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该法基于用四辛基乙基二胺CHCl_3溶液从HF和HF+HCl混合酸中萃取钽、铌、钛、锆、钨和铁(111)。从1.2MHF和1.0MHCl溶液中可以定量地使钽与铌和其他共存元素分离。此法已用于复杂成份合金中铌和钽的测定。测定步骤。于氟塑料杯中把0.2克合金试样溶于10毫升浓HF,同时逐滴加入浓HNO_3至合金完全溶解。在砂上加热溶液、蒸发近干。将残渣溶于10毫升1.2MHF和1.0MHCI混合酸中。如果溶液显黄色则加入一些NH_4F晶体至溶液退色把溶液移入25毫升聚乙烯试管
This method is based on the extraction of tantalum, niobium, titanium, zirconium, tungsten and iron (111) from mixed HF and HF + HCl solutions with tetraoctyl ethyldiamine CHCl 3. Tantalum can be quantitatively separated from niobium and other coexisting elements from 1.2MHF and 1.0M HCl solutions. This method has been used for the determination of niobium and tantalum in complex alloys. Determination steps. In a fluoroplastic cup, 0.2 g of the alloy sample was dissolved in 10 ml of concentrated HF and concentrated HNO3 was added dropwise until the alloy was completely dissolved. Heat the solution on sand and evaporate nearly dry. The residue was dissolved in 10 mL of 1.2 M HF and 1.0 M HCI mixed acid. If the solution is yellow, add some NH_4F crystals to the solution Fade the solution into a 25 ml polyethylene test tube