EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 70724 Lenacil, 1000µg/ml in Acetone, 1ml Price on request 93189 Semi-Volatile Standard Price on request 681125 D10-Diphenylamine, 10mg Price on request