Detection system and method
First Claim
1. A chromatographic detection system comprising, in combination:
- A. a gas chromatograph having a chromatograph output port,B. a nitric oxide (NO) gas detector having a detector input port, means for reacting combustion products with ozone (O3), and means for detecting light having wavelength in the range 0.6-2.8 microns, andC. a convertor including;
i. an input port connected to said chromatograph output port having means to inject effluent from said chromatograph into said convertor,ii. conversion means to convert said injected effluent into said combustion products, said combustion products being in the gas phase, and having means to control said conversion to take place at a temperature in the range 600°
-1700°
C.,iii. a convertor output port connected to said detector input port, andiv. means for transferring said combustion products to said detector.
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Abstract
A detection system for detecting the presence of predetermined compounds in a sample. The system comprises a sample injection means, a chromatographic column, a conversion means and one or more specific gas detectors. The conversion means transforms the column effluent to combustion products in the gas phase, after which those combustion products are transferred to the specific gas detectors. In one embodiment for detecting nitrogen compounds, the conversion means includes an oxygen-rich flame, a means to control the flame to have a temperature in the range 600°-1700° C., means to inject the column effluent into the flame, and an output port for transferring the flame effluent to a specific nitrogen detector.
28 Citations
10 Claims
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1. A chromatographic detection system comprising, in combination:
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A. a gas chromatograph having a chromatograph output port, B. a nitric oxide (NO) gas detector having a detector input port, means for reacting combustion products with ozone (O3), and means for detecting light having wavelength in the range 0.6-2.8 microns, and C. a convertor including; i. an input port connected to said chromatograph output port having means to inject effluent from said chromatograph into said convertor, ii. conversion means to convert said injected effluent into said combustion products, said combustion products being in the gas phase, and having means to control said conversion to take place at a temperature in the range 600°
-1700°
C.,iii. a convertor output port connected to said detector input port, and iv. means for transferring said combustion products to said detector. - View Dependent Claims (2, 3, 4, 5)
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6. A method for analysis of a sample dissolved in a gas phase solution comprising the sequential steps of:
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A. passing said solution through a gas chromatograph to produce a gas phase effluent, B. converting said effluent into combustion products in the gas phase at a temperature in the range 600°
-1700°
C.,C. transferring said combustion products to a nitric oxide (NO) detector, and D. detecting the presences of NO at said detector, wherein said detecting step comprises the sub-steps of reacting said combustion products with ozone (O3), and detecting light having wavelength in the range 0.6-2.8 microns. - View Dependent Claims (7, 8, 9, 10)
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Specification