EPA Method 624 Surrogate Standard Back Catalog number: 19112 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673525 Chlorpyrifos, 10.0 µg/ml, Ethyl acetate, 10ml Price on request N-13091-1G Pristane , 1g Price on request 33452 Carbon tetrachloride Price on request