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A method for the routine monitoring of residual aldrin, dieldrin, pp'-DDT, op'-DDT, pp'-DDE, and pp'-DDD in eggs by high-performance liquid chromatography (HPLC) with a photo-diode array (PDA) detector is described. The lipids extracted from a whole egg are cleaned by a solid-phase extraction (SPE) ISOLUTE NH2 column with a diethyl ether-hexane (5:95, v/v) eluent. The HPLC separation is carried out using a normal-phase (LiChrosorb NH2) column, a heptane-hexane eluent (97:3, v/v), and a PDA detector. The average recoveries from fortified target compounds (0.1, 0.2, 0.3, and 0.4 microg/g, respectively) are &gt; or = 83%, with standard deviations (SDs) between 2 and 5%. The interassay variabilities and their SDs are &lt; or = 4.8% and &lt; or =0.7%, with intra-assay variabilities of 2.1-3.3%. The limits of determination for these compounds range from 0.04 to 0.08 microg/g.

Normal-Phase High-Performance Liquid Chromatographic Determination and Identification of Aldrin, Dieldrin, and DDTs in Eggs