EPA Method 418.1 - TPH IR Standard Back Catalog number: 98245 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673339 Linuron, 100 µg/ml, Acetonitrile, 5ml Price on request 680172 Isobutylparaben, 100mg Price on request 681707 Methotrexate hydrate, 100mg Price on request