EPA Method 8141 Surrogate Standard Back Catalog number: 92387 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 56055 Cesium (Cs) Price on request 52095 Alternate Metals Kit Price on request