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2. Diffusion and/or fusion extraction
All the techniques described below are designed to extract rare gases, whether trapped in fluid inclusions or in the crystalline structure of rocks.
The principle of extraction is based on heating (destructive or non-destructive, depending on the case) of the sample, and its mechanism relies on the diffusion of gases through a solid medium (mineral, rock) or liquid when the melting point has been reached. The systems described are based on resistive, inductive or radiant heating and are used to determine the contents and isotopic ratios of noble gases in a sample.
These techniques can be found in most laboratories, especially in geochemistry, and have become essential tools for carrying out projects in fields as varied as cosmochemistry, geochronology, climatology, tectonics, etc.
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Unit operations. Chemical reaction engineering
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Diffusion and/or fusion extraction
UV laser ablation extraction
Bibliography
Events
Development In Noble Gas Understanding and Expertise (DINGUE). Workshop organized each year in conjunction with the GOLDSCHIMDT conference.
Standards and norms
- CF flange connection elements: the elements are made of 316 L stainless steel [DIN 17 440 – WN 14 404) Z2CND17-12] and DIN 28 403 - « Pneurop » 6601 - 1981
- Cuivre OFHC (Oxygen Free High Conductivity ): Cuivre élaboré suivant une méthode américaine. Son équivalent français est le cuivre Cu-c1 ou 2 - ISO431 -
Patents
ZIMMERMANN (L.), PIK (R.). – High-temperature furnace under ultra-high vacuum. [patent FR 2973105(A1)] (2011).
ZIMMERMANN (L.). – Furnace and process for extraction by diffusion of helium present in minerals. [patent no. 1 000185860] (2013).
Directory
Manufacturers – Producers – Suppliers (non-exhaustive list)
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Ultra-high vacuum equipment (CF flange, translation and electrical bushing, copper gasket, etc.)
Adixen Vacuum Products SAS (Pfeiffer) http://www.pfeiffer-vacuum.com
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