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锰的光度测定,广泛使用高锰酸法,但灵敏度较低。Katsumi Goto等利用非离子表面活性剂TritonX-100增溶Mn-PAN络合物,以氰化钾为掩蔽剂光度测定锰,ε为4.4×10~4。2(5-溴-2-吡啶偶氮)-5-二氨基酚(简称5-Br-PADAP)是与PAN或PAR相类似的另一类吡啶偶氮染料,与许多金属的显色络合物的摩尔吸光系数为10~5数量级,已被应用于铀、铜、锑和铌等元素的光度分析。笔者发现5-Br-PADAP与锰所形成的橙红色络合物不溶于水而易为三氯甲烷萃取,亦可为Triton X-100增溶。进而提出了5-Br-PADAP-Triton X-100水相光度测定锰的方法,摩尔吸光系数高达1.10×10~5。以少量氰化钾和β-氨基丙荒酸(简称β-DTCPA)为掩蔽剂,不经分离,可直接测定硅酸盐岩石和铝合金中的微量锰。
Photometric determination of manganese, widely used permanganic acid method, but less sensitive. Katsumi Goto et al. Utilized nonionic surfactant Triton X-100 to solubilize Mn-PAN complex and potassium cyanide as a masking agent for photometric determination of manganese with ε of 4.4 × 10 -4.2 (5-bromo-2-pyridyl Nitrogen) -5-diaminophenol (abbreviated as 5-Br-PADAP) is another pyridinium azo dye similar to PAN or PAR. Its molar absorption coefficient with many metal chromogenic complexes is in the order of 10-5 , Has been applied to photometric analysis of uranium, copper, antimony and niobium and other elements. The author found that 5-Br-PADAP and manganese formed by the orange-red complex insoluble in water and easy extraction of chloroform, Triton X-100 can also be solubilized. The method for the determination of manganese in aqueous phase by 5-Br-PADAP-Triton X-100 is also proposed. The molar absorption coefficient is as high as 1.10 × 10 ~ 5. With a small amount of potassium cyanide and β-aminopropylmalonic acid (β-DTCPA) as a masking agent, can be directly measured silicate rock and aluminum in the trace manganese.