【摘 要】
：
A rapid method based on matrix solid phase dispersion (MSPD) and gas chromatography-tandem mass spectrometry (GC-MS/MS) was proposed for the determination 13 organophosphorus pesticides (phorate, dime
【机 构】
：
Department of Chemistry and The Key Laboratory of Analytical Sciences of the Ministry of Education,
【出 处】
：
DaLian Internationall Symposia and Exhibition on Chromatogra
论文部分内容阅读
A rapid method based on matrix solid phase dispersion (MSPD) and gas chromatography-tandem mass spectrometry (GC-MS/MS) was proposed for the determination 13 organophosphorus pesticides (phorate, dimethoate, diazinon, methyl-chlorpyrifos, disulfoton, methyl-parathion, fenchlorphos, fenitrothion, chlorpyrifos, fenthion, parathion, bromophos, ethion) in commercial milk samples.After the optimization of different parameters such as the type of adsorbent, the extraction solvent, the group of pesticides was added to milk samples and blended with 8% deactivation neutral alumina, pesticides were extracted from the mixture with acetonitrile in an ultrasonic bath, then the liquor was filtered by filter paper for analysis by GC-MS/MS and with etroprophos as internal standard.Electron impact ionization and chemical ionization were employed in a single analysis for the determination of pesticides according to the differernt sensitivity of pesticides.Recovery studies were performed at 50 and 200 μtg/kg fortification levels for each pesticide, and the recoveries ranged from 70.4% to117.6% with a relative standard deviation between 0.8% and 18.6% for the different pesticide.The detection limit of the method was less than 4.8 μg/kg for the pesticides.The developed method was linear over the range assayed, 25-500 μg/kg, with determination coefficients > 0.995.The proposed method was applied to the analysis of these organophosphorus pesticides in commercial milk samples.
其他文献
Superose 12 column, which is filled with the 12% cross-linked agarose gel, is often used to separate and purify high molecular weight compounds.The application of this matrix for isolation and purific
Hyphenated techniques such as GC or LC combined with mass spectrometry provide a unique combination of separation and detection power.With its ease-of-use and lower cost, GC/MS and LC/MS with single q
The rapidly growing interest in the area of proteomics induces intensive efforts to find robust, automated and sensitive high-throughput analytical tools.One of the key advancements in rapid protein i
To understand biology at system level, examining the structure and dynamic changes under different status can gain more insights than characterizing isolated pathways of cells or organisms.Rheumatoid
Methylation is an important pathway and occurs ubiquitously in diverse biochemical reaction processes.Recently, the results from several investigations have revealed a possible relationship between me
Vitexin-2"-O-rhamnoside (VOR) is one of components of flavonoid of the leaves of Crataegus pinnatifida Bge.var major N.E.Br.[1], which has been demonstrated to strongly inhibit DNA synthesis in MCF-7
The qualitative and quantitative methods were established by studying on Baeckea frutescens L., which provided a reliable technique for the establishment of the quality standard of Baeckea frutescens
Zingiber officinale rosc.and rhizome of aplinia officinarumboth are of values in health food and traditional Chinese medicine.The volatile oils from them have been reported to have various activities.
A gas chromatographic analytical method for the determination of 3-octanone in occupational atmospheres was developed based on the criterion of WS 1-1996.Air samples are collected in silica gel solid