A orthogonal design optimization pretreatment combined with gas chromatographic(GC)method was developed for the determination of ethylene dibromide(EDB)residues in canned pineapple.The orthogonal test was used to optimize the ratio of hexane to acetone and the content of sodium sulfate anhydrous.The results indicated that the effection order was as the follows:ratio of hexane to acetone>content of sodium sulfate anhydrous>content of distilled water.The optimal extraction conditions were as follows:sodium su...