磺硝酚偶氮若丹宁光度法测定废渣中贵金属的研究

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

在pH3的氯乙酸-NaOH缓冲介质中，1．5％吐温-60存在下，磺硝酚偶氮若丹宁（NSPAR）与铂反应生成2：1稳定配合物，该配合物可被WatersSep-PakC18小柱固相萃取，用氮一氮二甲基甲酰氨（DMF）洗脱后用光度法测定。在洗脱液介质中，λmax=540nm，体系摩尔吸光系数8=6．80×10^4L／mol·cm。金含量在0．0004～0．1μg／mL内符合比尔定律，本方法可用于氰化渣中金含量的测定。

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. Beers law was obeyed in the range of 0. 0004 - 0.1 μg/mL.