2. ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction columns vs. disks

3. Columns vs. Disks

4. Forms of SPE Disks Solid Phase Extraction Disks (SPEDs) v Teflon Disks v Glass Fiber Disks v Laminar Disks

5. Glass vs. PTFE Disks EMPORE Disks (3M) ä sorbent particles are bound in a web of inert micro-PTFE fibrils ä can become clogged; wrinkle easily SPEC Disks (Ansys) ä porous glass fiber matrix ä thick, rigid; self-filtering

6. Glass vs. PTFE Disks (cont.) Processing Times for High Particulate Samples

7. SPE Tubes vs. Rigid Disks

8. Minimum Elution Volume 1 g sorbent 2.5 mL 47 mm 4.4 mL (2 mm solvent depth)

9. Large Volume Samples Sample size: 1 liter Analytes: EPA 525.1compounds Elution Volume : Packed Bed Disk (mL) 2 x 2 2x5

10. Glass Filtration Apparatus Disk

11. PTFE Disk Holder