EPA Method 608 Pesticides Back Catalog number: 81801 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended L-PFBS Potassium perfluoro-1-butanesulfonate, 1.2ml x 50ug/ml, methanol Price on request 56024 Chromium (Cr) Price on request 58027 Cobalt (Co) Price on request