【摘要】 提出了纳米TiO2分离富集,火焰原子吸收光谱法测定水样中痕量铅的新方法。考察了铅在纳米TiO2上的吸附动力学、最佳酸度和吸附容量。实验结果表明:在最佳实验条件下,纳米TiO2能定量、快速地吸附水中的痕量Pb2+,其静态吸附容量为17.90 mg/g。吸附在纳米TiO2上的Pb2+可用0.1 mol/L HNO3+0.1 mol/L CH3COOH完全洗脱。对Pb2+的检出限为2.57 ng/mL,相对标准偏差为2.5%(n=11,ρ=0.10μg/mL),加标回收率在94.5%~102.5%之间。可用于实际水样中铅的测定。更多还原

【Abstract】 A new method for the determination of trace Pb based on nanometer-size TiO₂ separation and preconcentration with FAAS was proposed.The optimum conditions for adsorption were studied in detail,and the test included adsorption kinetics,effect of pH on adsorption ratio,and adsorption capacity.Under the optimum conditions,Pb²+ could be adsorbed and eluted quantitatively.The static adsorption capacity of Pb²+ on nanometer-size TiO₂ was 17.90 mg/g,and 0.1 mol/L HNO₃+0.1 mol/L CH₃COOH was sufficient for complete elution.The detection limit of this method for Pb²+ was 2.57 ng/mL,and relative standard deviation was 2.5%（n=11,c=0.10 μg/mL）.The recoveries of Pb²+ ranged from 94.5% to 102.5%.The proposed method has been applied for the determination of trace Pb in water samples with satisfactory results.更多还原