Produkte ushqimore për kafshë-Përcaktimi i pesticideve -OC dhe PCB-ve me GC/MS

Animal feeding stuffs - Determination of OC-pesticides and PCB’s by GC/MS

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This European Standard specifies a gas chromatographic/mass spectrometric method for the determination of organochlorine pesticides (OC’s) and polychlorinated biphenyls (PCBs) in animal feeding stuffs and oil. The method is applicable to animal feeding stuffs with a water content up to about 20 wt% and oil/fatty samples containing residues of one or more of the following OC’s and PCBs and some of their isomers and degradation products:  Aldrin;  Dieldrin;  Chlordane (= sum of Chlordane isomers and Oxychlordane);  DDT (= sum of isomers op''-DDT, pp''-DDT, pp''-TDE (pp''-DDD), and pp''-DDE);  Endosulfan (sum of -/-isomers and Endosulphanesulphate);  Endrin;  Heptachlor (= sum of Heptachlor and -Heptachlorepoxide);  Hexachlorobenzene (HCB);  Hexachlorocyclohexane isomers -HCH (-BHC), -HCH (-BHC), -HCH (-BHC or lindane);  PCB 28, 52, 101, 138, 153 and 180 (“Indicator PCBs”) and PCB-198, 209. The method is not yet applicable to Chlorocamphene (Toxaphene), a complex mixture of polychlorinated camphenes. Chlorocamphene has a very distinctive chromatographic profile and is easily recognisable by GC/ECD. Positive identification of the toxaphene isomers can be performed by negative chemical ionisation mass spectrometry (NCI-MS), electron impact tandem mass spectrometry (EI-MSxMS) or electron impact high resolution mass spectrometry (EI-HRMS) [1], which is not within the scope of this method. The limit of quantification for the mentioned organochlorine pesticides and PCBs is 5 ng/g in general. However, 10 ng/g applies for Heptachlor Aldrin, Endrin, Dieldrin, and Endosulfan (-, - and sulphate). Individual laboratories are responsible to ensure that the equipment they used will achieve these limits of quantifications.