Adsorption capability of nano-sized barium strontium titanate powder for zinc ion

Zinc ion was adsorbed and enriched by nano-sized barium-strontium titanate(BST) powder and the adsorption and elution conditions were investigated.The results showed that zinc ion could be adsorbed quantitively in nano-sized barium-strontium titanate powder and the maximum adsorption capacity of nano-sized barium-strontium titanate powder for zinc was found to be 12 mg/g at pH 6.0.Zinc adsorbed on BST powder was eluted using 0.5 mol/L HNO3 and then determined by flame atomic absorption spectrometry(FAAS).The detection limit of this method was 4.6 μg/L for zinc.The RSD for six determination of 0.01 mol/L zinc was 4.0%.The method has been applied to the determination of trace zinc in river water and pure water samples with recovey of 91.5%-104.5%,and the results are agreement with those obtained by dithizone spectrophotometry.