EPA Method 8121 Internal Standard Back Catalog number: 81203 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 684615 2-Butanone-2,4-DNPH, 100mg Price on request PFUDA Perfluoro-n-undecanoic acid, 1.2ml x 50ug/ml, methanol Price on request 678143 1,2,3-Trichlorobenzene, 1000mg Price on request