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近来,有文献报导,在铜铅锌矿中银的邻菲啰啉-曙红-银光变法中引入表面活性剂曲通-305,可提高络台物的灵敏度两倍多,但缺点是空白高。至于镁合金中微量银的测定,除原子吸收光度法外,还未见有资料介绍。在pH=4.5～5.5溶液中,银与邻菲啰啉和曙红形成玫瑰色三元络合物。据报导,此络合物的摩尔吸光系数ε可达3.5×10~4(由于试剂质量,我们测得ε=2.7×10~4)。试验表明,此银络合物与试剂吸光度都随时间的增长而减退,且由于二者减退速度不一致,造成络合物吸光度不稳,即使加入聚乙烯醇或动物胶,明
Recently, it has been reported in the literature that the introduction of the surfactant Triton-305 into the silver phenanthroline-eosin-silver photochemical method of Cu-Pb-Zn ore mine can increase the sensitivity of the photoluminescent complex more than twice. However, . As for the determination of trace silver in magnesium alloys, in addition to atomic absorption spectrometry, there is no information available. In pH = 4.5-5.5, silver forms rosy ternary complexes with o-phenanthroline and eosin. It has been reported that the molar extinction coefficient ε of this complex is up to 3.5 × 10 -4 (ε = 2.7 × 10 -4 due to the mass of the reagent). Experiments show that the absorbance of the silver complexes and reagents are diminished over time, and the rate of decline of the two inconsistent, resulting in complex absorbance instability, even if added polyvinyl alcohol or animal glue, Ming