EPA Method 525 Internals & Surrogates Back Catalog number: 95227 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended R508000 Rifampicin, 500mg Price on request 681881 2,3,6-Trichloroanisole, 100 µg/ml, Ethyl acetate, Price on request 70629 DEF Price on request