EPA Method 531.1 - Analytes

Salicylic acid-d4 (3,4,5,6-d4), 100µg/mL, Solvent-methanol, Unit 1mL, # of units-10, Cas.no. 7864-17-0

O,O-Diethylthiophosphate-13C2, sodium salt, 100µg/ml in MeOH, 1ml

2,2'-Methylenedianiline, 25mg