Internal Standard for AB SIM Back Catalog number: 94541 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 19267 EPA Method 502/524 Surrogate Standard #2 Price on request 679257 D6-Metazachlor ESA sodium salt, 100 µg/ml, Aceton Price on request 677008 D3-Mepiquat iodide, 10mg Price on request