Journal
TALANTA
Volume 85, Issue 2, Pages 1148-1153Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2011.05.042
Keywords
Solid phase microextraction; Electrosorption; Anions; Carbon nanotubes
Categories
Funding
- National Natural Science Foundation of China [20607017]
- Natural Science Foundation of Fujian Province of China [D0610018]
- NCET of Xiamen University
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A platinum plate coated with single-walled carbon nanotubes (SWCNTs@Pt) was prepared by means of electrophoretic deposition. Using the SWCNTs@Pt plate, an electrosorption-enhanced solid-phase microextraction (EE-SPME) technique was proposed for the extraction of trace anions in water, described as follows: a positive potential was applied to the SWCNTs@Pt plate to extract F-, Cl-, Br-, NO3- and SO42- from water using electrosorption, and then a negative potential was applied to the plate placed in ultra-pure water for the desorption of the absorbed anions, and finally the desorbed anions were analyzed using ion chromatography (IC). The EE-SPME parameters, including extraction potential and time as well as desorption potential and time, were investigated. An analytical method based on the above procedures, i.e., EE-SPME-IC, was established and used for the analysis of trace anions in water. The results showed that the application of potential on the SWCNTs@Pt plate significantly enhanced the ion extraction efficiency, and an enrichment factor of 15-38 was achieved. The SWCNTs@Pt plate could be used more than 50 times without significant decay. The linear range, the limit of detection (S/N = 3), the limit of quantification (S/N = 10) and repeatability (n = 7) of our EE-SPME-IC method were 1.0-150.0 mu g/L, 0.06-0.26 mu g/L, 0.19-0.85 mu g/L and 2.1-8.0%, respectively. The proposed method was successfully applied for the analysis of trace anions in deionized water, and acceptable recoveries between 65.3 and 121.1% were obtained for the spiked deionized water samples. (C) 2011 Elsevier B.V. All rights reserved.
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