发明名称 |
Variable pressure ionization detector for gas chromatography |
摘要 |
Method and apparatus for differentiating organic compounds based on their electron affinity. An electron capture detector cell (ECD) is operated at pressures ranging from atmospheric to less than 1 torr. Through variation of the pressure within the ECD cell, the organic compounds are induced to either capture or emit electrons. Differentiation of isomeric compounds can be obtianed when, at a given pressure, one isomer is in the emission mode and the other is in the capture mode. Output of the ECD is recorded by chromatogram. The invention also includes a method for obtaining the zero-crossing pressure of a compound, defined as the pressure at which the competing emission and capture reactions are balanced and which may be correlated to the electron affinity of a compound.
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申请公布号 |
US4721858(A) |
申请公布日期 |
1988.01.26 |
申请号 |
US19860854236 |
申请日期 |
1986.04.21 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY |
发明人 |
BUCHANAN, MICHELLE V.;WISE, MARCUS B. |
分类号 |
G01N27/66;G01N30/70;(IPC1-7):G01N27/70 |
主分类号 |
G01N27/66 |
代理机构 |
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地址 |
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