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This study aimed to determine the concentrations of 2,4-dichlorophenoxyacetic acid (2,4-D) using salting-out assisted liquid–liquid extraction (SALLE) in influent and effluent of Ahvaz water treatment plants during 2018–2019. All measured concentrations were less than the maximum allowable concentrations recommended by the National Standards Organization of Iran (1053) and WHO guidelines. The results showed that the Ahvaz treatment plant decreased the concentration of 2,4-D by 69.2%. Therefore, it is necessary to measure the persistent organic pollutants such as pesticides in different seasons, especially in autumn, winter, and spring that the chemical fertilizers and pesticides are commonly used.

Monitoring of 2,4-dichlorophenoxyacetic acid concentration in Karun River and effluents of water treatment plants