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为了测定铌及寻求磷钼铌三元络合物形成的适宜条件,笔者曾参照资料于过量磷钼酸存在下,加入不同量的铌,得到了颜色深度与铌量成比例的蓝色络合物。干扰试验证明:不是铌而是存在于铌标准溶液中的酒石酸参与了磷钼杂多酸的还原反应(反应机理尚待研究),基于这一发现,试验了测定磷的酒石酸还原钼蓝光度法。 络合物最大吸收波长在820～830mm处,摩尔吸光系数为2.7×10~4;反应有较好的选择性,硅无干扰,方法适于一般矿石中
In order to determine niobium and seek suitable conditions for the formation of phosphomolybdenum and niobium ternary complex, the author has referred to the data in the presence of excess phosphomolybdic acid, adding different amounts of niobium, obtained a color depth and the proportion of niobium blue complex Things. Interference tests show that tartaric acid, which is not niobium, but is present in the niobium standard solution, is involved in the reduction reaction of phosphomolybdic heteropolyacids (the reaction mechanism is yet to be studied). Based on this finding, the tartaric acid-reducing molybdenum blue photometry . The maximum absorption wavelength of the complex is 820 ~ 830mm, the molar absorption coefficient of 2.7 × 10 ~ 4; the reaction has good selectivity, non-interference of silicon, the method suitable for general ore