Sorbent Tube, Silica Gel, treated w/methyl p-tolyl sulfoxide (MTSO), 8 x 110-mm size, 2 sections, 800/200 mg sorbent, 20/40 mesh 226-199-UC

Sorbent Tube, Silica Gel, treated w/methyl p-tolyl sulfoxide (MTSO), 8 x 110-mm size, 2 sections, 800/200 mg sorbent, 20/40 mesh 226-199-UC