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Journal of Dairy Science Vol. 57 No. 7 816-825
© 1974 by American Dairy Science Association ®
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Coatings as Barriers to Prevent Polychlorinated Biphenyl Contamination of Silage1,,2

L. B. Willett

Department of Dairy Science, Ohio Agricultural Research and Development Center, Wooster 44691

ABSTRACT

In past years polychlorinated biphenyls were incorporated into a coating material used on the inside of many concrete silos. These residues subsequently diffuse into silages and ultimately pass into food products produced by livestock that consume the contaminated silage. Twelve coating materials were evaluated to determine if they would form a barrier to residues. Coating materials were evaluated by coating contaminated stave blocks, on test sections in a contaminated silo, and on dairy farm silos that were contaminated.

When surfaces contaminated with polychlorinated biphenyls were treated with various barrier coatings and exposed to silage, 9 of 12 coatings reduced the concentration of biphenyls in silage compared to silage adjacent to control surfaces. Coatings carried by water or a solvent in which biphenyls are not readily soluble were the most effective barriers. Coating materials with a base coat to seal the surface prior to application of the surface coating were more effective than two applications of a single formulation. Hydraulic cement with an acrylic bonder and water-carried epoxy effectively reduced residues in silage from contaminated dairy farm silos. Concentrations in milk from cows fed these silages were below Food and Drug Administration "temporary tolerance."

FOOTNOTES

1 Approved as Journal Article no. 157-73, Ohio Agricultural Research and Development Center, Wooster 44691.

2 Supported in part by USDA-ARS Cooperative Agreement no. 12-14-1001-234.






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Copyright © 1974 by the American Dairy Science Association ®.