EPA Method 515.1 Internal Standard Back Catalog number: 30023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3387.9-100-IO alpha-Endosulfan, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 959-98-8 Price on request 681698 2,4-Dicofol, 10.0 µg/ml, Isooctane, 1ml Price on request 95127 3 VOC Mix #2 Price on request