【摘要】 提出了纳米TiO2 分离富集 ,GFAAS测定水样中痕量铅的新方法。详细考察了纳米TiO2 对铅的吸附行为 ,结果表明 :在 pH 4 .0时 ,Pb2 + 可被纳米TiO2 定量富集 ,吸附于纳米TiO2 上的Pb2 + 可用 0 .1mol/L的硝酸完全解脱。本法对Pb2 + 的检出限为 5 2ng/L ,相对标准偏差为 4 .7% (n =10 ,C =0 .0 2mg/L)。本法已用于实际水样中铅的测定 ,结果满意。更多还原

【Abstract】 A new method for the determination of trace Pb based on TiO 2 nanoparticle separation/preconcentration and GFAAS determination was proposed. The adsorption behavior of Pb on TiO 2 nanopartical was studied systemically. It was found that Pb could be adsorbed quantitively on nanometer TiO 2 when the pH exceeded 4, and 0.1 mol/L HNO 3 was sufficient for complete elution. The adsorption capacity of TiO 2 nanoparticle toward Pb was found to be 8.7 mg/g. The detection limit of this method for Pb was 52 ng/L, and relative standard deviation was 4.7% ( n=10, C =0.02 mg/L). The proposed method has been applied for the determination of trace Pb in water samples with satisfactory results.更多还原