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Cadmium can be preconcentrated from a large volume of its aqueous samples in the pH range 4.0-7.0 as cadmium-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) ammonium tetraphenylborate ion associated complex on microcrystalline naphthalene or by adsorbing cadmium-2-(5-bromo-2-pyridylazo)-5-diethylaminophe-nol (5-Br-PADAP) cationic complex on the adsorbent ammonium tetraphenylborate naphthalene...
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