EPA Method 624 Internal / Surrogate Standard

2-Hydroxy-9,10-anthraquinone, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 605-32-3

2,6-Dichlorobenzonitrile, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 1194-65-6

Formic acid, 1000µg/ml in Water, 1ml