EPA Method 525 Internals & Surrogates Back Catalog number: 95227 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended C15106500 1-Methyl-3-nitroguanidine, certified, 0.1g Price on request MAHCH a-1,2,3,4,5,6-Hexachloro(13C6)cyclohexane, 1.2mL x 100ug/mL, nonane Price on request 72733 Bromopentafluorobenzene Price on request