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Dissipation of Residues of 2,4-D in Static Water¹

ABSTRACT

The rate of dissipation of residues of 2,4-D (2,4-dichlorophenoxy acetic acid) at the point of application, applied for control of aquatic vegetation, was found to be affected by the rate of treatment, depth of water, mean temperature, and time after treatment. For the standard rate of treatment, i.e., 4.48 kilograms acid equivalent per hectare (kg ae/ha) there was a decrease of 58 parts per billion (ppb) in residue for each 0.61 m increase in depth of water treated, a decrease of 115 ppb in residue for each 7C increase in mean temperature, and a decrease of 53 ppb in residue for each 7-day interval of time after treatment.

Key Words: herbicides • persistence • phenoxy acids • aquatic weed control

¹ Research contribution of the Univ. of Southwestern Louisiana, Lafayette, La. and the Office of the Chief of Engineers, Washington, D. C. Supported in part by contract DA-16-047-CIVENG-65-152, U. S. Army Corps of Engineers, District of New Orleans, and the Office of the Chief of Engineers.

² Professor of Chemistry, Dep. of Chem. Eng., Univ. of Southwestern Louisiana and Botanist, Aquatic Plant Control Program, Office of the Chief of Engineers, respectively.

Received for publication November 14, 1975.