EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 67017 beta-Lactam Antibiotics Price on request 677811 D10-1-Butanol, 100 µg/ml, Acetonitrile, 1ml Price on request 8805.4-1ML 3-(Methylthio)-1-propanol, neat, Solvent-neat, Unit 1mL, # of units-1, Cas.no. 505-10-2 Price on request