Fenoxaprop-P-ethyl, a member of the aryloxy phenoxy-propionate class, is reported to be a grass specific-herbicide with contact and systemic action. Its mode of action involves the inhibition of fatty acid biosynthesis. This herbicide is used for the post-emergence control of perennial and annual grass weeds in a variety of crops such as potatoes, beans, barley, wheat and cotton. This reference material (RM) is produced and certified in accordance with ISO/IEC 17025. This RM is traceable to primary material from an NMI, e.g. NIST or NMIJ. Certified content incl. uncertainty and expiry date are given on the certificate. Download your certificate at: http://www.sigma-aldrich.com. Fenoxaprop-P-ethyl may be used as a reference standard for the quantification of the analyte in commercial formulations and agricultural samples using spectrophotometric and gas chromatography-mass spectrometry techniques.