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The Effect of Adjuvants and Oil Carriers on Photodecomposition of 2,4-D, Bentazon, and Haloxyfop

Published online by Cambridge University Press:  12 June 2017

S. Kent Harrison  and
Loyd M. Wax
S. Kent Harrison
Affiliation:
Dep. Agron., Univ. Illinois
Loyd M. Wax
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Urbana, IL 61801
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Abstract

Laboratory photolysis rates of 2,4-D [(2,4-dichlorophenoxy)acetic acid], bentazon [3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide], and haloxyfop {2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoic acid} in dilute aqueous solution were enhanced by the presence of adjuvants. Addition of 1.0% (v/v) petroleum oil concentrate (POC), 1.0% (v/v) soybean oil concentrate (SBOC), and 0.15% (v/v) emulsifier package (EP) enhanced herbicide photolysis rates more than addition of 0.15% (v/v) oxysorbic (20 POE) (polyoxyethylene sorbitan monolaurate). Bioassays showed that phytotoxicity of photolyzed herbicide solutions was negatively correlated with time of exposure to ultraviolet light. Addition of 0.85% (v/v) acetophenone to aqueous herbicide solutions containing 0.15% (v/v) oxysorbic strongly sensitized photodegradation of 2,4-D, and to a lesser extent, haloxyfop. Acetophenone had no effect on bentazon photolysis in the presence of oxysorbic. In another study, herbicides were dissolved in white mineral oil or once-refined soybean oil and exposed to ultraviolet light. After a 6-h exposure, there was 92% loss of haloxyfop in mineral oil and 36% loss in soybean oil. There was no difference between oils in affecting the photolysis rate of 2,4-D or bentazon.

Keywords

Additivesbioassayherbicide degradationsoybean oil
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 34 , Issue 1 , January 1986 , pp. 81 - 87
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

Literature Cited

1. Burkhard, N. and Guth, J. A. 1976. Photodegradation of atrazine, atraton and ametryne in aqueous solution with acetone as a photosensitizer. Pestic. Sci. 7:65–71.CrossRefGoogle Scholar
2. Calvert, J. G. and Pitts, J. N. Jr. 1966. Photochemistry. John Wiley & Sons, New York. Pages 824–826.Google Scholar
3. Cochran, W. G. and Cox, G. M. 1957. Experimental Designs, 2nd ed. John Wiley & Sons, New York. Pages 86–90.Google Scholar
4. Crosby, D. G. 1969. Experimental approaches to pesticide photodecomposition. Residue Rev. 25:1–12.Google ScholarPubMed
5. Crosby, D. G. 1976. Herbicide photodecomposition. Pages 835–890 in Kearney, P. C. and Kaufman, D. D., eds. Herbicides: Chemistry, Degradation, and Mode of Action. Vol. 2. Marcel Dekker, Inc., New York.Google Scholar
6. Crosby, D. G. and Leitis, E. 1969. Photodecomposition of chlorobenzoic acids. J. Agric. Food Chem. 17:1033–1035.Google Scholar
7. Crosby, D. G., Moilanen, K. W., Nakagawa, M., and Wong, A. S. 1972. Photonucleophilic reactions of pesticides. Pages 423–433 in Matsumura, F., Boush, G. M., and Misato, T., eds. Environmental Toxicology of Pesticides. Academic Press, New York.Google Scholar
8. Crosby, D. G. and Tutass, H. O. 1966. Photodecomposition of 2,4-dichlorophenoxyacetic acid. J. Agric. Food Chem. 14:596–599.Google Scholar
9. Gear, J. R., Michel, J. G., and Grover, R. 1982. Photochemical degradation of picloram. Pestic. Sci. 13:189–194.Google Scholar
10. Hansen, J. R. and Buchholtz, K. P. 1952. Inactivation of 2,4-D by riboflavin in light. Weeds 1:237–242.Google Scholar
11. Hautala, R. R. 1978. Surfactant effect on pesticide photochemistry in water and soil. EPA Report 600/3-78-060, U.S. Government Printing Office, Washington, DC.Google Scholar
12. Lykken, L. 1972. Role of photosensitizers in alteration of pesticide residues in sunlight. Pages 449–469 in Matsumura, F., Boush, G. M., and Misato, T., eds. Environmental Toxicology of Pesticides. Academic Press, New York.Google Scholar
13. McWhorter, C. G. 1982. The use of adjuvants. Pages 10–25 in Adjuvants for Herbicides. Weed Sci. Soc. Am., Champaign, IL.Google Scholar
14. Miller, G. C. and Zepp, R. G. 1983. Extrapolating photolysis rates from the laboratory to the environment. Residue Rev. 85:89–110.Google Scholar
15. Nilles, G. P. and Zabik, M. J. 1975. Photochemistry of bioactive compounds. Multiphase photodegradation and mass spectral analysis of basagran. J. Agric. Food Chem. 23:410–415.Google Scholar
16. Plimmer, J. R. 1970. The photochemistry of halogenated herbicides. Residue Rev. 33:47–74.Google Scholar
17. Sheets, T. J. 1963. Photochemical alteration and inactivation of amiben. Weeds 11:186–190.Google Scholar
18. Steel, R.G.D. and Torrie, J. H. 1980. Principles and Procedures of Statistics – A Biometrical Approach, 2nd ed. McGraw-Hill Book Co., New York. Pages 401–437.Google Scholar
19. Tanaka, F. S., Wein, R. G., and Mansager, E. R. 1979. Effect of nonionic surfactants on the photochemistry of 3-(4-chlorophenyl)-1,1-dimethylurea in aqueous solution. J. Agric. Food Chem. 27:774–779.Google Scholar
20. Tanaka, F. S., Wein, R. G., and Mansager, E. R. 1981. Survey for surfactant effects on the photodegradation of herbicides in aqueous media. J. Agric. Food Chem. 29:227–230.CrossRefGoogle Scholar
21. Tanaka, F. S., Wein, R. G., and Mansager, E. R. 1982. Photolytic demethylation of monuron and demethylmonuron in aqueous solution. Pestic. Sci. 13:287–294.Google Scholar
22. Van Valkenburg, J. W. 1982. Terminology, classification, and chemistry. Pages 1–9 in Adjuvants for Herbicides. Weed Sci. Soc. Am., Champaign, IL.Google Scholar