Application of multiwalled carbon nanotubes treated by potassium permanganate for determination of trace cadmium prior to flame atomic absorption spectrometry.
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 (R2=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.
Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
Jun-ping
JP
Xiao
Qing-xiang
QX
Zhou
Hua-hua
HH
Bai
D002104:Cadmium / Q000032:analysis* / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011196:Potassium Permanganate / Q000737:chemistry*; D011522:Protons; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic / Q000379:methods*
D037742:Nanotubes, Carbon; D011522:Protons; D002104:Cadmium; D011196:Potassium Permanganate