EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10675.8-1ML Di(ethylene glycol)butyl ether Price on request 12102.2-25MG HEPA,neat,neat,25mg, Price on request 15185.21-K-ME (±)-trans-Hexahydrocannabinol, 1000µg/ml in MeOH, 1ml Price on request