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研究了在阴离子表面活性剂十二烷基硫酸钠(SDS)存在下,2(3,5-二溴-2-吡啶偶氮)-5-二乙氨基苯酚(3,5-二Br-PADAP)与银的显色反应。实验结果表明,显色的适宜酸度为pH3-8,络合物的最大吸收波长为570nm,在此波长下测得其表观摩尔系数为7.7×10~4,银量在0-25μg/25ml范围内遵守比尔定律。络合物组成比为Ag:R=1:2,本法以EDTA作掩蔽剂可以不经分离,直接测定简单样品中的银。
The effect of 2 (3,5-dibromo-2-pyridylazo) -5-diethylaminophenol (3,5-bis-Br-PADAP) in the presence of an anionic surfactant sodium dodecyl sulfate ) And silver color reaction. The experimental results show that the optimum pH for color development is pH3-8 and the maximum absorption wavelength of the complex is 570nm. The apparent molar coefficient of this complex is 7.7 × 10 ~ 4 at this wavelength. The silver content is between 0-25μg / 25ml Observe Bill’s law within the range. Complex composition ratio of Ag: R = 1: 2, this method with EDTA as a masking agent can be separated without direct determination of silver in a simple sample.