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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 ,
Chester H. Gordon ,
George Yip  and
H. P. Burchfield
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
Information
Weeds , Volume 14 , Issue 2 , April 1966 , pp. 164 - 167
Copyright
Copyright © 1966 Weed Science Society of America 

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References

Literature Cited

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