Citation: Sha Hua QIAN, Xue Qin LI, Han LIN, Mei XIAO, Hong Bing DENG, Luo Jing XIANG. Preconcentration of Ultra-trace Cadmium with Nanometer-size TiO₂ Colloid and Determination by GFAAS with Slurry Sampling[J]. Chinese Chemical Letters, ;2006, 17(7): 933-936. shu

Preconcentration of Ultra-trace Cadmium with Nanometer-size TiO₂ Colloid and Determination by GFAAS with Slurry Sampling

College of Resource and Environmental Science, Wuhan University, Wuhan 430072

Received Date: 15 December 2005

A novel method of ultra-trace Cd(Ⅱ) preconcentration with nanometer-size TiO₂ colloid and determination by graphite furnace atomic adsorption spectrometry(GFAAS) with slurry sampling was first advanced in this paper. The adsorption efficiency of nanometer-size TiO₂ colloid for ultra-trace Cd(Ⅱ) could reach above 96% in a short time when the pH value was between 5 and 6. Other problems were also studied, such as adsorption capacity, nanometer-size TiO₂ colloid dosage, effect of coexistent ions. The detection limit(3σ) and the relative standard deviation (R.S.D) of this method were 4.46·10^-3 μg/L and 1.30%(n=7), respectively. The method was successfully applied to the analysis of environmental samples with recoveries between 93.8%and 96.4%.
- Nanometer-size TiO₂ colloid,
- Cd(Ⅱ),
- GFAAS,
- slurry sampling
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