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EPA-1613 recommends a 5% Phenyl phase for the analysis of dioxin. If the sample has 2,3,7,8-Tetradioxin in it, the analysis should be confirmed on a 50%-Cyanopropylphenyl-dimethylpolysiloxane GC phase as per EPA 1613. 5% Phenyl Arylene based phase like ZB-Semivolatile, ZB-5MS, ZB-5MSPLUS gives better selectivity compared to traditional 5% phenyl. Separation of Tetradioxins is shown in app 15584