charcoal tube

https://doi.org/10.1351/goldbook.10168
Tube filled with charcoal typically used to adsorb analytes from the gas or liquid phase.
Note: Activated charcoal was used in early applications, but a wider selection of carbon materials are currently used, with properties tailored to each application.
Source:
PAC, 2016, 88, 517. (Glossary of terms used in extraction (IUPAC Recommendations 2016)) on page 521 [Terms] [Paper]