EPA Method 555 Herbicide Standard Back Catalog number: 83600 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-IS-E Mass-Labelled PCDF Internal Standard Solution, 1.2ml, nonane Price on request 3105.12-50-IO 3,3',5,5'-Tetrabromobiphenyl, 50µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 16400-50-3 Price on request 3593.55-5MG Chlorophyll A Price on request