EPA Method 524.2 - Revision 4.0 Back Catalog number: 33001 Manufacturer: ABSOLUTE STANDARDS Availability: 3 weeks Price on request - + Recommended 677220 4-(3-Indolyl)-butyric acid, 250mg Price on request 50679 L(+)Lactic acid (C3H6O3) Price on request 673353 Methidathion, 100 µg/ml, Acetonitrile, 5ml Price on request