期刊
TALANTA
卷 78, 期 1, 页码 71-75出版社
ELSEVIER
DOI: 10.1016/j.talanta.2008.10.039
关键词
Silk fibroin; Copper; Solid-phase extraction; Sequential injection; Electrothermal atomic absorption spectrometry
资金
- Natural Science Foundation of China [20575010, 20805004]
- National Science Fund for Distinguished Young Scholars [20725517]
- Major International Joint Research [20821120292]
Silk fibroin is a kind of polypeptide with functional amino acids in its structure. The electric charges in its molecular chains originating from the dissociation of acidic groups, i.e., hydroxyl, phenol and carboxyl, provide vast potentials for the retention of metal species of interest. In this study, the selective retention of Cu2+ with silk fibroin at pH 6.0 was investigated and a novel on-line procedure for separation/preconcentration of Cu2+ from complex sample matrices was thus developed by using a sequential injection system with an electrothermal atomic absorption spectrometry. A novel concept of enrichment index (EI), i.e., defined as enrichment factor (EF) obtained by consuming unity of sample volume (ml), was proposed for evaluating the enrichment efficiency of a flow-based preconcentration procedure. With a sampling volume of 900 mu l, an EI of 30.3 (EF = 27.3) was achieved, which was much improved as compared to that of reported procedures. A detection limit of 8.0 ng l(-1) was achieved within a linear range of 0.025-1.5 mu g l(-1) along with a precision of 2.2% R.S.D. at 0.5 mu g l(-1). The practical applicability of this procedure was validated by analyzing a certified reference material of riverine water (GBW08608) and a certified reference material of seawater (NASS-5) achieving satisfactory agreements between the certified and the obtained values. A spiking recovery was also performed by using a cave water sample. (C) 2008 Elsevier B.V. All rights reserved.
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