EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 679150 13C, 15N2-Semicarbazide hydrochloride, 10mg Price on request DF-267-S 2,6,7-Trichlorodibenzofuran, 1.2ml x 50ug/ml, toluene Price on request 2514.7-K-ME 4-Hydroxybenzoic acid, 1000µg/mL in MeOH, 1ml Price on request