Aryl phenoxy acid herbicides

Ci8 Empore extraction disks were used for the isolation and trace enrichment of phenylureas in 1 L of river water [68]. Triazines and aryl phenoxy acid herbicides were extracted with good recovery by 0.5 L tap water and 0.1 L groundwater [31,69,70] by PS-DVB disks. A combination of the SPE disk technology for extracting analytes in water and supercritical fluid extraction technology for reextracting analytes from disks has been applied to the analysis of metsulfuron-methyl and chlorsulfuron [71]. Phenylureas and triazines were isolated from water and soil extracts by SPE using a layered system of two extraction disks [72]. The first disk consisted of a SAX material imbedded in Teflon, and the second disk, used as a cleanup device, was made of Cis particles also imbedded in Teflon. 

Another growing technique is super-critical fluid chromatography. Recent references to soil analysis include the following applications aliphatic hydrocarbons, polyaromatic hydrocarbons, polychlorobiphenyls, dioxins, alkyl and aryl phosphates, chloro, organophosphorus, triazine, substituted urea, phenoxy acetic acid, Dacthal herbicides and insecticides and mixtures of herbicides and pesticides and mixtures of organic compounds. 

Acetyl-CoA carboxylase (ACC) catalyzes the first step in fatty acid biosynthesis. Owing to its role it has been exploited as an important herbicide target. Two chemical classes, the aryl-oxy-phenoxy-propionate (AOPP or fop) and the cyclo-hexanedione (CHD or dim) herbicides are widely used to control a broad selection of grass weeds in dicot crops and some of them even in cereals or in rice [1, 2]. Their frequent use has resulted in the development of resistance in several grass species [3],... 

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