Hostname: page-component-7b7567c8c-wxvwp Total loading time: 0 Render date: 2026-11-15T19:49:48.135Z Has data issue: false hasContentIssue false

Influence of Several Algae on 2,4-D Residues in Water

Published online by Cambridge University Press:  12 June 2017

J. P. Valentine
Affiliation:
Dep. of Plant Pathol. and Physiol., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
S. W. Bingham
Affiliation:
Dep. of Plant Pathol. and Physiol., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061

Abstract

Removal of [2-14C] 2,4-D [(2,4-dichlorophenoxy)-acetic acid] from water was pronounced with Scenedesmus quadricauda (Turp.) Breb. and most effective uptake occurred at pH 4.7. Three other algae were relatively ineffective in removal of 2,4-D. Increasing Scenedesmus cell density increased 2,4-D removal, but the amount absorbed was not a linear function of cell density. Similarly, with a range of herbicide concentrations (0.01 to 1.0 ppmw) the amount removed was greatest at the highest concentration; however, a higher percentage of chemical was removed at lower concentrations. An equilibrium of 14C removal from water and 14C released to the water was reached by 4 hr. More herbicide was removed from water by Scenedesmus in darkness than in light and low temperature (2 C) reduced uptake slightly. Relatively high 2,4-D concentrations were required to reduce growth in any of the four algae and Scenedesmus was most sensitive. Scenedesmus metabolized [ring −14C] in 24 hr to several products which were found in suspension fluid and cells. Quantitatively, 3-OH-2,4-D [3-hydroxy-2,4-dichlorophenoxy)acetic acid] was the major metabolite, comprising 26% of the radioactivity extracted from cells compared to 15% from suspension fluid. A smaller amount of 5-OH-2,4-D [(5-hydroxy-2,4-dichlorophenoxy)acetic acid] was isolated from the suspension fluid and none from the cells.

Information

Type
Research Article
Copyright
Copyright © 1974 by the Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable