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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.
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