期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1351, 期 -, 页码 12-20出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2014.05.038
关键词
Covalent immobilization; Stainless steel wire; Polydopamine; Graphene; Stir bar sorptive extraction
资金
- National Scientific Foundation of China [21375101, 30973672]
- Wuhan Science and Technology Bureau [20140601010057]
- Innovation Seed Fund and Translational Medical Research Fund of Wuhan University School of Medicine
- Fundamental Research Funds for the Central Universities [2012306020203]
Stainless steel wire is a good substrate for jacket-free stir bar sorptive extraction (SBSE). In this work, we present the first example of chemical modification of graphene on stainless steel wire (SSW) for SBSE. Bio-inspired polydopamine was firstly modified on the SSW covalently; then graphene oxide was introduced and reacted with amino groups of polydopamine layer. The modification of polydopamine and graphene can be repeated by a layer-by-layer strategy, resulting in control of the thickness of graphene layer and increase of extraction capability. The prepared covalently immobilized graphene-stainless steel wire (G-SSW) exhibited good stability under stirring, ultrasonication and treatment with commonly used organic solvents, basic and acidic solutions. Application as stir bar for SBSE, G-SSW was found to possess good extraction efficiency towards pollutant polyaromatic hydrocarbons (PAHs), with enrichment factors from 10086 to 16896. After optimization of conditions, G-SSW based SBSE was coupled HPLC for determination of PAHs in environmental and food samples. The quantitative method has low limits of detection of 0.2-50 pg/mL, which is better than some reported SBSE-HPLC methods. The method shows wide linear range (200-5000, 10-1000 and 1-1000 pg/mL), good linearity (r >= 0.9950) and good reproducibility (RSD <= 4.97%). The method has been applied to soil and food samples, with good selectivity and good recoveries ranging from 88.5-113.6%. (C) 2014 Elsevier B.V. All rights reserved.
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