Kaolinic clay derived PCDD/Fs in the feed chain from a sorting process for potatoes (2010)

Titel Kaolinic clay derived PCDD/Fs in the feed chain from a sorting process for potatoes
Gepubliceerd in Chemosphere, Vol. 78, No. 2, p.99-105. ISSN 0045-6535.
Auteur Hoogenboom, L.A.P.; Zeilmaker, M.; Eijkeren, van J.; Kan, K.; Mengelers, M.; Luykx, D.M.A.M.; Traag, W.A.
Datum 2010
Trefwoord(en) RIKILT - Analyse & Ontwikkeling, Rikilt B&T Toxicologie en Effectanalyse, Rikilt R&C Contaminanten
Taal Engels
Type Artikel
Samenvatting At the end of 2004, during a routine monitoring project, high levels of PCDDs in milk from two farms were found. Using a bioassay and the congener patterns obtained by HRGC/HRMS, the source was traced back to the use of kaolinic clay for sorting potatoes in a production process of French fries. Rest products, especially peelings after scrubbing, were used as feed for dairy cows. Levels of PCCD/Fs in this product amounted to 44 ng WHO1998-TEQ kg(-1) (88% dw). The maximum level observed in milk was 20 pg WHO1998-TEQ g(-1) fat. A Physiologically Based PharmacoKinetic (PB-PK) model was used to model three data obtained before eliminating the source in order to estimate the starting time of the contamination of the cows, the steady-state level after prolonged contamination and the kinetics of the decrease in the levels after removal of the source. Samples of milk were continuously collected for several months showing a decrease to levels below the product limit of 3 pg WHO1998-TEQ g(-1) fat within 2 months, in excellent agreement with the decrease predicted by the PB-PK model. Different batches of clay were sampled and analysed, showing varying levels of especially PCDDs. All clays were confirmed to be kaolinic clay using X-ray analysis. Other by-products used for animal feed were also contaminated and led to precautionary measures at a few hundred farms, especially pig farms. However, levels in other animal derived products like pig meat did not exceed the product limits
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Persistent Identifier urn:nbn:nl:ui:32-407388
Metadata XML
Repository Wageningen Universiteit & Researchcentrum

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