Multibed Needle Trap Devices for on Site Sampling and Preconcentration of Volatile Breath Biomarkers

To facilitate their use in trace gas analysis, the adsorption capacity of needle trap devices (NTDs) was increased by combining three adsorbent materials and increasing total adsorbent amount. The use of 22 gauge needles, application of internally expanding desorptive flow technique without cryofocu...

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