EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended C12253700 7,9-Di-tert-butyl-1-oxaspiro[4,5]deca-6,9-die ne-2,8-dione, 25mg Price on request 673282 Fenazaquin, 10.0 µg/ml, Acetonitrile, 10ml Price on request 8399.4-10MG Desphenyl chloridazon-15N2, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. Price on request