Sorbent Tube, Silica Gel, treated w/ o-phenylenediamine, 8 x 110-mm size, 2 sections, 520/260 mg sorbent, 20/40 mesh 226-191

Sorbent Tube, Silica Gel, treated w/ o-phenylenediamine, 8 x 110-mm size, 2 sections, 520/260 mg sorbent, 20/40 mesh 226-191