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2Flame Atomic Absorption Spectrometric Determination of Trace Cadmium in Alloys and Biological Samples After Solidu2013Liquid Extraction and Preconcentration with Use of Nitroso-S, Microchimica Acta Second-Derivative Spectrophotometric Determination of Trace Copper after Preconcentration with the Ion Pair of 2-Nitroso-1-Naphthol-4-Sulfonic Acid and Tetradecyldimethylbenzylammonium Chloride on Microcrystalline Naphthalene or a Column, Journal of Analytical Chemistry