Preconcentration of Ultra-Trace Germanium in Water Samples with Nano-Sized TiO2 Colloid and Determination by HGAFS with Colloid Sampling
QIAN Sha-hua, LU Min, ZHANG Xu
School of Resources and Environmental Science, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China
Abstract:A novel method for preconcentration of ultra-trace germanium and determination by hydride generation atomic fluorescence spectrometry (HGAFS) was presented in this work. When the pH values of solution were 6.0~8.0, the adsorption efficiency of nano-sized TiO2 colloid for germanium was 97.0%~99.0% in a short time. Nano-sized TiO2 colloid was used to concentrate the ultra-trace germanium in water sample due to its high absorption capacity. After centrifugation, the supernatant fluid was removed. The sediment which contained the concentrated Ge(Ⅳ) was inverted to colloid by adding HCl of certain concentration. Ge(Ⅳ) in colloid was directly determined by HGAFS. The proposed method possesses low detection limit (3σ) (0.060 μg·L-1) and good precision (the relative standard deviation (RSD) is 2.0%, n=6). The method is was also quite simple and time saving (without any filtration and desorption process). Satisfactory results were obtained when applying this method to the determination of ultra-trace germanium in water samples.
钱沙华,鲁 敏,张 旭. 纳米二氧化钛胶体分离富集-氢化物原子荧光光谱法测定水中超痕量锗[J]. 光谱学与光谱分析, 2012, 32(05): 1397-1400.
QIAN Sha-hua, LU Min, ZHANG Xu. Preconcentration of Ultra-Trace Germanium in Water Samples with Nano-Sized TiO2 Colloid and Determination by HGAFS with Colloid Sampling. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(05): 1397-1400.
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