2026-06-09T20:23:07+02:00 https://library.wur.nl/oai

oai:library.wur.nl:wurpubs/407388 2026-03-31

urn:nbn:nl:ui:32-407388 2026-03-31 urn:nbn:nl:ui:32-407388/mods Kaolinic clay derived PCDD/Fs in the feed chain from a sorting process for potatoes Hoogenboom L.A.P. 083275215 0000-0002-8913-5328 0000000393020897 aut Zeilmaker M. aut van Eijkeren J. aut Kan K. aut Mengelers M. aut Luykx D.M.A.M. 172274338 0000000387573647 aut Traag W.A. 115293620 0000000390253185 aut text info:eu-repo/semantics/article 2010 10.1016/j.chemosphere.2009.10.016 2-s2.0-71649097087 000272888200004 en 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 RIKILT - R&C Contaminanten Rikilt B&T Toxicologie en Effectanalyse BU Microbiological & Chemical Food Analysis ball clay contamination dibenzo-p-dioxins food incident milk origin pcbs pcdfs united-states RIKILT - R&C Contaminanten Rikilt B&T Toxicologie en Effectanalyse BU Microbiologische & Chemische Voedselanalyse Chemosphere 78 2 99 105 00456535 urn:nbn:nl:ui:32-407388/obj 2026-03-31 http://purl.org/eprint/accessRights/RestrictedAccess