EPA Method 507 - Performance Check Solution Back Catalog number: 19137 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79264 Bromoxynil Price on request 684690 D8-4,4'-DDD, 100 µg/ml, Acetone, 1ml Price on request 672969 Polymyxin B sulfate, 100mg Price on request