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Spectrophotometric Determination of Noble Metal from Waster Residue with 4-Nitro-6-Sulfophenolazorhodanine

Liu Cong-yue

Abstract

A method for the determination of Aurum from cyanide residue was established based on the color reaction of 4-nitro-6-sulfophenolazorhodanine with Aurum and the solid phase extraction of the colored complex with C18 cartridge.In the presence of pH 3 buffer solution and Tween-60 medium,4-nitro-6-sulfophenolazorhodanine was reacted with Aurum(Ⅱ) to form a stable 2∶1 complex,which was enriched by C18 cartridge and eluted with DMF,and then determined by spectrophotometry at 535 nm.Beer's law was obeyed in the range of 0.0004~ 0.1 μg/mL.

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Key concepts: Nitro, Residue (chemistry), Chemistry, Cartridge, Cyanide, Solid phase extraction, Elution, Chromatography