Objective A preliminary intercomparison of levels chlorinated pesticides has shown that results of different laboratories disagree widely. Hence the need for collaborative trials with the aim of preparing certified material. Matrices for which certification is desirable are milk powder, pork fat and animal feed. Two milk powder samples were certified: a spiked one and one with natural (low), endogenous levels. The spiked material will mainly allow the user to verify the quantitative recovery of endogenous pesticides.Certification of pork fat was not performed in the form of spiked materials. Instead, selected pigs were fed with a pesticide enriched diet, before taking their fat for certification of endogenous pesticides.Although chlorinated pesticides (e.g. HCB, HCH, the drins, DDT, etc.) are not being used nor produced anymore in the Community, they are still present in soils because of their high stability and may, therefore, be present in certain crops. In other countries these products are still being used, which makes it necessary to determine chlorinated pesticides in food and animal feed imported from such countries.A preliminary intercomparison has shown that results of different laboratories disagree widely. Hence the need for collaborative trials with the aim of improving the state of the art which could lead to certification exercises.Matrices for which certification is foreseen are: milk powder, pork fat and animal feed. A typical pesticide determination of two parts: (i) extraction and clean-up of the extract, and (ii) separation, identification and quantification. Two milk powder samples were certified: a spiked one and one with natural (low), endogenous levels. The spiked material will mainly allow the user to verify the performance of part (ii) of the determination, because endogenous pesticides are chemically bound to fats, cel walls, etc. which renders the extraction and clean-up of samples with endogenous levels more troublesome in terms of quantitative recovery.The other materials such as pork fat, foreseen to be certified next will not be issued in the form of spiked materials. Hence the necessity to feed selected pigs with a pesticide enriched diet, before taking their fat. Fields of science medical and health scienceshealth sciencesnutritionagricultural sciencesagriculture, forestry, and fisheriesagricultureagricultural sciencesanimal and dairy sciencedomestic animalsanimal husbandryanimal feed Programme(s) FP2-BCR 4 - Research and development programme (EEC) in the field of applied metrology and chemical analysis (Community Bureau of Reference - BCR), 1988-1992 Topic(s) Data not available Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator TNO - CIVO, Zeist EU contribution No data Address 3700 AG ZEIST Netherlands See on map Total cost No data Participants (16) Sort alphabetically Sort by EU Contribution Expand all Collapse all Chemisches Landes- und Staatliches Veterinäruntersuchungsamt Nordrhein-Westfalen Germany EU contribution No data Address Sperlichstraße 19 48151 Münster See on map Total cost No data Istituto Superiore di Santia Italy EU contribution No data Address Viale Regina Elena 299 00161 Roma See on map Total cost No data Keuringdienst van Waren Netherlands EU contribution No data Address 6,Nijenoord 3552 AS UTRECHT See on map Total cost No data Laboratoire de Phytopharmacie France EU contribution No data Address Route de Saint-Cyr 78000 VERSAILLES See on map Total cost No data Laboratoires Associés de Recherches Agricoles France EU contribution No data Address 75 voie du TOEC 31300 Toulouse See on map Total cost No data Milchwirtschaftliche Untersuchungs- und Versuchsanstalt Kempten Germany EU contribution No data Address Hirnbeinstraße 10 87435 Kempten See on map Total cost No data Ministère de l'Agriculture France EU contribution No data Address 43 rue de Danzig 75015 Paris See on map Total cost No data Nestec Ltd. Switzerland EU contribution No data Address 55,Av. Nestlé 1800 VEVEY See on map Total cost No data RIVM Netherlands EU contribution No data Address 9,A. van Leeuwenhoeklaan 3720 BA BILTHOVEN See on map Total cost No data Rijkszuivelstation Belgium EU contribution No data Address 370,Brusselsesteenweg 9090 Melle See on map Total cost No data Rikilt Netherlands EU contribution No data Address 45,Bornsesteeg 6700 AE WAGENINGEN See on map Total cost No data Shell Research Ltd United Kingdom EU contribution No data Address Sittingbourne Research Centre Broad Oak Street ME9 8AG Sittingbourne See on map Total cost No data Städtliches Veterinätuntersuchungsamt Germany EU contribution No data Address Eintrachtweg 17 30173 HANNOVER See on map Total cost No data TNO - CIVO, Zeist Netherlands EU contribution No data Address 3700 AG ZEIST See on map Total cost No data The National Food Center Ireland EU contribution No data Address Dunsinea Castleknock 15 DUBLIN See on map Total cost No data Universidad de Zaragoza Spain EU contribution No data Address Maria Luna, 3 (Pol. Actur) 50015 ZARAGOZA See on map Total cost No data