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Determination of the dioxin and PCB content of animal feed samples for an EC member state collaborative study
Project Code: F01011
Central Science Laboratory
Fernandes, A ; Rose, M; White, S
1. The introduction of legislation in 2002 (Commission Recommendation 2002/201/EC) by the EC, limiting the concentration of dioxins in animal feed has required the monitoring of a range of animal feedingstuffs. The main objective of this requirement is to allow the Commission as well as Member States to assess current background levels of these contaminants, to evaluate the toxicological significance of the exposure of livestock to these contaminants and to propose further reductions in the maximum permitted levels (MRLs) based on the resulting data. An approved sampling plan based on Commission Recommendation 2004/704/EC provided the collection of 163 feed samples from UK regions, during 2005-06 that were analysed for polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs). This report provides concentrations for each sample, of individual dioxin and PCB congeners that have been assigned a WHO-TEF value. A range of additional non-dioxin-like PCB congeners that include the ICES 7 compounds are also reported.
2. The reporting limits quoted for non-ortho-PCBs, ortho-PCBs and dioxin congeners are consistent with the requirements for WHO-TEQ measurement given in EU Commission Directive 2002/70/EC. In practical terms these were typically as low as 0.01 ng/kg whole for dioxins, 0.01 ng/kg whole for non-ortho-PCBs and 0.01 μg/kg whole for the ortho-PCBs.
3. Measurement uncertainty estimates have been calculated as per the Eurachem guide (33) and have been reported for all the individual PCDD/PCDF and PCB congeners. Measurement uncertainty from this data has been extrapolated to the total dioxin and PCB WHO-TEQ values (upper and lower bound) for individual samples.
4. Results presented in this report are expressed on a whole weight basis, for consistency with other data sets and as per EU directive 2002/70/EC. This includes all data on
individual dioxin and PCB congeners as well as WHO-TEQ values. Additional data on fat content and dry matter are presented in Annex A.
5. This work provides current data on dioxin and PCB levels for a range of animal feeds that are available in the UK. The relative concentrations of dioxins and PCBs observed in the different categories were consistent with the observations made in earlier studies. Thus, in general, relatively higher dioxin and PCB levels were observed for fish and fish oil based products as compared to products derived from vegetation or minerals. The vast majority of samples investigated showed dioxin levels that were below the EU maximum permitted levels and action limits. Where any samples showed dioxin levels that approached or exceeded the EU maximum level, these have been re-analysed and the levels confirmed before reporting. The range of upper bound results as ng WHOTEQ/ kg sample is given in the table below. The average and maximum values for all samples are lower than those observed in the previous study on animal feed carried out by the Food Standards Agency in 2004.
|Concentration in ng WHO-TEQ/kg product|
|Feed Type||Dioxins||non-ortho-PCBs||ortho-PCBs||Σ WHO TEQs (upper)|
|Veg based and Compound Feed||Minimum||0.034||0.001||0.019||0.054|
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