EPA Method 8260B Purgeable Internal Standard

5-Chloro-2-(2,4-dichloro[13C6]phenoxy)[13C6]phenol, 1.2ml x 50ug/ml, nonane

Thiazafluron, 100 µg/ml, Acetonitrile, 1ml

1,8-Dimethylnaphthalene, 1000µg/ml in MeOH, 1ml