[Study on adsorption behavior of nanosized barium-strontium titanate powder for lead ion in water using FAAS]

Nanosized barium-stroutium titanate (BST) powder, a double salt sorbent, was prepared from BaCl2, SrCl2 and TiCl4 by using oxalate co-precipitate method, and characterized by using transmission electron microscope (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectrophotometer (FTIR). By means of determination with flame atomic absorption spectrometry (FAAS), the adsorption characteristic of lead on the BST powder w as investigated. The results showed that theforms of the BST powders are clubbed, highly pure perovskite, and the average particle diameter is 36 nm. Lead can be adsorbed strongly on nanosized BST. The adsorption capacity of BST nanoparticle towards lead was found to be 13 mg x g(-1) when the pH is 6.0, and 0.5 mol x L(-1) HNO3 is sufficient for complete elution. A new method for the determination of trace lead based on BST nanoparticle separation/preconcentration and FAAS determination was proposed. The detection limit of this method for lead ion is 11 microg x L(-1), and the relative standard deviation is 2.6%. The method has been applied to the determination of trace lead in water samples with satisfactory results.