Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 407388
Title Kaolinic clay derived PCDD/Fs in the feed chain from a sorting process for potatoes
Author(s) Hoogenboom, L.A.P.; Zeilmaker, M.; Eijkeren, J. van; Kan, K.; Mengelers, M.; Luykx, D.M.A.M.; Traag, W.A.
Source Chemosphere 78 (2010)2. - ISSN 0045-6535 - p. 99 - 105.
Department(s) Rikilt B&T Toxicologie en Effectanalyse
RIKILT - Analyse & Ontwikkeling
RIKILT - R&C Contaminanten
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) dibenzo-p-dioxins - ball clay - united-states - contamination - pcbs - incident - pcdfs - milk - food - origin
Abstract 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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