EPA Method 525 Internals & Surrogates Back Catalog number: 91161 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59339 Perchlorate Level 1 Price on request 71806 Acetic acid, 1000µg/ml in Water, 1ml Price on request 99399 PAH Mix, 18 anal., 100µg/ml in Acetonitrile, 1ml Price on request