Automatic heating and cooling system in a gas purge microsyringe extraction

作者：Piao Xiangfan; Bi Jinhu; Yang Cui; Wang Xiaoping; Wang Juan; Li Donghao^*

来源：Talanta, 2011, 86: 142-147.

DOI：10.1016/j.talanta.2011.08.047

• Microextraction
• Heating
• Cooling
• Gas purge
• GC-MS

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 degrees C (heating) and 20 to -4 degrees 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.

• 出版日期2011-10-30
• 单位延边大学