Application of multiwalled carbon nanotubes as solid phase extraction sorbent for preconcentration of trace copper in water samples
Application of multiwalled carbon nanotubes as solid phase extraction sorbent for preconcentration of trace copper in water samples
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DOI：
10.1002/jssc.200500154
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发表时间：
2005-11-01
影响因子：
3.1
通讯作者：
Song, F
中科院分区：
文献类型：
--
作者：
Liang, P;Ding, Q;Song, F
系统研究了多壁碳纳米管(MWNTs)对铜的吸附行为，建立了一种火焰原子吸收光谱分析水样中痕量铜的新方法。考察了样品的pH值、流速、体积、洗脱液和干扰离子等因素对铜的最佳预富集条件。在pH值为5-8的范围内，多壁碳纳米管能定量地保留铜，然后用0.5M硝酸完全洗脱。该方法对铜的检出限为0.42 ng/m L，当铜含量为10 ng/m L时，相对标准偏差为3.5%。用标准物质验证了方法的有效性，并成功地用于水样中痕量铜的测定。
The adsorption behavior of multiwalled carbon nanotubes (MWNTs) toward copper has been investigated systemically, and a new method has been developed for the determination of trace copper in water samples based on preconcentration with a microcolumn packed with MWNTs prior to its determination by flame atomic absorption spectrometry. The optimum experimental parameters for preconcentration of copper, such as pH of the sample, sample flow rate and volume, elution solution and interfering ions, have been investigated. Copper can be quantitatively retained by MWNTs in the pH range 5-8, and then eluted completely with 0.5 M HNO3. The detection limit of this method for Cu was 0.42 ng/mL, and the RSD was 3.5% at the 10 ng/mL Cu level. The method was validated using a certified reference material, and has been successfully applied for the determination of trace copper in water samples.