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Chlorophenoxy acids are toxic compounds used as selective herbicides in agriculture. To meet the need to determine trace levels of such pesticides in ground and drinking water, a highly selective and sensitive method using HPLC in combination with electrochemical detection has been developed. The four phenoxy acids 4-chloro-2-methylphenoxyacetic acid (MCPA), 4-(4-chloro-2-methylophenoxy)butyric acid...