Simultaneous Determination of Se and Te in Ores by HG-AFS After Online Preconcentration with Nano-TiO2 Immobilized on Silica Gel
ZHOU Jing-rong1, DENG Dong-yan1, HUANG Ke1, TIAN Yun-fei2*, HOU Xian-deng1,2*
1. College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China 2. Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China
Abstract:A simple, sensitive and interference-free method was established for simultaneous determination of trace selenium and tellurium in ore samples by HG-AFS, by using nano-TiO2immobilized on a silica gel packed microcolumn for online preconcentration. Selenium and tellurium were selectively adsorbed to the microcolumn in acidic condition and then completely eluted with 2% (m/v) NaOH solution. The experimental conditions for hydride generation, adsorption, elution and potential interference were investigated in detail. Under the optimum conditions, the detection limits of selenium and tellurium by the proposed method with 180 s sampling time were 4.0 and 3.6 ng·L-1, with sensitivity enhancement of 20- and 13-fold compared to conventional hydride generation method, respectively. The relative standard deviation (RSD, n=5) of this method for 1 μg·L-1 Se(Ⅳ) and Te(Ⅳ) were 0.7% and 2.3%, respectively. This method was applied to determination of selenium and tellurium in several ore samples.
周婧容1,邓冬艳1,黄 科1,田云飞2*,侯贤灯1,2* . 硅胶负载的纳米TiO2在线富集氢化物发生-原子荧光光谱法同时测定矿石中的硒和碲 [J]. 光谱学与光谱分析, 2015, 35(09): 2401-2406.
ZHOU Jing-rong1, DENG Dong-yan1, HUANG Ke1, TIAN Yun-fei2*, HOU Xian-deng1,2* . Simultaneous Determination of Se and Te in Ores by HG-AFS After Online Preconcentration with Nano-TiO2 Immobilized on Silica Gel. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(09): 2401-2406.