EPA Method 525 Internals & Surrogates Back Catalog number: 95227 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673841 Trinexapac, 10.0 µg/ml, Acetonitrile, 10ml Price on request 71891 1,2,3,4-Tetrahydronaphthalene Price on request 677940 Di-n-heptyltin dichloride, 100mg Price on request