ASTM D-4815 Calibration Mix #4

4-Nonylphenol-di-ethoxylate, 50 µg/ml, Acetone,

2-Phenylbutyric acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 90-27-7

2-Methylindole, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 95-20-5