分析测试学报2012，Vol.31Issue(12)：1545-1549,5.DOI:10.3969/j.issn.1004-4957.2012.12.013
双硫腙修饰纳米TiO2分离富集石墨炉原子吸收光谱法测定水样中痕量金属离子
Determination of Trace Metal Ions in Water by Graphite Furnace Atomic Absorption Spectrometry after Separation and Preconcentration with Dithizone-modified Nanometer TiO2
摘要
Abstract
A new method was proposed for the determination of trace cadmium, chromium and lead by graphite furnace atomic absorption spectrometry (GFAAS) after preconcentration with dithizone-modified nanometer titanium dioxide (TiO2 - DZ). The conditions of adsorbing and desorbing of nanometer TiO2 - DZ for Cd2+ , Cr3 + and Pb2+ was optimized. The results indicated that the three metals could be quantitatively preconcentrated on the nanometer material at pH 5. 0 and the static adsorption capacity of Cd, Cr and Pb were 13. 3, 5. 5 and 21. 8 mg/g, respectively. The preconcentrated metal ions could be completely eluted with 5 mL 0. 1 mol/L HNO3. Under the optimum conditions, the detection limits (3a, n =11) for Cd2+ , Cr3 + and Pb2+ were 0.18, 0. 51 and 1. 92 ng/L, respectively, and the relative standard deviations were 2. 8% , 2. 3% and 1.0% , respectively. The spiked recoveries ranged from 96% to 101% . The proposed method was successfully applied in the determination of trace cadmium , chromium and lead in natural water samples with satisfactory results.关键词
纳米TiO2/双硫腙/分离富集/金属离子/石墨炉原子吸收光谱法Key words
nanometer TiO2/ dithizone/ separation and preconcentration/ metal ions/ graphite furnace atomic absorption spectrometry分类
数理科学引用本文复制引用
盖方媛,任光娟,刘惠涛,高原..双硫腙修饰纳米TiO2分离富集石墨炉原子吸收光谱法测定水样中痕量金属离子[J].分析测试学报,2012,31(12):1545-1549,5.基金项目
国家自然科学基金项目(51073132) （51073132）
