Retention Time Verification Standard Back Catalog number: 51172 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675553 Chlorthiophos, 10.0 µg/ml, Ethyl acetate, 10ml Price on request 676134 S-Metolachlor Metabolite CGA 50720, 100 µg/ml, Ac Price on request 50797 Ammonium as NH3 Price on request