EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1692.12-100-TX5 2-Fluorodibenzothiophene, 100µg/mL, Solvent-toluene, Unit 1mL, # of units-5, Cas.no. 177586-38-8 Price on request 83597 EPA Method 515.2 Analytes - Underivatized Price on request 72207 Metformin, 1000μg/ml in MeOH, 1ml Price on request