EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended PCB-SCS-H Mass-Labelled PCB Cleanup/Sampling Standards, 1.2ml, nonane Price on request 34241 n-Butylcyclohexane Price on request 91703 EPA Method 502.2 Internal Standard Price on request