Application of multiwalled carbon nanotubes treated by potassiumpermanganate for determination of trace cadmium priorto flame atomic absorption spectrometry
XIAO Jun-ping , ZHOU Qing-xiang , BAI Hua-hua
DOI:
Received December 08, 2006,Revised March 02, 2007, Accepted , Available online
Volume 19,2007,Pages 1266-1271
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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.
