Department of Analytical Chemistry, University of Córdoba , E-14071 Córdoba, Spain.
Anal Chem. 2013 Nov 5;85(21):10338-43. doi: 10.1021/ac402256p. Epub 2013 Oct 17.
This article proposes a simple and sensitive approach for the preconcentration and determination of carboxylated single-walled carbon nanotubes (c-SWNTs) in environmental samples using membranes modified with multiwalled carbon nanotubes (MWNTs). The method is based on the preconcentration of c-SWNTs and their direct on-filter Raman spectroscopic analysis. The preconcentration of c-SWNTs is performed by microfiltrating the sample through a cellulose membrane modified with MWNTs fabricated from a surfactant dispersion of the same. The analytes are retained in the membrane through π-π interactions with MWNTs forming the membrane. The G-/D-band ratio of the carbon nanotubes has been used as an analytical parameter to quantify the presence of c-SWNTs, which mainly contribute to the intensity of the G band. The limit of detection was found to be 1 μg·L(-1), and the precision, for a 10 μg·L(-1) concentration of c-SWNTs, was 4.74% intramembrane and 6.3% intermembrane. The optimized procedure was successfully applied to the determination of traces of c-SWNTs in river water samples.
本文提出了一种简单灵敏的方法，用于使用多壁碳纳米管（MWNTs）修饰的膜来预浓缩和测定环境样品中的羧基单壁碳纳米管（c-SWNTs）。该方法基于 c-SWNTs 的预浓缩及其在过滤器上的直接拉曼光谱分析。通过将样品微过滤通过由相同表面活性剂分散体制成的 MWNTs 修饰的纤维素膜来进行 c-SWNTs 的预浓缩。分析物通过与 MWNTs 形成的膜之间的 π-π 相互作用保留在膜中。碳纳米管的 G-/D-带比被用作分析参数来定量存在的 c-SWNTs，其主要贡献了 G 带的强度。检测限为 1μg·L(-1)，对于 10μg·L(-1)浓度的 c-SWNTs，膜内精度为 4.74%，膜间精度为 6.3%。优化后的程序成功应用于河水样品中痕量 c-SWNTs 的测定。
