EPA Method 507 - Performance Check Solution Back Catalog number: 19130 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59395 Metals Mix #1 Price on request 59503 Cations Mix Price on request 682110 (-)-delta-9-Tetrahydrocannabinol-C3, 10.0 µg/ml, Price on request