EPA Method 509 Internal Standard Back Catalog number: 30097 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 73517 Lactofen Price on request 0686.29-100-IO (24S)-24-Ethylcholesta-3,5,22-triene, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 102491-96-3 Price on request 3447.5-100-CY Methomyl Price on request