US3873205A - Assembly for use in atomic absorption spectroscopy - Google Patents

Assembly for use in atomic absorption spectroscopy Download PDF

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Publication number
US3873205A
US3873205A US403115A US40311573A US3873205A US 3873205 A US3873205 A US 3873205A US 403115 A US403115 A US 403115A US 40311573 A US40311573 A US 40311573A US 3873205 A US3873205 A US 3873205A
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United States
Prior art keywords
pillars
vapour source
atomic vapour
carbon rod
atomic
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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 - Lifetime
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US403115A
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English (en)
Inventor
Kenneth Clive Thompson
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Shandon Southern Instruments Ltd
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Shandon Southern Instruments Ltd
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Publication date
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
    • G01N21/74—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited using flameless atomising, e.g. graphite furnaces

Definitions

  • ABSTRACT An atomic vapour source which includes two spaced metal pillars clamped between but electrically insulated from two plates defining a chamber therebetween, each pillar being adapted at one end to be clamped to one end of carbon rod extending between the ends of the two pillars, the clamping ends of the pillars being free to move relative to one another to permit expansion and contraction of the carbon rod when heated and cooled.
  • the present invention consists in an atomic vapour source which includes two sapced metal pillars clamped between but electrically insulated from two plates defining a chamber therebetween, each pillar being adapted at one end to be clamped to one end of a carbon rod extending between the ends of the two pillars, the clamping ends of the pillars being free to move relative to one another to permit expansion and contraction of the carbon rod when heated and cooled.
  • FIG. 1 is a general view ofone form of atomic vapour spaced to the present invention.
  • FIGS. 2 and 3 show two alternative forms of carbon rod for use in the apparatus of FIG. 1.
  • an atomic vapour source includes two spaced vertical metal pillars 11 fixed at their bottom ends to an electrically insulating cross bar 12.
  • the two pillars 11 are clamped between two metal side plates 13 by means of a bolt 14 so as to define an enclosure or chamber between the pillars 11, the pillars being electrically insulated from the plates by strips 14 of electrically insulating material such as Teflon strip. Plates 13 are also fixed to a support column 15 by means of bolts 16.
  • Each pillar 11 is provided with a slit 17 and a horizontal bore in which is clamped one end of a carbon rod 18 by means of screws 19.
  • FIGS 2 and 3 show portions of two alternative forms of carbon rod 18 each of which is provided with a hollowed out cavity 19' and two cut-away portions 20 underneath the rods so that when an electric current is passed through the rod, heating of the rod will be concentrated around cavity 19 and to each side thereof for a distance sufficient to minimise memory effects.
  • both pillars 11 are electrically insulated from the rest of the structure, an electrical current may be passed through the rod 18 by means of terminals 21 at the bottom ends of the pillars l1, and since the upper ends of the pillars are not directly fixed in relation to one another linear expansion of the rod 18 when heated up rapidly by the current may be taken up by slight movement apart of the upper ends of the pillars 11 as permitted by flexing of the cross bar 12. In use temperature rises of up to 3000C in one-half sec. may be encountered.
  • a conduit 22 is provided for introducing an inert gas such as nitrogen or argon into the lower part of the enclosure between pillars 11, which part may be filled with glass beads or some suitable mesh arrangement to diffuse the gas flow.
  • the pillars 11 are arranged to be cooled by means of cooling fluid passing through bores 23 in the pillars, interconnected by conduit 24 and having an inlet 25 and outlet 26.
  • the apparatus is provided with a mask or yoke 27 movable about a pivoted connection 28 to the plate 13 (but insulated from pillars 11) by means of adjusting nut 29 acting against compression springs 35 so that either apertures 30 or apertures 31 of different size in mask 27 may be brought into alignment with apertures 32 in plates 13 as desired.
  • a small quantity of sample solution is dropped into cavity 19' in the rod 18 and a cover 33 is provided with a venting chimney fitted across the upper margins of plates 13.
  • a small current is then passed through the rod 18 to drive off solvent, then a larger current can be used to drive off organic matter, if present, and then finally a still larger current is passed through the rod to create a region of atomic vapour of the sample above the rod.
  • Radiation is directed through this region via apertures 32 and either apertures 30 or 31 to permit atomic absorption measurements to be effected.
  • Apertures 34 are provided in the sides ofthe pillar 11 to permit radiation to be directed longitudinally of the rod 18, with a corresponding aperture in the end portion 27a of the yokr 27.
  • An atomic vapour source which includes two spaced metal pillars clamped between but electrically insulated from two plates defining a chamber therebetween, each pillar being adapted at one end to be clamped to one end ofa carbon rod extending between the ends of the two pillars, the clamping ends of the pillars being free to move relative to one another to perniit expansion and contraction of the carbon rod when heated and cooled, said carbon rod provided with means for receiving a sample to be observed, means for directing radiation towards said sample, and means for effecting atomic absorption measurements.
  • the pillars are electrically insulated from the plates by means of strips of electrically insulating material.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
US403115A 1972-10-23 1973-10-03 Assembly for use in atomic absorption spectroscopy Expired - Lifetime US3873205A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4867172A GB1410242A (en) 1972-10-23 1972-10-23 Atomic vapour sources

Publications (1)

Publication Number Publication Date
US3873205A true US3873205A (en) 1975-03-25

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US403115A Expired - Lifetime US3873205A (en) 1972-10-23 1973-10-03 Assembly for use in atomic absorption spectroscopy

Country Status (5)

Country Link
US (1) US3873205A (fr)
DE (1) DE2350055A1 (fr)
FR (1) FR2203973B3 (fr)
GB (1) GB1410242A (fr)
IT (1) IT995678B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957374A (en) * 1974-02-01 1976-05-18 Carl Zeiss-Stiftung Apparatus for obtaining samples of dusts for analysis by spectrochemical examination
US4653913A (en) * 1984-07-28 1987-03-31 U.S. Philips Corporation Heating device for an atomic absorption spectrometer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702219A (en) * 1970-02-11 1972-11-07 Bodenseewerk Perkin Elmer Co Graphite tube cell assemblies for atomic absorption spectrometers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702219A (en) * 1970-02-11 1972-11-07 Bodenseewerk Perkin Elmer Co Graphite tube cell assemblies for atomic absorption spectrometers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957374A (en) * 1974-02-01 1976-05-18 Carl Zeiss-Stiftung Apparatus for obtaining samples of dusts for analysis by spectrochemical examination
US4653913A (en) * 1984-07-28 1987-03-31 U.S. Philips Corporation Heating device for an atomic absorption spectrometer

Also Published As

Publication number Publication date
DE2350055A1 (de) 1974-05-09
IT995678B (it) 1975-11-20
FR2203973A1 (fr) 1974-05-17
FR2203973B3 (fr) 1976-09-17
GB1410242A (en) 1975-10-15

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