EPA Method 552,552.1,552.2 Internal Std Back Catalog number: 30105 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 672833 Bispyribac sodium salt, 100mg Price on request 680658 Sodium ethyl sulfate, 100mg Price on request 79212 Decafluorobiphenyl Price on request