期刊
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
卷 16, 期 4, 页码 745-755出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10942912.2011.565900
关键词
Single-drop microextraction; Gas chromatography; Organochlorine pesticides; Tea brew
The single drop microextraction method was developed for the determination of ten organochlorine pesticides in tea brews using gas chromatograph-electron capture detector. The optimized parameters for effective extraction required a 2 L drop of n-hexane at the tip of a microsyringe immersed in 5 mL of a diluted tea brew sample for 25 min and stirred at 600 rpm. The limit of detection in the range of 0.01 to 0.025 g/L, with relative standard deviation of repeatability and reproducibility, was in the range of 110 and 824%. The relationship of the measured signal was a linear function (>0.9863) of concentration and the recovery method ranged from 92116%. The single drop microextraction method showed the advantage of being easy to operate, low consumption of organic solvent, and high extraction efficiency.
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