reference water analysis method such as by Karl Fischer titration. The third step is to analyze the stream of liquid containing a reduced amount of water using the instrument to be calibrated, e.g., a gas chromatograph having a helium photoionization pulse discharge detector. The fourth step is to calibrate the instrument using the analysis of the second step. In a related embodiment, a system for normal phase chromatography.
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