【摘要】 本文提出了磷钼钒杂多酸与耐尔蓝形成的离子缔合物并研究了它的性质及其应用,该络合物在水相中呈蓝色,它和试剂的最大吸收峰分别为570、630nm,表观摩尔吸光系数为1.3×10⁵,在0-10μgV₂O₅50ml中符合比尔定律。磷钼钒杂多酸与耐尔蓝的组成比为1:4。提高酸度可以降低过剩试剂吸光度,加入磷酸可消除钛的干扰,不经任何分离可以测定岩矿中微量钒。更多还原

【Abstract】 The properties and the application of the vanadium phosphomolybdate-nile blue ionassociated complex were studied. Its color is blue in 2. 3N sulfuric acid. lt is more stable in the presence of polyvinyl alcohol. The constituent ratio of vanadium phosphomolybdate to nile blue is 1:4. The complex and the reagent have maximum absorption at 570 nm and 630 nm respectively. The complex has a molar absorptivity of 1. 3×10~5. Beer’s law is obeyed for vanadium in the concentration of 0 to 10 μg/50 ml. In order to eliminate the interference of titanium and silicon, the acidity and the amount of phosphor should be increased when heteropoly acid is formed, and phosphoric acid should be added when the excess of phosphomolybdate is being dissociated by an oxalic acid-tartaric acid-sulfuric acid mixture. Macro amount of titanium and silicon may exist as the tolerable. This method has a high sensitivity and. a good selectivity. In the analysis of iron or silicate minerals with small amount, 0.X to O. OOX% of vanadium can be determined without separation. RSD ranges from 3 to 8%.更多还原