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A HPLC system with on-line reducer, clean-up and concentrator columns has been developed for determining nitropolycyclic aromatic hydrocarbons (NPAHs). Maximum efficiency of the reducer column (Pt/Rh-coated alumina) was achieved after the column was activated with a flow of air/hydrogen at 350 o C for 3h and when ethanol-acetate buffer was used as the sample carrier solution. After a benzene-ethanol...
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