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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
引用本文:施踏青,梁沛,李静,江祖成,胡斌.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[J].分析化学,2004,32(11):1495-1497.
作者姓名:施踏青  梁沛  李静  江祖成  胡斌
作者单位:1. 井冈山师范学院,吉安,343009
2. 华中师范大学分析测试中心,武汉,430079
3. 武汉大学化学与分子科学学院,武汉,430072
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pH4.0时,Pb^2 可被纳米TiO2定量富集,吸附于纳米TiO2上的Pb^2 可用0.1mol/L的硝酸完全解脱。本法对Pb^2 的检出限为52ng/L,相对标准偏差为4.7%(n=10,C=0.02mg/L)。本法已用于实际水样中铅的测定,结果满意。

关 键 词:纳米二氧化钛  分离富集  石墨炉原子吸收光谱法  痕量铅  环境监测  精密度

Titanium Dioxide Nanoparticle Separation/Preconcentration and Graphite Furnace Atomic Absorption Spectrometric Determination of Trace Pb in Water Samples
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.
Keywords:Titanium dioxide  separation/preconcentration  lead  graphite furnace atomic absorption  spectrometry
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