EPA Method 515.3 - Derivatized acids Back Catalog number: 30151 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 0545.27-100-IO 22,29,30-Trisnor-17 alpha(H)-hopan-21-one, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 1172-78-7 Price on request 682003 2,5-Dichlorohydroquinone, 50mg Price on request 2641.40-10MG ßß-Carotene, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 7235-40-7 Price on request