期刊
TALANTA
卷 80, 期 3, 页码 1239-1244出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2009.09.016
关键词
Carbonyl generation; Sample introduction; Atomic fluorescence spectrometry
资金
- National Natural Science Foundation of China [20775051, 20835003]
UV-induced carbonyl generation with formic acid is used for gaseous sample introduction into an atomic fluorescence spectrometer for the determination of ultra-trace nickel. Compared with conventional carbonyl generation, no toxic gas CO is involved in this work, and volatile Ni(CO)(4) is generated with a single reagent formic acid under the irradiation of UV light (253.7 nm. 15 W). The reaction conditions, including reaction medium, UV irradiation time and reaction temperature, are optimized for the best signal. Under the optimized conditions, a limit of detection of 10 ng L-1 for nickel is obtained without any analyte-pre-concentration, which is comparable to that using in situ trapping technique. interferences from common transition metal ions, noble metal ions and mineral acids are also investigated. The proposed method is applied to the analysis of three certified reference materials and two organic acid samples for trace nickel,with analytical results in good agreement with certified values or those obtained by electrothermal atomic absorption spectrometry. This is a simple, fairly green and highly sensitive method for ultra-trace nickel determination. (C) 2009 Elsevier B.V. All rights reserved.
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