期刊
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
卷 969, 期 -, 页码 123-127出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jchromb.2014.08.010
关键词
Dispersive liquid-liquid microextraction; Solidification of floating organic droplet; Pyrethroid pesticides; Gas chromatography; Tea
资金
- S&T plan projects of Liaoning Provincial Education Department [L2012355]
- Kochi University of Technology Special Scholarship Program
- College students' innovative training program in Liaoning province
A novel ultrasound-assisted dispersive liquid-liquid microextraction based on solidification of floating organic droplet method (UA-DLLME-SFO) combined with gas chromatography (GC) was developed for the determination of eight pyrethroid pesticides in tea for the first time. After ultrasound and centrifugation, 1-dodecanol and ethanol was used as the extraction and dispersive solvent, respectively. A series of parameters, including extraction solvent and volume, dispersive solvent and volume, extraction time, pH, and ultrasonic time influencing the microextraction efficiency were systematically investigated. Under the optimal conditions, the enrichment factors (EFs) were from 292 to 883 for the eight analytes. The linear ranges for the analytes were from 5 to 100 mu g/kg. The method recoveries ranged from 92.1% to 99.6%, with the corresponding RSDs less than 6.0%. The developed method was considered to be simple, fast, and precise to satisfy the requirements of the residual analysis of pyrethroid pesticides. (C) 2014 Elsevier B.V. All rights reserved.
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