EPA Method 500 Series Internal Standard #5 Back Catalog number: 30004 Manufacturer: ABSOLUTE STANDARDS Availability: 3 weeks Price on request - + Recommended 2065.6-K-IP 2,5-Dichlorophenol, 1000µg/mL, Solvent-isopropanol, Unit 1mL, # of units-1, Cas.no. 583-78-8 Price on request 71493 Quinoxaline-2-carboxylic acid Price on request 54357 WP Magnesium (Mg) Price on request