纳米TiO_2材料分离富集、悬浮体进样氟化辅助ETV-ICP-AES直接分析痕量稀土元素

Direct Analysis of Trace Rare Earth Elements Through Nanometer-size Titanium Dioxide Separation/Concentration and Fluorination Assisted ETV-ICP-AES with Slurry Sampling

以纳米 Ti O2 为吸附材料分离富集了稀土离子 Y,Yb,Eu,La,Dy,Tm,Sm,Ho,Nd和 Pr,研究了其吸附性能 ,并将吸附于纳米 Ti O2 上的稀土离子直接制成悬浮体 ,用氟化辅助电热蒸发等离子体原子发射光谱 ( FETV-ICP-AES)进行检测 ,考察了上述稀土离子的蒸发行为 .结果表明 ,基体元素可与待测物在灰化阶段完全分离 ,在优化的实验条件下 ,检出限和 RSD结果均与文献值基本一致 .

In this paper, nanometer-size titanium dioxide(NSTD) is employed as a new type of adsorption material to separate and concentrate trace rare earth elements(Y, Yb, Eu, La, Dy, Tm, Sm, Ho, Nd, Pr). The results show that NSTD can quantitatively adsorbed the ions of the elements under the condition of optimal pH(7.0). The ions adsorbed on NSTD can be directly determined with fluorination assisted electrothermal vaporization inductively coupled plasma atomic emission spectrometry(FETV-ICP-AES) through slurry sampling without elution at proper ashing temperature(600 ℃) and vaporization temperature(2 400 ℃). The detection limit of those elements is 0.1, 0.08, 0.2, 0.3, 0.4, 0.1, 0.4, 0.1, 0.3 and 0.5 ng, respectively, and the corresponding RSD is 2.0%, 1.6%, 2.9%, 2.1%, 3.0%, 1.6%, 2.2%, 1.4%, 2.7% and 3.1%, respectively.