化学
净化
萃取(化学)
色谱法
气相色谱法
分析物
热电冷却
分析化学(期刊)
温度控制
样品制备
热电效应
废物管理
物理
控制工程
工程类
热力学
作者
Xiangfan Piao,Jinhu Bi,Chengyue Yang,Xiaoping Wang,Juan Wang,Donghao Li
出处
期刊:Talanta
[Elsevier]
日期:2011-10-01
卷期号:86: 142-147
被引量:24
标识
DOI:10.1016/j.talanta.2011.08.047
摘要
► An automatic temperature control system was developed here. ► The wide ranges of stable heating and cooling temperatures were achieved using micro-heater and thermoelectric cooler, respectively. ► It was applied to “Gas purge microsyringe extraction (GP-MSE)” system. ► The quantitative extraction recoveries were obtained within 3 min. The gas purge microsyringe extraction (GP-MSE) technique offers quantitative and simultaneous extraction, and rapid gas chromatographic–mass spectrometric determination of volatile and semivolatile chemicals is possible. To simplify the application, a new automatic temperature control system was developed here. Stable heating and cooling over a wide range of temperatures were achieved using a micro-heater and thermoelectric cooler under varying gas flow conditions. Temperatures could be accurately controlled in the range 20–350 °C (heating) and 20 to −4 °C (cooling). Temperature effects on the extraction performance of the GP-MSE were experimentally investigated by comparing the recoveries of polycyclic aromatic hydrocarbons (PAHs) under various experimental conditions. A sample treatment was completed within 3 min, which is much less than the time required for chromatographic analysis. The recovery of chemicals determined ranged from 81 to 96%. High reproducibility data (RSD ≤ 5%) were obtained for direct extraction of various analytes in spiked complex plant and biological samples. The data show that the heating and cooling system has potential applications in GP-MSE system for the direct determination of various kinds of volatile and semivolatile chemicals from complex matrices without any, or only minor, sample pretreatment.
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