EPA Method 515.1 Internal Standard Back Catalog number: 30023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 70660 Diquat, 1000µg/ml in Water, 1ml Price on request 675933 D5-Propachlor ESA sodium salt, 5mg Price on request 30441R Baygon Price on request