Developing a passive trap for diffusive atmospheric (CO2)-C-14 sampling

作者：Walker Jennifer C^*; Xu Xiaomei; Fahrni Simon M; Lupascu Massimo; Czimczik Claudia I

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2015, 361: 632-637.

DOI：10.1016/j.nimb.2015.05.030

• Radiocarbon
• C-14
• Passive atmospheric sampler
• Zeolite
• Molecular sieve

C-14-CO2 measurement is an unique tool to quantify source-based emissions of CO2 for both the urban and natural environments. Acquiring a sample that temporally integrates the atmospheric C-14-CO2 signature that allows for precise C-14 analysis is often necessary, but can require complex sampling devices, which can be difficult to deploy and maintain, especially for multiple locations. Here we describe our progress in developing a diffusive atmospheric CO2 molecular sieve trap, which requires no power to operate. We present results from various cleaning procedures, and rigorously tested for blank and memory effects. Traps were tested in the environment along-side conventional sampling flasks for accuracy. Results show that blank and memory effects can be minimized with thorough cleaning and by avoiding overheating, and that diffusively collected air samples agree well with traditionally canister-sampled air.

• 出版日期2015-10-15