EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 91059 Triadimefon Price on request 681085 2-n-Octylphenol, 100 µg/ml, Acetone, 1ml Price on request 3496.12-100-AN Propyzamide Price on request