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十几年来离子选择电极的发展,已使元素周期表上46个元素能直接或间接的用电极法测定,但元素钽的离子选择电极迄今尚是个空白,有关钽离子电极的试制和应用均未见文献报导。钽离子易水解,在氢氟酸溶液中,钽形成非常稳定的氟盐络合物,主要取决于氢氟酸浓度,常以[TaF_7]~(2-)、[TaF_6]~-络阴离子形式存在,此络阴离子与碱性染料阳离子缔合成三元络合物,并为非极性有机溶剂萃取是目前萃取比色钽的常用方法。同时,我们在研制氟硼酸根电极时,发现钽是强干扰元素,可能系Ta成TaF_6~-为BF_4~-电极所响应。因此,我们设想
More than ten years of development of ion-selective electrodes have enabled 46 elements in the periodic table to be directly or indirectly determined by the electrode method. However, the tantalum ion-selective electrode has so far been a blank. See the literature. Tantalum ions are easily hydrolyzed. In hydrofluoric acid solution, tantalum forms a very stable fluoride salt complex mainly depending on the concentration of hydrofluoric acid, usually in the form of [TaF_7] ~ (2-), [TaF_6] Exist, this complex anion and basic dye cationic association ternary complex, and non-polar organic solvent extraction is currently the colorimetric extraction of tantalum common method. At the same time, when we developed the fluoroborate electrode, we found that tantalum is a strong interference element, which may be caused by the TaF_6 ~ - as the BF_4 ~ - electrode. So we imagine