EPA Method 502.2 Internal Standard Back Catalog number: 91703 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-IS-J20 Mass-Labelled PCDD Internal Standard Solution, 1.2ml, nonane Price on request 9423.18-50MG Methyl heptadecanoate-d33, neat, Solvent-neat, Unit 50mg, # of units-1, Cas.no. 1219804-81-5 Price on request 59500 Anions Mix Price on request