EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 90620 Methanol Price on request 0760.16-500-IO 1,2-Dimethylphenanthrene, 500µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 20291-72-9 Price on request 12495.16-250MG Amoxicillin trihydrate, 250mg Price on request