| 摘要 |
A system (2) for the use in a process of gravimetric compositional determination by solvent extraction, the system comprising: a sample tube (4) for containing a sample having a component or components to be extracted, the sample tube (4) being formed with an elongate body portion (6) closable at one end (10) against egress of the sample; a piston (16) for releasable, slidable engagement with an internal surface (8) of the elongate body portion (6) and a multi-way valve (36) adapted to provide a selectable connection between an internal volume (14) of the sample tube (4) and two or more liquid reservoirs (42-47) containing liquids for use in the solvent extraction. |
