EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3382.12-100-AN Dioxathion Price on request 683713 Pretilachlor, 100 µg/ml, Acetonitrile, 5ml Price on request 673451 Thiabendazole, 100 µg/ml, Acetonitrile, 5ml Price on request