EPA Method 507/1656 Nitrogen Phosphorus Back Catalog number: 31782 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 66166 2,3,4,4',5,6-Hexachlorobiphenyl (166) Price on request 1077.17-K-IO n-Undecylbenzene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 6742-54-7 Price on request M3PFHXS Sodium perfluoro-1-[1,2,3-13C3]hexanesulfonate, 1.2ml x 50ug/ml, methanol Price on request