Fig. 1. Apparatus for batch filtration and solid phase extraction. The removable upper filtration assembly (a–d) includes: advancement nut and threaded guide rod (a), filter–plunger compression board (b), syringeless filters (c), and base (d). The lower column–bottle assembly (e–h) includes: column suspension board (e), solid phase extraction column (f), sample collection bottle (g), and base (h).