EP3523632A1 - Sample holder device for an atomization furnace, and manufacturing method - Google Patents
Sample holder device for an atomization furnace, and manufacturing methodInfo
- Publication number
- EP3523632A1 EP3523632A1 EP17788117.4A EP17788117A EP3523632A1 EP 3523632 A1 EP3523632 A1 EP 3523632A1 EP 17788117 A EP17788117 A EP 17788117A EP 3523632 A1 EP3523632 A1 EP 3523632A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- graphite
- sample carrier
- carrier device
- sample
- pyrolytic carbon
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- the invention relates to a sample carrier device for an atomizing oven of an analyzer and an analyzer, in particular for atomic absorption spectrometry, and a method for producing a sample carrier, wherein the sample carrier device has a receiving tube which forms a tubular receiving space for receiving an analyte, wherein the sample carrier device completely is formed of graphite.
- Atomizing furnaces for atomic absorption spectrometry (AAS), in particular for graphite furnace atomic absorption spectrometry (GF-AAS), are well known, and for the atomization of an analyte, a graphite furnace or a graphite tube is heated electrothermally.
- the graphite furnace or a tube furnace device regularly has a sample carrier device with a receiving space, which is tubular. Within the tubular receiving space, the analyte can be atomized directly in the receiving space or on an exemplary dish-shaped platform in the receiving space.
- For optical spectral analysis are the longitudinal ends of the tubular receiving space Always open.
- the tubular receiving space is formed by a receiving tube of the sample support device made of graphite.
- the receiving space or the receiving tube can be heated longitudinally or transversely. That is, a heating current may flow from longitudinal ends of the pickup tube along a length of the pickup tube, or the pickup tube may be electrically contacted via bearing extensions opposite its shell, such that a current flows therethrough transversely to a longitudinal axis of the pickup tube.
- the bearing extensions are then held in a bearing device of a tube furnace device of the analyzer and electrically contacted.
- sample carriers are known, which are adapted to the respective atomizing furnace.
- an atomizing furnace or a sample carrier device is known, in which a sample carrier within a
- Sample support device is arranged and selectively supported on three or four support projections on a wall of the sample support device. Since the sample carrier device for electrical contacting is always clamped or clamped between bearings of the atomizing furnace, a clamping force is exerted on the sample carrier device.
- the known sample carrier device are due to their geometric shape by machining only consuming to produce graphite.
- the graphite is usually electrogra phite, which is available in the form of a semifinished product, for example in block form.
- it may be provided to recompress the semifinished product or the graphite block.
- the graphite block is impregnated with highly carbonaceous liquids, such as resin, tar or pitch, and then carbonized and graphitized. In this case, only a very small part of the carbonaceous liquid is actually converted into carbon, which accumulates within pores of the graphite block. These so-called post-compaction can be performed repeatedly to obtain a desired density and strength of the semifinished product.
- the present invention is therefore based on the object to propose a method for manufacturing and a sample carrier device with a prolonged service life.
- the sample support device has a receiving tube, which forms a tubular receiving space for receiving an analyte, wherein the sample support device is formed entirely from graphite, wherein the graphite the sample holder is infiltrated with pyrolytic carbon.
- the sample support device is formed entirely from graphite, wherein the graphite the sample holder is infiltrated with pyrolytic carbon.
- the binder bridges can be protected by the infiltration of the sample carrier device or the graphite of the sample carrier device with pyrolytic carbon.
- the pyrolytic carbon has a high electrical conductivity and thereby relieves the relatively relatively high impedance binder bridges.
- a completed shape of the sample support device can be formed by machining a semifinished product made of graphite. That is, it can be provided that the sample support device is machined at least partially or completely from a graphite block as a semi-finished by machining and only after the formation of the shape of the sample support means it is infiltrated with pyrolytic carbon. This makes it possible to infiltrate the sample carrier device comparatively quickly and with a low cost of materials.
- a completed shape of the sample support means may be formed by machining the semifinished graphite product. Accordingly, it may initially be provided to infiltrate the semifinished product of graphite or a graphite block before a machining with pyrolytic carbon.
- a particularly uniform distribution of pyrolytic carbon within the sample carrier device can be achieved.
- the graphite semi-finished product may be formed by mixing a carbonaceous powder with a binder, followed by densification and heat treatment.
- a block of electrographite can be formed.
- the block of electrographite may have a porosity that allows infiltration with pyrolytic carbon.
- adjacent grains in the graphite may be at least partially coated with the pyrolytic carbon.
- the adjacent or adjoining and interconnected via binder bridges grains can be coated so that the binder bridges are also coated with the pyrolytic carbon.
- pores in the graphite of the sample carrier can be at least partially closed or filled with the pyrolytic carbon. Already by filling the pores, a sample carrier of high density and strength is obtained.
- the entire sample rack can be infiltrated with pyrolytic carbon. Accordingly, not only an infiltration layer can be formed, but the pyrolytic carbon completely permeates the graphite of the sample support, so that the pyrolytic carbon is within the entire sample carrier.
- the infiltration of the graphite of the sample carrier device by means of a CVI method (chemical vapor infiltration) take place.
- the sample carrier device may be provided to coat the sample carrier device with a surface layer of pyrolytic carbon.
- a surface of a body of the sample carrier device can be provided with a supplementary surface layer applied to the surface, which covers and closes the pores and the graphite of the sample carrier device.
- the coating then consists of pyrolytic carbon or of pyrolytic graphite, since it is then essentially the same material as the material used for infiltration. It is also possible to fix components of the sample carrier device, which may be formed in one piece but also in several parts, by pyrolytic coating to each other.
- the coating of the sample carrier device can preferably be carried out by means of a CVD method (chemical vapor deposition). For example, it may be provided to first apply a CVI method and subsequently the CVD method.
- CVD method chemical vapor deposition
- first process section at a first temperature and subsequently the coating within a second process section at a second temperature during a process duration of an infiltration or coating of the sample support device
- first process section being longer than the first process section second process section
- first temperature may be lower than the second temperature selected.
- first one Infiltration of a body or component of the sample support device with pyrolytic carbon perform the infiltration can then be carried out over a relatively long process period at low process temperature advantageous.
- An outer coating of a surface of the sample carrier device or its parts can subsequently be applied by increasing the process temperature to the second temperature level.
- the then executed, second process section at the elevated process temperature can then run comparatively shorter.
- an infiltration with a subsequent surface coating with pyrolytic carbon could thus easily take place within an uninterrupted coating process.
- the sample support device according to the invention for an atomizing furnace, in particular for atomic absorption spectrometry has a receiving tube which forms a tubular receiving space for receiving an analyte, wherein the sample support device is formed entirely from graphite, wherein the graphite of the sample support device is infiltrated with pyrolytic carbon ,
- the sample carrier device may have a porosity of ⁇ 5%, preferably ⁇ 1%, and particularly preferably of 0%. With a porosity of substantially 0%, the sample carrier device can be formed with a particularly high density and strength. Further advantageous embodiments of a sample support device emerge from the feature descriptions of the dependent claims on the method claim 1.
- the analyzer according to the invention in particular for atomic absorption spectrometry, comprises an atomizing furnace, the atomizing furnace having a sample carrier device according to the invention.
- the analyzer may include a tube furnace apparatus having a bearing means for supporting and electrically contacting the sample support means, wherein the tube furnace apparatus may be formed of graphite, wherein the graphite of the tube furnace apparatus may be infiltrated with pyrolytic carbon.
- the tube furnace apparatus may be made like the sample holder.
- the tube furnace device may then comprise a bearing device for holding and electrically contacting the sample carrier device.
- the bearing device can have two bearing receptacles, which in each case can be assigned to a bearing extension of the sample carrier device.
- the sample carrier device can then be held on the bearing receptacles of the bearing device and electrically contacted.
- the bearing device or the bearing receptacles are then likewise made of graphite, wherein the bearing device can also be infiltrated with pyrolytic carbon.
- the sample carrier device can form the tube furnace device, so that then the sample carrier device can be held directly in a bearing device of an atomizing furnace and electrically contacted.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016219492.5A DE102016219492A1 (en) | 2016-10-07 | 2016-10-07 | Sample carrier for an atomizing furnace and method of manufacture |
PCT/EP2017/074530 WO2018065276A1 (en) | 2016-10-07 | 2017-09-27 | Sample holder device for an atomization furnace, and manufacturing method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3523632A1 true EP3523632A1 (en) | 2019-08-14 |
Family
ID=60164641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17788117.4A Withdrawn EP3523632A1 (en) | 2016-10-07 | 2017-09-27 | Sample holder device for an atomization furnace, and manufacturing method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3523632A1 (en) |
CN (1) | CN109791110A (en) |
DE (1) | DE102016219492A1 (en) |
WO (1) | WO2018065276A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017214861B4 (en) * | 2017-08-24 | 2022-02-24 | Schunk Kohlenstofftechnik Gmbh | tube furnace device |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2420546A1 (en) * | 1974-04-27 | 1975-11-06 | Bodenseewerk Perkin Elmer Co | Graphite tubes for flameless atomic absorption spectroscopy - impregnated with coal tar to seal pores and cracks |
DE2702189C2 (en) * | 1977-01-20 | 1985-05-30 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Cell for flameless atomic absorption spectroscopy |
AU4527079A (en) * | 1978-03-21 | 1979-09-27 | South African Inventions Development, The | Electrothermal atomization |
BG27674A1 (en) * | 1978-11-06 | 1984-12-16 | Khavezov | Atomic absorbtion non- flame method for determining phosphor in graphite furnace |
DE3010717A1 (en) * | 1980-03-20 | 1981-10-15 | Bodenseewerk Perkin-Elmer & Co GmbH, 7770 Überlingen | METHOD FOR PRODUCING COATED GRAPHITE TUBES FOR THE ATOMIC ABSORPTION SPECTROSCOPY |
DE3416421A1 (en) * | 1984-05-04 | 1985-11-07 | Philips Patentverwaltung Gmbh, 2000 Hamburg | SAMPLE CARRIER FOR THE FLAMELESS ATOMIC ABSORPTION AND EMISSION SPECTROSCOPY AND METHOD FOR THE PRODUCTION THEREOF |
JPS61239145A (en) * | 1985-04-16 | 1986-10-24 | Mitsubishi Pencil Co Ltd | Production of carbon furnace for atomic absorption analysis |
DD243086A1 (en) * | 1985-12-02 | 1987-02-18 | Elektrokohle Lichtenberg Veb | METHOD FOR HIGH TEMPERATURE TREATMENT OF CARBON OR GRAPHITE PRODUCTS IN AN INDUCTION OVEN |
DD299924A7 (en) * | 1986-04-11 | 1992-05-14 | Elektrokohle Lichtenberg Ag,De | GRAPHITE PIPE CUVET WITH A COAT OF PYROCARBON AND METHOD FOR THE PRODUCTION THEREOF |
JPS63175745A (en) * | 1987-01-16 | 1988-07-20 | Mitsubishi Pencil Co Ltd | Production of carbon furnace for atomic absorption analysis |
EP0312146B1 (en) * | 1987-10-15 | 1993-03-31 | Philips Patentverwaltung GmbH | Process for the production of shaped articles from pyrolitic graphite |
DE3923822C2 (en) * | 1989-07-19 | 1998-08-20 | Bodenseewerk Perkin Elmer Co | Furnace for the electrothermal atomization of samples for spectroscopic purposes and process for its manufacture |
DE4120028A1 (en) * | 1991-06-18 | 1992-12-24 | Ziegler Fritz Feinwerktech | GRAPHITE TUBES |
DE4223593A1 (en) * | 1992-07-17 | 1994-01-20 | Ringsdorff Werke Gmbh | Tube furnace with sample holder for electrothermal atomization |
DE4240934A1 (en) * | 1992-12-04 | 1994-06-09 | Bodenseewerk Perkin Elmer Co | Graphite furnace for the thermoelectric atomization of samples for atomic absorption spectroscopy |
DE4243767C2 (en) * | 1992-12-23 | 1996-06-05 | Zeiss Carl Jena Gmbh | Platform for a cross-heated, electrothermal atomizing furnace for atomic absorption spectroscopy |
CA2231548A1 (en) * | 1996-07-11 | 1998-01-22 | Klaus Eichardt | Longitudinally or transversely heated tubular atomising furnace |
DE19932874C2 (en) | 1999-07-16 | 2002-11-14 | Schunk Kohlenstofftechnik Gmbh | atomizing furnace |
DE602004010538T2 (en) * | 2004-12-15 | 2008-11-13 | Sgl Carbon Ag | Durable graphite bodies and process for their preparation |
CN102914504A (en) * | 2011-08-04 | 2013-02-06 | 上海原子科兴药业有限公司 | Method for measuring contents of strontium and aluminum in strontium chloride injection by graphite furnace atomic absorption spectrometry |
US9261306B2 (en) * | 2012-11-01 | 2016-02-16 | Schunk Kohlenstofftechnik Gmbh | Atomizing furnace |
DE202014011281U1 (en) * | 2014-11-21 | 2019-01-10 | Schunk Kohlenstofftechnik Gmbh | heat transfer element |
-
2016
- 2016-10-07 DE DE102016219492.5A patent/DE102016219492A1/en not_active Withdrawn
-
2017
- 2017-09-27 CN CN201780061622.7A patent/CN109791110A/en active Pending
- 2017-09-27 WO PCT/EP2017/074530 patent/WO2018065276A1/en unknown
- 2017-09-27 EP EP17788117.4A patent/EP3523632A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2018065276A1 (en) | 2018-04-12 |
CN109791110A (en) | 2019-05-21 |
DE102016219492A1 (en) | 2018-04-12 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: WELLER, STEFFEN Inventor name: GAERTNER, RALF Inventor name: SCHWARZ, INKA |
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Effective date: 20210401 |