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我们在研究锑磷钼和砷磷钼三元杂多酸的过程中,证实了资料指出的锑(Ⅲ)进入了杂多酸,分子组成比为Sb:P:Mo为2:1:12.磷(Ⅴ)和锑(Ⅲ)都是整个络合阴离子的中心体,既然可用以测定磷,也应可以用于测定锑.若测锑,则磷和钼必须过量,才能使锑(Ⅲ)定量地进入杂多酸.二元磷钼杂多酸的干扰可用提高酸度、以空白溶液作参比加以消除.孔雀绿阳离子和锑磷钼蓝阴离子在适当的酸度下缔合,可大大提高其灵敏度.最大吸收波长为640纳米,摩尔吸光系数为1.6×10~5升·摩尔~(-1)·厘米~(-1),0～20微克锑/50毫升符合比尔定律.
We studied the antimony phosphomolybdate and arsenic phosphomolybdenum ternary heteropolyacid process, confirmed that the information points to the antimony (Ⅲ) into the heteropoly acid, the molecular composition ratio of Sb: P: Mo is 2: 1: 12. Phosphorus (V) and antimony (III) are the central body of the complex anion, since it can be used to determine phosphorus, it should also be used for the determination of antimony.If the antimony, phosphorus and molybdenum must be excessive in order to antimony (Ⅲ) Quantitative access to heteropolyacids.Double molybdenum and molybdenum heteropolyacid interference can be used to increase the acidity, with a blank solution as a reference to be eliminated.Macrocyanide and antimony phosphomolybdate blue anions associate with the appropriate acidity can greatly enhance its Sensitivity The maximum absorption wavelength is 640 nm, the molar absorptivity is 1.6 × 10 -5 mol · cm -1, and 0-20 μg antimony / 50 ml accords with Beer’s law.