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在3.4N盐酸底液中,借金属铝块的还原作用,使钛(Ⅳ)还原成钛(Ⅲ),直接用方波极谱法测定钛铟合金中的铟(0.03～0.5％)。从而避免了用有机试剂萃取分离。本方法有较好的重现性、稳定性,操作简单、快速等优点,试验结果表明:盐酸浓度对铟氯络合物的峰电位无显著影响,峰电流随盐酸浓度增大而增高,2.5～5N时恒定;硫酸浓度<3N时,铟(Ⅲ)离子峰电位在-0.6～-0.62伏范围内变化,而对峰电流无明显影响;钛(Ⅳ)离子存在时有严重干扰;10～30毫克钛(Ⅲ)离子存在时,使峰电位正移0.16伏,而对峰电流没有影响;24毫克金属铝块已能消除20毫克钛(Ⅳ)对60微克铟的干扰;铝(Ⅲ)离子的量使铟峰电流相应降低;铟0～4微克/毫升与峰高呈良好的线性关系。
Titanium (IV) is reduced to titanium (III) by reducing aluminum metal in 3.4N hydrochloric acid base solution, and the content of indium (0.03-0.5%) in titanium indium alloy is measured by square wave polarography directly. Thus avoiding the use of organic reagent extraction and separation. The method has the advantages of good reproducibility, stability, simple operation, fastness and the like. The experimental results show that: the hydrochloric acid concentration has no significant effect on the peak potential of the indium-chloro complex, and the peak current increases with the hydrochloric acid concentration increasing. 2.5 ~ 5N, the peak potential of indium (Ⅲ) ions varied from -0.6 to -0.62 V at sulfuric acid concentration <3N, but had no significant effect on the peak current; the interference of titanium (Ⅳ) In the presence of 30 mg Ti (Ⅲ) ions, the peak potential was positively shifted 0.16 volts without any effect on the peak current. The 24 mg aluminum metal block had been able to eliminate the interference of 20 mg titanium (IV) to 60 μg indium. The amount of ions decreased the indium peak current correspondingly; indium 0-4 μg / ml exhibited a good linear relationship with the peak height.