EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9319.7-100MG Metribuzin-desamino-diketo, neat, Solvent-neat, Unit 100mg, # of units-1, Cas.no. 52236-30-3 Price on request 59649 Anions Mix - Chloride + Sulfate as SO4 Price on request 50815 ICP Mix Price on request