<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Groundwater Degassing and Separation of Argon from Air for 39Ar Dating with ATTA"^^ . "A setup for water degassing employing a commercial membrane contactor with high maximum water flow rate (183L/min) and a setup for argon separation from air were developed, with the aim of dating groundwaters of intermediate age with 39Ar, using atom trap trace analysis (ATTA). For the degassing setup, degassing efficiencies for different elements and isotopes were determined (around 88% for oxygen, 84% for helium, 87% for neon, 90% for argon, 87% for krypton, and 82% for xenon). The setup for argon separation is similar to the one constructed by Riedmann [2011] and consists mainly of nine gas chromatographic columns installed in parallel and filled with zeolite Li-LSX as selective adsorbent, and a quadrupole mass spectrometer to observe the composition of the gas leaving the columns. Samples of more than 63LSTP air can be separated in one run. The argon separation strongly depends on temperature, with temperatures between -130 and -135°C being the most favorable. Argon purities ranging from 98 to\r\n99.6% and argon recoveries between 96.5 and 99.2% are achieved. Isotope fractionation during degassing and separation, which could change the39Ar/40Ar ratio and hence distort the 39Ar age, is negligible. First samples were taken in the field, separated, and dated with ATTA."^^ . "2013" . . . . . . . "Thomas"^^ . "Reichel"^^ . "Thomas Reichel"^^ . . . . . . "Groundwater Degassing and Separation of Argon from Air for 39Ar Dating with ATTA (PDF)"^^ . . . "Reichel_Diss_v130513.pdf"^^ . . . "Groundwater Degassing and Separation of Argon from Air for 39Ar Dating with ATTA (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Groundwater Degassing and Separation of Argon from Air for 39Ar Dating with ATTA (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Groundwater Degassing and Separation of Argon from Air for 39Ar Dating with ATTA (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Groundwater Degassing and Separation of Argon from Air for 39Ar Dating with ATTA (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Groundwater Degassing and Separation of Argon from Air for 39Ar Dating with ATTA (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #15307 \n\nGroundwater Degassing and Separation of Argon from Air for 39Ar Dating with ATTA\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .