624B Internal / Surrogate Standard

N-(4-chloro[13C6]phenyl)-N'-(3,4-dichloro[13C6]phenyl)[13C]urea , 1.2ml x 50ug/ml, methanol

Sulfur in Isooctane - 0.001 Wt%

1,1-Dichloroethene, 2000µg/ml in MeOH, 1ml