Determination of 266 pesticide residues in apple juice by matrix solid-phase dispersion and gas chromatography-mass selective detection

A macro matrix solid-phase dispersion (MSPD) method was developed to extract 266 pesticides from apple juice samples prior to gas chromatography-mass selective detection (GC-MSD) determination. A 10 g samples was mixed with 20 g diatomaceous earth. The mixture was transferred into a glass column. Pesticide residues were leached with a 160 mL hexane-dichloromethane (1:1) at 5 mL/min. Two hundred and sixty-six pesticides were divided into three groups and detected by GC-MSD under selective ion monitoring. The proposed method takes advantage of both liquid-liquid extraction and conventional MSPD methods. Application was illustrated by the analysis of 236 apple juice samples produced in Shaanxi province China mainland this year. (C) 2004 Elsevier B.V. All rights reserved.

GaAs/AlGaAs MQW材料激子吸收谱的电场效应及pin结构自电光效应器件（SEED)的研究

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利用分子束外延研究GaAs半导体NEA光电发射材料

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Si-GaAs的电学补偿机理及微区均匀性对电子迁移率的影响

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分子束外延Inx-xAs/GaAs失配异质结材料及其性能研究

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GaAs/GaAlAs短周期超晶格中的Wannier-Stark效应

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Si-GaAs中El2的光淬灭效应及有关深能级行为的研究

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分子束外延GaAs/GaP失配异质结材料及其性能研究

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LEC半绝缘GaAs中EL2缺陷的亚稳性和光恢复效应与深能级缺陷的性质

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OTCS自动测试系统及高阻GaAs材料深能级性质的研究

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P2S5/NH4OH对GaAs表面钝化机理的研究

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-04-13T11:45:31Z

小尺寸GaAs MESFET二维数值模拟

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-04-13T11:45:31Z

Si-GaAs注入退火特性的研究

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GaAs/GaAlAs 双区共腔双稳激光器的实验研究及理论分析

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调制掺杂AlGaAs/GaAs异质结构中衬底光激发对导电沟道的作用

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