Monitoring of dioxins in cow's milk in areas of risk. Part XIV
Monitoring of dioxinen in koemelk in risicogebieden. Deelrapport XIV
Hijman WC , Hartog RS den , Jong APJM de , Liem AKD
RIVM Report 639102012
Since February 1990, dioxin levels are measured in cow's milk of dairy farms in the neighbourhood of dioxin sources such as municipal waste incinerators (MWIs) and metal reclamation plants. Level are expressed in picograms 2,3,7,8-TCDD toxicity equivalents (TEQ) per gram of milk fat, calculated on the basis of international toxicity equivalence factors (I-TEF) for individual congeners. This report presents the results of the measurements in cow's milk of three dairy farms near the MWI of Rotterdam (Lickebaert area), the Netherlands, for the months October to December 1993. After stabilization of the levels between 4.6 +/- 0.2 and 5.1 +/- 0.3 pg TEQ/g of fat in September 1993, an increase is observed to a level between 6.2 +/- 0.3 and 13.2 +/- 0.7 pg TEQ/g of fat in October 1993. In November and December, levels tend to decline, but were still above the Dutch legislation level of 6 pg TEQ/g of fat. The time course of the levels in 1993 seems to parallel those observed in the preceding years.