期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 57, 期 3, 页码 219-226出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2011.03.005
关键词
Organophosphorus pesticides; Dispersive liquid-liquid microextraction; Supercritical fluid extraction; Marine sediment; Soil
Supercritical fluid extraction (SFE) coupled with dispersive liquid-liquid microextraction (DLLME) and followed by gas chromatography-flame ionization detection (GC-FID) was applied for extraction and determination of ultra-trace amounts of seven organophosphorus pesticides (OPPs) (o,o,o-triethyl phosphorothioate, thionazin, sulfotepp, disulfoton, methyl parathion, parathion, and famphur) in soil and marine sediment samples. Supercritical CO(2) at 150 bar, 60 degrees C, 10 min static and 30 min dynamic extraction times was used to extract the pesticides. The extracts were collected in 1.0 mL of acetonitrile. Seventeen mu L of carbon tetrachloride was dissolved in the collecting solvent and the mixture was then injected rapidly into 5.0 mL of aqueous solution. About (5.0 +/- 0.2 mu L) of sediment phase was collected after centrifuging and finally 2.0 mu L of it was injected into gas chromatography (GC) injection port for analyses. The extraction recoveries for the target analytes were in the range of 44.4% and 95.4% and relative standard deviation (RSD%) for four-replicate measurements was below 7.5%. The limit detections of the method for determining the pesticides were in the range of 0.001-0.009 mg kg(-1). The method was successfully applied for analysis of OPPs in real soil and marine sediment samples and satisfactory results were obtained. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据