EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 681123 Dihydroergotamine mesylate, 50mg Price on request 678327 Ethalfluralin, 100 µg/ml, Acetonitrile, 5ml Price on request ACQ-AQ15-030 Ethanol standard in water,1.5g/L,water, 3mL Price on request