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- W796586918 abstract "An acid reaction and air mixing station (ARAMIS) is described which is capable to introduce CO2 at ambient levels into an air mixture (without CO2) at the precision level required for air monitoring of the CO2 isotopes. The mixing station is used for generating CO2 by a conventional acid reaction (at 47°C carbonate powder is reacted with pure ortho-phosphoric acid) and mixing the reaction gas with synthetic air. The mixture is distributed into a number of glass flasks (5l volume, 1.6 bar) attached to the system. The isotopic composition was recovered by measurement of the flask air samples using the two automated cryogenic extraction line / mass spectrometer systems in the Jena isotope facility. Using the same protocol we have generated CO2-in-air mixtures from NBS-19 and other internationally available carbonate standards for assigning isotopic values to our new carbonate reference material (MAR-J1). The isotopic record in a number of batches prepared over the course of several months is presented. In addition, the relationship with existing CO2-in-air scales (e.g. CG-99, based on calibration of pure CO2 gas) has been evaluated by direct CO2 admixture to synthetic air using the same setup." @default.
- W796586918 created "2016-06-24" @default.
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- W796586918 date "2005-01-01" @default.
- W796586918 modified "2023-09-27" @default.
- W796586918 title "Isotopic analysis of CO2 in air samples: Requirements for a new CO2-in- air standard and preparation of an air-CO2 reference mixture from calcite material" @default.
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