Application of multiwalled carbon nanotubes treated by potassium permanganate for determination of trace cadmium prior to flame atomic absorption spectrometry  

作　　者：XIAO Jun-ping ZHOU Qing-xiang BAI Hua-hua 

机构地区：[1]Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China [2]Henan Key Laboratory for Environmental Pollution Control, School of Chemistry and Environmental Sciences Henan Normal University, Xinxiang 453007, China

出　　处：《Journal of Environmental Sciences》2007年第10期1266-1271,共6页环境科学学报（英文版）

基　　金：Project supported by the Hi-Tech Research and Development Program (863) of China (No.2006AA06Z424);Personal Innovation Foundation of Universities in Henan Province (No.[2005]-126);Youth Science Foundation of Henan Normal University (No.2004005);Natural Science Foundation of Henan Province (No.072300460010).

摘　　要：In this study we investigated the enrichment ability of oxidized multiwalled carbon nanotubes （MWCNTs） and established a new method for the determination of trace cadmium in environment with flame atomic absorption spectrometry. The MWCNTs were oxidized by potassium permanganate under appropriate conditions before use as preconcentration packing. Parameters influencing the recoveries of target analytes were optimized. Under optimal conditions, the target analyte exhibited a good linearity （R^2=0.9992） over the concentration range 0.5-50 ng/ml. The detection limit and precision of the proposed method were 0.15 ng/ml and 2.06%, respectively. The proposed method was applied to the determination of cadmium in real-world environmental samples and the recoveries were in the range of 91.3%-108.0%. All these experimental results indicated that this new procedure could be applied to the determination of trace cadmium in environmental waters.In this study we investigated the enrichment ability of oxidized multiwalled carbon nanotubes （MWCNTs） and established a new method for the determination of trace cadmium in environment with flame atomic absorption spectrometry. The MWCNTs were oxidized by potassium permanganate under appropriate conditions before use as preconcentration packing. Parameters influencing the recoveries of target analytes were optimized. Under optimal conditions, the target analyte exhibited a good linearity （R^2=0.9992） over the concentration range 0.5-50 ng/ml. The detection limit and precision of the proposed method were 0.15 ng/ml and 2.06%, respectively. The proposed method was applied to the determination of cadmium in real-world environmental samples and the recoveries were in the range of 91.3%-108.0%. All these experimental results indicated that this new procedure could be applied to the determination of trace cadmium in environmental waters.

关 键 词：multiwalled carbon nanombes （MWCNTs） solid-phase extraction flame atomic absorption spectrometry 

分 类 号：X132[环境科学与工程—环境科学]