Certification of an animal feed reference material for the organochlorine pesticide contents: BCR CRM 115 |
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Authors: | L. G. M. T. Tuinstra A. H. Roos B. Griepink E. A. Maier |
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Affiliation: | (1) RIKILT-DLO, Box 230, 6700 AE Wageningen, The Netherlands, NL;(2) Commission of the European Communities, Measurements and Testing Programme (BCR), Rue de la Loi 200, B-1049 Brussels, Belgium, BE |
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Abstract: | An animal feed reference material has been prepared and enriched with 15 organochlorine pesticides at levels close to the maximum residue limits set up in the European Directive 74/63/EEC. The homogeneity of the material has been assessed on the basis of the pesticide contents at a level of sample intake of 5 g. The one year stability study revealed an instability of heptachlor, o,p′-DDT, p,p′-DDT, α-HCH and γ-HCH (decrease in content) and p,p′-TDE (increase) at +37 °C; at +20 °C no instability could be demonstrated. The material has been certified in an interlaboratory certification study for: HCB (0.0194 mg/kg), β-HCH (0.023 mg/kg), γ-HCH (0.0218 mg/kg), heptachlor (0.019 mg/kg), γ-Chlordane (0.048 mg/kg), α-Endosulfan (0.046 mg/kg), Dieldrin (0.018 mg/kg), Endrin (0.046 mg/kg), o,p′-DDT (0.046 mg/kg) and p,p′-DDE (0.047 mg/kg). The α-HCH isomer, Aldrin, β-Heptachloro-epoxide, p,p′-DDT and p,p′-TDE could not be certified. The methods used for the certification are described as well as the major difficulties encountered in the study. Received: 1 July 1996/Revised: 14 October 1996/Accepted: 16 October 1996 |
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