Multiplexed electronically programmable multimode ionization detector for chromatography
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 Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- Assignee:
- Dept. of Energy
- Patent Number(s):
- PATENTS-US-A7196693
- Application Number:
- ON: DE89009758
- OSTI ID:
- 6415321
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201 -- Chemical & Physicochemical Properties
440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
CHROMATOGRAPHY
DESIGN
DIAGRAMS
ELECTRON-CAPTURE DETECTORS
FLOWSHEETS
GAS CHROMATOGRAPHY
INVENTIONS
MEASURING INSTRUMENTS
ORGANIC COMPOUNDS
RADIOMETRIC GAGES
SEPARATION PROCESSES