期刊
ANALYTICAL LETTERS
卷 46, 期 6, 页码 1012-1024出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2012.745086
关键词
Chloroacetanilide herbicides; Gas chromatography; Magnetic graphene nanocomposite; Magnetic solid-phase extraction
资金
- National Natural Science Foundation of China [31171698]
- Hebei province science and technology support program [12396908D]
A highly sensitive method for the determination of the chloroacetanilide herbicides alachlor, acetochlor, pretilachlor, butachlor, and metolachlor in environmental water samples was developed. It is based on solid-phase extraction using magnetic graphene nanocomposite (G-Fe3O4) as the adsorbent, followed by gas chromatography with electron capture detection. This novel adsorbent showed a great adsorptive ability toward the analytes. The main experimental parameters such as the amount of G-Fe3O4, extraction time, ionic strength, the pH of the sample solution, and desorption conditions were optimized. Under the optimum conditions, the enrichment factors of the method for the analytes were in the range from 649 to 1078. A good linear response was achieved in the range of 0.220.0ngmL1, with correlation coefficients (r) varying from 0.9964 to 0.9998. The limits of detection of the method ranged from 0.02 to 0.05ngmL1 and the relative standard deviations were below 4.5%. The method was successfully applied to the determination of the herbicides in environmental water samples. Recoveries of the method for the analytes were in the range of 80.7105.3%.
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