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Residues in the Forage and in Milk from Cows Grazing Forage Treated with Esters of 2,4-D

Published online by Cambridge University Press:  12 June 2017

Dayton L. Klingman
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Beltsville, Maryland
Chester H. Gordon
Affiliation:
Animal Husbandry Research Division, Agricultural Research Service, U. S. Department of Agriculture, Beltsville, Maryland
George Yip
Affiliation:
Division of Food Chemistry, Food and Drug Administration, U. S. Department of Health, Education and Welfare, Washington, D. C.
H. P. Burchfield
Affiliation:
Analytical and Biochemistry, Southwest Research Institute, San Antonio, Texas
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Abstract

Low-volatile and high-volatile esters of 2,4-dichlorophenoxyacetic acid (2,4-D) were sprayed on separate pastures at about double the usual rate. Milk from cows grazing these pastures contained from 0.01 to 0.09 ppm 2,4-D during the first 2 days after spraying and lower amounts thereafter. Residues in milk from cows put into the pastures 4 days after spraying were below 0.01 ppm, the practical limit of precision of the method used. Residues of 2,4-D, in or on forage, declined rapidly during the experiment. Almost all the 2,4-D in or on forage was hydrolyzed to the acid form in samples of forage taken within one-half hour after spraying with the butyl ester of 2,4-D, and about 75% after applying the 2-ethylhexyl ester.

Type
Research Article
Copyright
Copyright © 1966 Weed Science Society of America 

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References

Literature Cited

1. Clark, Donald E., Young, Joel E., Younger, R. L., Hunt, L. M., and McLaran, J. K. 1964. The fate of 2,4-dichlorophenoxyacetic acid in sheep. J. Agr. Food Chem. 12:43.Google Scholar
2. Crafts, A. S. 1960. Evidence for hydrolysis of esters of 2,4-D during absorption by plants. Weeds 8:19.Google Scholar
3. Erickson, Louis C, Brannaman, B. L., and Coggins, Charles Jr. 1964. Two,4-D residues in stored lemons treated with various formulations of 2,4-D. J. Agr. Food Chem. 11:437.Google Scholar
4. Marquardt, Roland P. and Luce, E. N. 1951. Determination of small amounts of 2,4-dichlorophenoxyacetic acid in milk. Analyt. Chem. 23:1484.Google Scholar
5. Marquardt, Roland P., Burchfield, H. P., Storrs, E. E., and Bevenue, A. 1964. Methods for the analysis of pesticides, plant growth regulators and food additives (Gunter Zweig, Editor). Academic Press, New York and London, Vol. 4:Chap. 11, pp. 95116.Google Scholar
6. Mitchell, J. W., Hodgson, R. E., and Gaetjens, C. F. 1946. Tolerance of farm animals to feed containing 2,4-dichlorophenoxyacetic acid. J. Anim. Sci. 5:226.Google Scholar
7. Storrs, E. E. and Burchfield, H. P. 1962. Internal standards in the analysis of chlorine-containing herbicides by gas chromatography. Contrib. Boyce Thompson Inst. 21:423.Google Scholar
8. Yip, George. 1964. Paper chromatographic analysis of chlorophenoxy acids and esters in wheat. J. Assoc. Offic. Agr. Chem. 47:343.Google Scholar
9. Yip, George and Ney, R. E. Jr. 1966. Analysis of 2,4-D residues in milk and forage grasses. Weeds 14:Google Scholar