镍基合金中含铌、钽时,由于合金成分复杂以及铌、钽性质相似,钽的测定是比较困难的课题。采用分离后重量法和光度法测定,手续繁,时间长。中科院沈阳金属研究所孙若诚曾提出双波长光度法测定。鉴于导数分光光度法具有消除重叠吸收带干扰和混浊背景影响的优点,孙若诚等探索了用导数光度法测定钽的可能性。实验结果表明:用 Ni-based alloys containing niobium, tantalum, the alloy composition is complex and niobium, tantalum properties similar to the measurement of tantalum is more difficult issue. After separation using the gravimetric method and spectrophotometry, the procedure is complicated and takes a long time. Sun Ruocheng Shenyang Institute of Metal Research has proposed double-wavelength spectrophotometry. Since derivative spectrophotometry has the advantage of eliminating the effects of overlapping absorption bands and turbid background, Sun et al. Explored the possibility of using derivative spectrophotometry for the determination of tantalum. Experimental results show that: use