請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/35086
標題: Analysis of aqueous pyrethroid residuals by one-step microwave-assisted headspace solid-phase microextraction and gas chromatography with electron capture detection
作者: Li, H.P.
鄭政峰
Lin, C.H.
Jen, J.F.
關鍵字: Microwave heating
Headspace
Solid-phase microextraction
Pyrethroids
Water analysis
induced fluorometry derivatization
polycyclic aromatic-hydrocarbons
mass-spectrometry
organochlorine pesticides
quantitative extraction
fluorescence detection
liquid-chromatography
water
samples
dispersion
期刊/報告no:: Talanta, Volume 79, Issue 2, Page(s) 466-471.
摘要: A one-step microwave-assisted headspace solid-phase microextraction (MA-HS-SPME) has been applied to be a pretreatment step in the analysis of aqueous pyrethroid residuals by gas chromatography (GC) with electron capture detection (ECD). Microwave heating was applied to accelerate the vaporization of pyrethroids (bioallenthrin, bifenthrin, fenpropathrin, cyhalothrin, permethrin, cyfluthrin, cypermethrin, fluvalinate, fenvalerate and deltamethrin) into the headspace, and then being absorbed directly on a SPME fiber under the controlled conditions. Optimal conditions for the SPME sampling, such as the selection of sampling fiber, sample pH, sampling temperature and time, microwave irradiation power, desorption temperature and time were investigated and then applied to real sample analysis. Experimental results indicated that the extraction of pyrethroids from a 20-mL aquatic sample (pH 4.0) was achieved with the best efficiency through the use of a 100-mu m PDMS fiber, microwave irradiation of 157 W and sampling at 30 degrees C for 10 min. Under optimum conditions, the detections were linear in the range of 0.05-0.5 mu g/L with the square of correlation coefficients (R(2)) of >0.9913 for pyrethroids except bifenthrin being 0.9812. Method detection limits (MDL) were found to be varied from 0.2 to 2.6 ng/L for different pyrethroids based on S/N (signal to noise) = 3. The coefficients of variation (CVs) for repeatability were 7-21%. A field underground water sample was analyzed with recovery between 88.5% to 115.5%. This method was proven to be a very simple, rapid. and solvent-free process to achieve the sample pretreatment before the analysis of trace pyrethroids in aqueous samples by gas chromatography. (C) 2009 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/11455/35086
ISSN: 0039-9140
文章連結: http://dx.doi.org/10.1016/j.talanta.2009.04.013
顯示於類別:化學系所

文件中的檔案:
沒有與此文件相關的檔案。


在 DSpace 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。