EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79675 1,2,4-Trichlorobenzene Price on request 33154 EPA Method 552.1, 552.2 - Haloacetic Acids Price on request 56332 EPA Method 200.8 Internal Standard Price on request