EPA Method 509 Internal Standard Back Catalog number: 30097 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 51053 ASTM D1387-90 Column Resolution Test Standard Price on request DF-1378-S 1,3,7,8-Tetrachlorodibenzofuran, 1.2ml x 50ug/ml, nonane Price on request 72561 Diclofop acid Price on request