Relation of the formulation of cattle sprays to the deposition and loss of DDT

Autor: H. J. Schnltzerling, W. J. Roulston
Rok vydání: 1965
Předmět:
Zdroj: Journal of the Science of Food and Agriculture. 16:179-185
ISSN: 1097-0010
0022-5142
DOI: 10.1002/jsfa.2740160402
Popis: The deposition and loss of DDT from various DDT formulations sprayed on to cattle were investigated as part of a general study aimed at increasing the persistence of acaricides on cattle. Exceptionally high DDT deposits resulted from several types of formulations: (a) a cationic emulsion, the charge of which was adjusted to take advantage of the known negative charge on cattle hair, (b) an emulsion which broke during spraying, possibly through the hardness of the water, (c) a wettable powder. The high deposition from (a) was presumably due to the electrostatic attraction of the emulsion droplets to the hair and that of (b) and (c) to the filtering action of the hair on the relatively large particles in the spray fluid. The time for half the initial deposit to be lost from the hair of cattle was used as a basis for comparison. Within experiments the rate of loss of DDT varied little and the rate was unaffected by addition of resins or ‘stickers’. It is apparent that the factors involved in the removal of DDT from cattle coats differ in nature from those affecting deposits on inert surfaces. The rate of loss was less in winter than in summer.
Databáze: OpenAIRE
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