纳米二氧化钛分离富集石墨炉原子吸收光谱法测定水样中痕量铅

Titanium Dioxide Nanoparticle Separation/Preconcentration and Graphite Furnace Atomic Absorption Spectrometric Determination of Trace Pb in Water Samples

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。

A new method for the determination of trace Pb based on TiO2 nanoparticle separation/preconcentration and GFAAS determination was proposed. The adsorption behavior of Pb on TiO2 nanopartical was studied systemically. It was found that Pb could be adsorbed quantitively on nanometer TiO2 when the pH exceeded 4, and 0.1 mol/L HNO, was sufficient for complete elution. The adsorption capacity of TiO2 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.