期刊
ANALYTICAL LETTERS
卷 45, 期 16, 页码 2455-2466出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2012.693141
关键词
Anodic oxidation; Fluoride ion response; Headspace SDME; TiO2 nanotube arrays
资金
- National Natural Science Foundation of China [21175047]
- National Science and Technology Special Foundation of China [2009ZX07529-002]
LaF3/titania nanotube array (TNAs) electrodes were fabricated by electrodeposition of LaF3 on synthesized TNAs. The electrode was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersive X-ray spectrometer (EDS). The electrode exhibited excellent response to fluoride ion. The linear calibration range achieved four orders of magnitude of F- concentration (10(-6)-10(-2) mg/ml) and the sensitivity of the electrode is higher than that of ordinary fluoride ion selective electrodes (mode PF-1). The limit of detection (LOD) was estimated to be 4.39 x 10(-7) mg/ml (S/N = 3). The novel electrode was applied to the determination of trace fluoride ions in tap water and toothpaste. Finally, a headspace single-drop microextraction (SDME) system coupled with LaF3/TNAs electrode was successfully applied to determine fluoride in milk samples. The results are satisfactory with an average relative standard deviation (RSD %) of 0.51% and recovery from 96.3% to 107.3%.
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