Multiplexed electronically programmable multimode ionization detector for chromatography

Patent · Thu May 19 00:00:00 EDT 1988

OSTI ID:6415321

Wise, M. B.; Buchanan, M. V.

Method and apparatus for detecting and differentiating organic compounds based on their electron affinity. An electron capture detector cell (ECD) is operated in a plurality of multiplexed electronically programmable operating modes to alter the detector response during a single sampling cycle to acquire multiple simultaneous chromatograms corresponding to each of the different operating modes. The cell is held at a constant subatmospheric pressure while the electron collection bias voltage applied to the cell is modulated electronically to allow acquisition of multiple chromatograms for a single sample elution from a chromatograph representing three distinctly different response modes. A system is provided which automatically controls the programmed application of bias pulses at different intervals and/or amplitudes to switch the detector from an ionization mode to the electron capture mode and various degrees therebetween to provide an improved means of tuning an ECD for multimode detection and improved specificity. 6 figs.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-84OR21400
• Assignee: Dept. of Energy
• Patent Number(s): PATENTS-US-A7196693
• Application Number: ON: DE89009758
• OSTI ID: 6415321
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTRON-CAPTURE DETECTORS
DESIGN
FLOWSHEETS
GAS CHROMATOGRAPHY
INVENTIONS
ORGANIC COMPOUNDS
CHROMATOGRAPHY
DIAGRAMS
MEASURING INSTRUMENTS
RADIOMETRIC GAGES
SEPARATION PROCESSES
440300* - Miscellaneous Instruments- (-1989)
400201 - Chemical & Physicochemical Properties