Survey of Dioxin-like Compounds in Dairy Feeds in the United States

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• 作者：Matthew Lorber ; Dwain Winters ; Joseph Ferrario ; Christian Byrne ; Christopher Greene
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2007
• 出版时间：January 24, 2007
• 年：2007
• 卷：55
• 期：2
• 页码：386 - 395
• 全文大小：255K
• 年卷期：v.55,no.2(January 24, 2007)
• ISSN：1520-5118

文摘

The United States Environmental Protection Agency (USEPA) has completed a survey of dioxin-likecompounds (including 17 dioxin and furan (CDD/F) congeners and 12 coplanar polychlorinatedbiphenyl (PCBs) congeners) in dairy feeds from 10 dairy research facilities around the United States,sampling the overall mixtures and the major and minor feed components. Low levels of dioxin werefound in all feed mixtures with an average concentration of 0.05 pg/g (ppt) toxic equivalent (TEQ) dryweight. This is lower than previously found in dairy feeds by about a factor of 4. While it is possiblethat generally lower levels of dioxins in the environment in recent years may explain this result,examinations of the data suggest that the oven drying used to prepare the wet feed samples couldhave resulted in a loss of dioxins from the feed materials. The percentage of the total TEQ due toCDD/Fs was about four times that of PCBs. Leafy vegetations in the feed (the silages and the hays)had concentrations about twice as high as nonleafy, protected vegetation of the feeds (the ground ormeal corn, cottonseed, and others). Minor components did not significantly influence the final feedmixture concentration of dioxin TEQ. However, in one of the feed mixtures, a minor component witha high concentration of 38.5 ppt TEQ effectively doubled the concentration of the overall feed mixture.