EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59254 Ammonia as N Price on request 673599 Fluazifop-butyl, 10 µg/ml, Ethyl acetate, 10ml Price on request 19149 2,3,7,8-Tetrachlorodibenzo-p-dioxin Price on request