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在大量钛存在下测定微量钒,文献推荐的方法需先将钒与钛分离:文献方法虽不分离,但钴和铜严重干扰,且样品分解方法较繁:用N-苯甲酰苯基羟胺(BPHA)萃取比色测定钒,钛干扰;文献用氟化物掩蔽钛、锆等离子的干扰,但萃取次数较多,且在强酸介质中有氟化物,操作不便。我们根据文献,在强酸介质中钛(Ⅳ)和钒(Ⅴ)与BPHA可形成溶于某些有机溶剂的络合物,有机相的钛又可被过氧化氢的强酸溶液定量反萃取入水相,而钒(Ⅴ)的BPHA络合物不受影响。该文主要是作石墨中微量钛
In the presence of a large amount of titanium for the determination of trace vanadium, the literature recommends that the method be followed by the separation of vanadium and titanium: although the literature method does not separate, cobalt and copper interfere severely and the sample decomposition method is complicated: with N-benzoylphenylhydroxylamine (BPHA) extraction colorimetric determination of vanadium and titanium interference; literature with fluoride masking titanium, zirconium plasma interference, but more extraction times, and in a strong acid medium with fluoride, the operation inconvenience. According to the literature, titanium (IV) and vanadium (V) and BPHA can form complexes in certain organic solvents in strong acid medium. The titanium in the organic phase can also be quantitatively back-extracted into the aqueous phase by a strong acid solution of hydrogen peroxide , Whereas the BPHA complex of vanadium (V) is unaffected. This paper is mainly for trace titanium in graphite