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1-(2-噻唑偶氮)-2-萘酚[TAN]与镍离子产生灵敏的显色反应,但其选择性欠佳而难于直接应用。文献报道了采用萃取分离的手段,但均未能将严重干扰的铁、锌、铜、钴等元素有效分离。本文用TAN作显色剂,吐温-80作增溶剂研究了酒石酸盐,焦磷酸盐和硫代硫酸钠掩蔽铁、锌、铜等离子的效果,并提出光度法直接测定金属铝及稀土铝合金中微量镍。试验部分一试剂与仪器镍标准溶液:从储备的镍标准溶液(硫酸介质)分取一定量用稀盐酸(1+99),依次稀释至每毫升含1.0,0.1,0.01毫克镍。 TAN:0.02% 乙醇溶液
1- (2-thiazolylazo) -2-naphthol [TAN] produces a sensitive color reaction with nickel ions, but its selectivity is poor and difficult to apply directly. Literature reported the use of extraction and separation methods, but failed to interfere with the serious interference of iron, zinc, copper, cobalt and other elements effectively separated. In this paper, the effects of tartrate, pyrophosphate and sodium thiosulfate on the masking of iron, zinc and copper ions were studied by using TAN as chromogenic agent and Tween-80 as solubilizer. And the direct determination of metal aluminum and rare earth aluminum alloy Medium trace nickel. Test Part 1 Reagents and Instruments Nickel standard solution: Dispense a certain amount of dilute hydrochloric acid (1 + 99) from a stock solution of nickel standard solution (sulfuric acid medium) and dilute to 1.0, 0.1 and 0.01 milligrams of nickel per ml. TAN: 0.02% ethanol solution