2011•Journal of Analytical ScienceRequires access

Determination of Trace Cd(II) in Mineral Samples by Flame Atomic Absorption Spectrometry after Separation/Preconcentration with Mesoporous TiO_2

Lin Pin-yan

Abstract

Mesoporous TiO2 material was self-prepared and its adsorption performance towards Cd(Ⅱ) were studied.The optimum conditions of adsorption and desorption were investigated.Trace Cd(Ⅱ) in solution was quantitatively adsorbed by mesoporous TiO2 at pH=6.0,and the capacity of static saturated adsorption was 57.8 mg/g.Cd(Ⅱ) was completely eluted with 1.0 mol/L HCl and the Cd(Ⅱ) eluted was determined by flame atomic absorption spectrometry.The detection limit(3σ) was 23.0 ng/mL,and the relative standard deviation(RSD) was 2.0%(n=7,c=1.0 μg/mL).The recoveries were 94.0%～102.5%.It has been applied to the determination of cadmium in mineral samples with satisfactory results.

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Key concepts: Chemistry, Adsorption, Detection limit, Elution, Mesoporous material, Desorption, Cadmium, Atomic absorption spectroscopy