GB1057905A - Gas chromatograph detector - Google Patents
Gas chromatograph detectorInfo
- Publication number
- GB1057905A GB1057905A GB6586/64A GB658664A GB1057905A GB 1057905 A GB1057905 A GB 1057905A GB 6586/64 A GB6586/64 A GB 6586/64A GB 658664 A GB658664 A GB 658664A GB 1057905 A GB1057905 A GB 1057905A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- anode
- chamber
- source
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
- G01N27/66—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber and measuring current or voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/68—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using electric discharge to ionise a gas
- G01N27/70—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using electric discharge to ionise a gas and measuring current or voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/70—Electron capture detectors
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Toxicology (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1,057,905. Electrophysical measurements. BECKMAN INSTRUMENTS, Inc. Feb. 17, 1964 [Feb. 20, 1963], No. 6586/64. Heading G1N. [Also in Division H1]. A detector for a gas chromatograph comprises a chamber 13 including an anode 22 and a radiant energy passing cathode 18, means for flowing a gas stream through the zone between the anode and cathode, and a light source 14 for directing light on to the cathode 18 for releasing photoelectrons into the chamber. In the single cell embodiment shown the source 14 is an ultraviolet lamp, and an additional needle anode 21 is provided. Connection to a mesh screen cathode 18 is made via a terminal 19 and wire 20. A stream of sample gas is passed through chamber 13 via pipes 23, 24 and a reference or carrier gas is passed through the cathode 18 from a pipe 25 to prevent contamination of the cathode by the sample gas. The cathode is preferably made of or plated with a metal of low work function such as silver, gold or copper. The anodes are preferably made of or plated with a metal of high work function such as platinium or stainless steel. Alternatively, the cathode may be made of solid material such as quartz with the surface facing the chamber 13 covered with a silver grid or with a uniform metal film of a density such as to transmit a portion of the incident light. The detector may be connected in a circuit (Fig. 3) in which the cathode 18 is connected through a load resistor 31 and voltage source 30 to earth, and the anode 22 is connected to an electrometer amplifier 32 having an output resistor 33 feeding a voltage recorder 34. The anode 21 is removed from the chamber 13 and the opening plugged. With the source 30 adjusted to a low value analysis of halogenated compounds, certain pesticides and herbicides, and other materials which show affinity for low voltage electrons may be effected by electron capture detection using nitrogen as a carrier gas. With a higher value of source 30, hydrocarbons and other organic compounds may be analyzed by ionization detection, using argon as a carrier. By employing anode 21 connected in parallel with anode 22, and connecting amplifier 32 as a voltmeter, Fig. 4 (not shown), breakdown voltage detection may be utilized in the measurement of H 2 , O 2 , N 2 and CO in helium carrier gas. In further modes of operation, a rectified A. C. supply is employed to detect diatomic and polyatomic gases such as nitrogen and propane in argon and helium carriers, or the electron energy spectrum of a sample is measured by varying the supply voltage over the electron capture range sufficiently rapidly to complete a cycle during the presence of a particular constituent in the chamber. A double cell form of detector, Fig. 2 (not shown), utilizes identical sample and reference chambers each having an apertured anode and cathode, and is connected in circuit arrangements, Figs. 5 and 6 (not shown), which either compensate for lamp output and amplifier operation, or vary the light intensity to keep the cell current constant. The light source 14 may be a mercury, hydrogen, xenon or other discharge lamp. The housings 10, 12 are preferably made of insulating material such as P. T. F. E., but may be of metal.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US259967A US3238367A (en) | 1963-02-20 | 1963-02-20 | Device for the analysis of a fluent material by bombarding the same with photoelectrons |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1057905A true GB1057905A (en) | 1967-02-08 |
Family
ID=22987234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6586/64A Expired GB1057905A (en) | 1963-02-20 | 1964-02-17 | Gas chromatograph detector |
Country Status (3)
Country | Link |
---|---|
US (1) | US3238367A (en) |
DE (1) | DE1215402B (en) |
GB (1) | GB1057905A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3608880A1 (en) * | 1985-03-15 | 1986-09-18 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland, Whitehall, London | THERMOELECTRON SOURCE |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3445757A (en) * | 1965-10-14 | 1969-05-20 | Mc Donnell Douglas Corp | Capillary ionization gas detector and analyzer using timed interval current fluctuations |
US3418514A (en) * | 1966-05-31 | 1968-12-24 | Beckman Instruments Inc | Electrical discharge detectors for gas chromatography |
US3649834A (en) * | 1970-10-06 | 1972-03-14 | Atomic Energy Commission | Laminar gas flow radiation detector |
US3649829A (en) * | 1970-10-06 | 1972-03-14 | Atomic Energy Commission | Laminar flow cell |
US4007624A (en) * | 1975-07-02 | 1977-02-15 | Westinghouse Electric Corporation | Electronegative gas detection technique |
GB8431663D0 (en) * | 1984-12-14 | 1985-01-30 | Perkin Elmer Corp | Ionization detector |
US4804846A (en) * | 1987-12-04 | 1989-02-14 | O. I. Corporation | Photoionization detector for gas chromatography |
US5153519A (en) * | 1991-02-28 | 1992-10-06 | Wentworth Wayne E | High voltage spark excitation and ionization detector system |
US5393979A (en) * | 1993-05-12 | 1995-02-28 | Rae Systems, Inc. | Photo-ionization detector for detecting volatile organic gases |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2582647A (en) * | 1949-01-04 | 1952-01-15 | Phillips Petroleum Co | Method and means for indicating changes in the composition of a gas |
US2641710A (en) * | 1951-03-02 | 1953-06-09 | Shell Dev | Radiological gas analysis |
US2901625A (en) * | 1956-01-05 | 1959-08-25 | Friedman Herbert | Ultra-violet gas analysis |
US2977474A (en) * | 1956-08-31 | 1961-03-28 | Standard Oil Co | Hydrogen-carbon analyzer |
US2950387A (en) * | 1957-08-16 | 1960-08-23 | Bell & Howell Co | Gas analysis |
GB919208A (en) * | 1958-09-12 | 1963-02-20 | Nat Res Dev | Improvements in or relating to the detection and/or analysis of low concentrations of gases and vapours |
DE1092235B (en) * | 1959-02-02 | 1960-11-03 | Honeywell Regulator Co | Device for tracking down or measuring the content of flammable components in gases |
US3047718A (en) * | 1959-11-24 | 1962-07-31 | Gen Electric | Negative ion generator |
US3043977A (en) * | 1960-03-30 | 1962-07-10 | Puritron Corp | Device and method for producing negative ions |
NL267344A (en) * | 1961-01-23 |
-
1963
- 1963-02-20 US US259967A patent/US3238367A/en not_active Expired - Lifetime
-
1964
- 1964-02-17 GB GB6586/64A patent/GB1057905A/en not_active Expired
- 1964-02-20 DE DEB75514A patent/DE1215402B/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3608880A1 (en) * | 1985-03-15 | 1986-09-18 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland, Whitehall, London | THERMOELECTRON SOURCE |
GB2173635A (en) * | 1985-03-15 | 1986-10-15 | Secr Defence | Photoemissive electron source |
GB2173635B (en) * | 1985-03-15 | 1989-11-01 | Secr Defence | An electron capture detector |
Also Published As
Publication number | Publication date |
---|---|
DE1215402B (en) | 1966-04-28 |
US3238367A (en) | 1966-03-01 |
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