EPA Method 8330 Analyte

(2RS)-2-(4-Ethylphenyl)propanoic acid, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 3585-52-2

Nortriptyline-d3 hydrochloride (N-methyl-d3)

Sodium p-n-tridecylbenzenesulfonate, 10mg