EPA Method 552.1 - Surrogate Standard Back Catalog number: 31057 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 92477 VRX 8260 IS & Surrogate Standard Price on request BDD-2378 2,3,7,8-Tetrabromodibenzo-p-dioxin, 1.2ml x 50ug/ml, toluene Price on request 58190 Thorium (Th) Price on request