2,4-Dichlorophenoxyacetic acid, commonly known as 2,4-D, is primarily composed of dichlorophenoxyacetic acid [1]. It is derived from the chlorination and phenoxylation of phenol derivatives [2]. This compound is mainly utilized as a selective herbicide to control broadleaf weeds in various agricultural settings, including crops like corn, wheat, and rice, and in non-crop areas such as lawns and pastures [3]. Additionally, 2,4-D serves as a plant growth regulator, influencing plant development at different concentrations [4].
The production of 2,4-D generally involves the reaction of 2,4-dichlorophenol with chloroacetic acid in an alkaline medium [5]. This process results in the formation of the 2,4-Dichlorophenoxyacetic acid product, which is then purified to meet the required specifications for agricultural use [5].
2,4-Dichlorophenoxyacetic acid functions as a herbicide by mimicking the action of plant hormones, specifically auxins [6]. This disruption leads to uncontrolled cell growth and ultimately, the death of susceptible plants [6]. The effectiveness of 2,4-D lies in its selectivity; it is more readily absorbed by broadleaf plants than by grasses, making it useful for weed control in cereal crops [7].
2,4-Dichlorophenoxyacetic acid is employed in diverse application scenarios, mainly in agriculture for weed control in cereal crops, pasture, and orchards [8]. It is also used in forestry, aquatic environments, and residential areas for managing unwanted vegetation [8].
2,4-Dichlorophenoxyacetic acid are typically packaged in containers that prevent leakage and contamination, such as sealed bags or drums [9]. Storage should be in a cool, dry, and well-ventilated area, away from direct sunlight and incompatible substances [9]. It is essential to adhere to safety guidelines and regulations during handling and storage to prevent environmental contamination and ensure the safety of users [9].
Citations:
[1] Organisation for Economic Co-operation and Development. (2006). 2,4-Dichlorophenoxyacetic acid (2,4-D): Screening Information Dataset (SIDS).
[2] USEPA. (1988). Guidance for the Reregistration of Pesticide Products Containing 2,4-D.
[3] Oregon State University. (2017). 2,4-D. Extension Toxicology Network.
[4] Davies, P. J. (2010). Plant Hormones: Biosynthesis, Signal Transduction, Action!. Springer Science & Business Media.
[5] WHO. (1989). 2,4-Dichlorophenoxyacetic acid (2,4-D). Environmental Health Criteria 84.
[6] Song, I., Hall, J. C., & Stephenson, G. R. (2014). Metabolism of herbicides in plants. Weed Science, 55(5), 437-457.
[7] Peterson, M. A., & Bradford, J. (2018). Herbicide selectivity. University of Missouri Extension.
[8] U.S. Environmental Protection Agency. (2005). 2,4-D RED Facts.
[9] FAO. (1995). Manual on development and use of FAO specifications for plant protection products. Food and Agriculture Organization of the United Nations.
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