EPA Method 525 Internals & Surrogates Back Catalog number: 95227 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71244 Methyl paraoxon, 1000µg/ml in MeOH, 1ml Price on request 678272 Chlorbenside, 100 µg/ml, Acetonitrile, 5ml Price on request 70204 p-Isopropyl toluene Price on request