Photodegradation of the herbicide glyphosate in water

Details are given of laboratory experiments to determine the effects of artificial light and sunlight on the weedkiller, glyphosate, in de-ionized water and in polluted lake water, both with and without added silty clay loam. Long-wave light had no photodegrading effect on glyphosate, but ultraviole...

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Bibliographic Details
Published in:Bulletin of environmental contamination and toxicology 1986-12, Vol.36 (5), p.723-729
Main Authors: LUND-HØIE, K, FRIESTAD, H. O
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Chemical control
Ecotoxicology, biological effects of pollution
Fresh water environment
Fundamental and applied biological sciences. Psychology
Glycine - analogs & derivatives
Glyphosate
Herbicides
Mercury
Parasitic plants. Weeds
Photochemistry
Phytopathology. Animal pests. Plant and forest protection
Sodium
Sunlight
Water
Water Pollutants
Weeds
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Summary:Details are given of laboratory experiments to determine the effects of artificial light and sunlight on the weedkiller, glyphosate, in de-ionized water and in polluted lake water, both with and without added silty clay loam. Long-wave light had no photodegrading effect on glyphosate, but ultraviolet radiation had a marked effect. The half-live of glyphosate exposed to ultraviolet radiation was about 4 days for an initial concentration of 1 ppm and 3-4 weeks for an initial concentration of 2000 ppm. Photodegradation was more rapid in de-ionized water than in polluted water, and was retarded by the presence of clay. There was evidence that some glyphosate was adsorbed on the sediment.
ISSN:0007-4861
1432-0800
DOI:10.1007/bf01623575