EPA Method 525 Internals & Surrogates Back Catalog number: 95227 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10200.21-5MG (-)-delta-9-THC-13C4, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. Price on request 92974 Surrogate Standard Price on request S-4422-40-4.5PE ISO 9377-2 MOD Extraction Solvent Stock Solution II 40µg/mL of each Units: 1x100mL and 5x100mL extraction solvent stock solution n-Heptane 40mg n-Tetracontane 40mg Pentane Add to 1000mL Price on request