共查询到17条相似文献,搜索用时 78 毫秒
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超临界流体技术应用进展 总被引:12,自引:0,他引:12
超临界流体技术具有许多传统技术所没有的快速、高效、低能耗、污染少等优点。本文综述了其在分离、分析、材料制备和作为反应介质等方面的应用现状。 相似文献
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超临界流体色谱分析番茄红素 总被引:15,自引:0,他引:15
以超临界CO2作为流动相,在压力15.0-20.0MPa,温度25-50℃,携带剂乙醇或正己烷的浓度分别为0-30%和0-20%的范围内考察了番茄红素及其氧化产物在C18色谱柱上的保留值的变化规律,确定了最佳的分离条件。对超临界丙烷萃取的番茄红素原料、萃取产物及萃余物进行了定量分析,考察了重复性及平行性。结果表明:在优化条件下,番茄红素的保留时间在3min以内,定量结果的重复性与平行性好。 相似文献
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超临界流体色谱法在农药分析中的应用 总被引:1,自引:2,他引:1
本文介绍了超临界流体色谱仪器装置的主要部件,对其所用的检测器系统作了较详细的阐述,综述了近年来国外SFC在氨基甲酸酯,拟除虫菊酯,有机磷,有机氯,有机硫及有机氮类等农药分析中的应用情况,展示了该技术在农药分析中广阔前景。 相似文献
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Ulrich van Wasen Issam Swaid Gerhard M. Schneider 《Angewandte Chemie (International ed. in English)》1980,19(8):575-587
In supercritical fluid chromatography (SFC) compressed gases in the region of their critical temperature are used as mobile phases. SFC has important advantages over gas chromatography (GC) for the separation of low-volatile or thermally unstable substances. Like high pressure liquid chromatography (HPLC) and gel chromatography, it is used for various special applications and preparative separations, e.g. in the petroleum industry and in the separation of oligomers. SFC is of great interest in fundamental research on fluid extraction and for the determination of the physicochemical properties of fluid systems. In this contribution the most important physicochemical, methodological, and instrumental principles of SFC are summarized; characteristic physicochemical applications are the determination of capacity ratios, partition coefficients, partial molar volumes, interaction second virial coefficients, and difusion coefficients. 相似文献
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《Analytical letters》2012,45(14):2561-2574
Abstract An HPLC detector was modified to operate as a low pressure on-line supercritical fluid extraction detector. Spectra of CO2 and fluorene are presented of pressures ranging from 85 to 150 atm. Both the intensity and emission wavelength of fluorene were effected by CO2 pressure. As pressure increased, the emission intensity also increased and the emission shifted to a shorter wavelength. The intensity of CO2 emission decreased by increasing pressure. The emission wavelength of CO2 was unaffected by pressure. A detection limit for fluorene was found to be 5 μg per extraction. The minimal detectable mass was 25 μg (± 8% RSD) per extraction. 相似文献
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超临界流体萃取仪器的研制 总被引:1,自引:1,他引:1
本文报道了以国产原配件为基础,成功地研制了分析规模的超临界流体萃取仪器、并对仪器性能进行了全面考察,仪器性能稳定,重现性良好(RSD<3.1%),定量线性关系可靠,可满足定量萃取的要求。 相似文献