EPA Method 524 & 624 - Internal Standard Back Catalog number: 19494 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended L429-AS Method 429 Alternate Standard Stock Solution, 1.2ml, isooctane Price on request 71642 Isopropyl sulfide Price on request 8397.9-100-ME Pinic acid, 100µg/mL, Solvent-Methanol, Unit 1mL, # of units-1, Cas.no. 473-73-4 Price on request