采用电感耦合等离子体原子发射光谱法不需分离钛基体直接同时测定金属钛中杂质元素钒、铁、镁、铬、锰和铜的含量。样品用氢氟酸、硝酸和硫酸(1+1)溶液消解,通过硫酸络合作用有效地解决了钛水解的问题。试验了基体元素对测定的干扰优化各元素的分析谱线,运用同步背景校正措施消除基体影响。方法的检出限(3s)在0.000 2%~0.001 5%之间。应用此法分析了两个金属钛试样,回收率在90.0%~110.0%之间;相对标准偏差(n=8)小于2.6%。

The impurity elements, including V, Fe, Mg, Cr, Mn and Cu, in metal titanium were determined directly by ICP-AES without separation of matrix titanium. Sample was digested with HF, HNO3 and H2SO4 (1+1), and the complexation of H2SO4 was shown to be very effective to overcome the hydrolysis of titanium. Interference of matrix element was tested and eliminated by synchronous background correction. Analytical spectral lines of the 6 elements for the determination were optimized and selected. Values of detection limits (3s) found were in the range of 0.000 2%-0.001 5%. The proposed method was used in the analysis of two titanium samples, giving values of recovery in the range of 90.0%-110.0% with RSD′s (n=8) less than 2.6%.