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DIOXINS IN MILK POWDER

Objective



Recently attention has been drawn on the presence of polychloro dibenzo-p-dioxins (PCDDs) and polychlorodibenzo furanes (PCDFs) in dairy products. Trade has been hampered because of the suspected presence of higher contents of such contaminants in milk powder, cheese, etc. In some countries incineration plants have been closed because of the presence of dioxins in milk from cows grassing in the surroundings.
The determination of dioxins in food products necessitates sophisticated equipment such as High Resolution Mass Spectrometry (HRMS) and High Resolution Gas Chromatography (HRGC). Sensitivities of 0.1 pg/g have to be achieved in order to accurately determine levels of 6 pg TEC/g fat in milk (TEC = toxic equivalent concentration). This latter content is the maximum tolerable limit for the milk in certain countries (e.g. NL). The extremely low levels to be determined often result in disagreement of the results of the analyses. Therefore doubt has been raised on the validity of the results of the determination of PCDDs and PCDFs and on the quality of the monitored dairy products within the E.C. The necessity has been demonstrated to set up a network of well trained laboratories involved in dioxin determinations in food and feed. This network should possibly cover all Member States.
Some laboratories acting upon request of their national authorities have proposed to the Commission to start a project, within the framework of the BCR programme, on the determination of PCDDs and PCDFs in milk. This project should establish the state of the art of such determinations and should help laboratories to improve the quality of their measurements. A first intercomparison on PCDDs and PCDFs will establish the state of the art of the determination of such compounds in milk. Three batches of freeze-dried milk powder will be prepared - one natural milk powder (approx. 2 pg TEC/g fat of dioxins) - two PCDDs and PCDFs enriched samples (approx. 6 pg TEC and 20 pg TEC/g fat). According to the results of the intercomparison, additional exercises will be envisaged to increase the quality of the measurements. Possibly a milk powder, whenever necessary, will be certified for the PCDD and PCDF content.

STATUS

1st intercomparison concluded

Coordinator

Rikilt
Address
45,Bornsesteeg
6700 AE Wageningen
Netherlands

Participants (12)

Centre National de la Recherche Scientifique (CNRS)
France
Address

69390 Vernaison
Chemische Landesuntersuchungsanstalt Stuttgart
Germany
Address
Breitscheidstraße 4
70174 Stuttgart
IMW-TNO
Netherlands
Address
97,Schoemakerstraat
2600 JA Delft
Institut Fresenius GmbH
Germany
Address
Konrad-adenauer-straße 30
55218 Ingelheim
Institut Fresenius GmbH
Germany
Address
Im Maisel 14
65232 Taunusstein
MAFF Food Science Laboratory
United Kingdom
Address
Norwich Research Park Colney
NR4 7UQ Norwich
National Public Health Institute
Finland
Address

70701 Kuopio
RIVM
Netherlands
Address
9,A. Van Leeuwenhoeklaan
3720 BA Bilthoven
University of Amsterdam
Netherlands
Address
166,Nieuwe Achtergracht
1018 WV Amsterdam
University of Umea
Sweden
Address
20,Comentvägen
90187 Umea
VITO - Vlaamse Inst. voor Technologisch Onderzoek
Belgium
Address
200,Boeretang
2400 Mol
Ökometric GmbH
Germany
Address
Berneckerstraße 17-21
95448 Bayreuth