EPA Method 1657 Analytes Back Catalog number: 31784 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 18000-0037-100AN5 Allopurinol, 100µg/ml in Acetonitrile, 5ml Price on request 674259 Halfenprox, 10mg Price on request 673997 Bentazone, 10.0 µg/ml, Acetonitrile, 10ml Price on request