EPA Method 507 Surrogate Standard Back Catalog number: 19049 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1344.12-50MG 2,6-Dimethylnaphthalene-d12,neat,neat,50mg Price on request 93754 Pesticide Standard Price on request 10983.10-10MG 5-HIAA-d2,neat,neat,10mg, Price on request