EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 681481 Diethylene glycol dimethyl ether, 1ml Price on request 673756 Carbofuran, 10.0 µg/ml, Ethyl acetate, 10ml Price on request 10983.10-10MG 5-HIAA-d2,neat,neat,10mg, Price on request