EPA Method 524 & 624 - Internal Standard Back Catalog number: 19794 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2586.30-K-IO m-Quinquiphenyl, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 16716-13-5 Price on request 672983 Estriol, 100mg Price on request 676685 Ethofumesate-2-keto, 100 µg/ml, Cyclohexane, 1ml Price on request