共查询到19条相似文献,搜索用时 265 毫秒
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离子液体在固相微萃取中的应用进展 总被引:1,自引:0,他引:1
由于具有黏度大、蒸汽压低、热稳定性好、设计灵活、环境友好等特点,离子液体可被应用于固相微萃取技术中。离子液体固相微萃取结合了液相微萃取和固相微萃取的特点,是一种高效的样品前处理技术。本文主要从离子液体在固相微萃取中的不同存在形式和作用方面综述了近年来离子液体在固相微萃取技术中的应用进展,并对其发展方向进行了展望。 相似文献
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固相萃取技术及其在环境分析中的应用 总被引:7,自引:0,他引:7
固相萃取是近年来发展较快的样品预处理技术,本文主要阐述了固相萃取技术的基本原理以及方法,简述了固相萃取技术的发展状况,并介绍了该技术在环境分析中的应用。 相似文献
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综述了利用固相萃取柱、固相萃取膜、固相微萃取三种固相萃取技术检测环境水样中多环芳烃的方法,并对其发展趋势进行了展望. 相似文献
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固相微萃取是近十年来发展起来的新型分离富集技术,简便快速、无污染、易于和其它技术联用。文中对固相微萃取的装置原理、涂层材料、涂渍技术、萃取方式及其在分析检测样品预处理中的应用发展方向进行了探讨。 相似文献
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综述了近年来食品中抗生素残留的前处理分析方法。分别对固相萃取、基质固相分散、固相微萃取、超临界流体萃取以及近年来发展起来的新技术如微波萃取、溶剂萃取等进行了讨论,并对抗生素残留检测的前处理技术发展前景进行了展望。 相似文献
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固相微萃取(SPME)是近年来在固相萃取基础上发展起来的崭新的萃取分离技术。这项技术是一种简便快捷的样品前处理技术,不需要有机萃取剂,是一种环境友好的萃取过程。介绍了固相微萃取技术的萃取原理、萃取过程以及在水环境监测中的应用。 相似文献
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分子印迹技术在固相萃取中的应用与展望 总被引:12,自引:0,他引:12
20世纪90年代以来,具有构效预定性、特异识别性和广泛实用性等特点的分子印迹技术在异构体及手性分离、化学仿生传感器、模拟酶催化、膜分离及固相萃取等领域的研究较多. 固相萃取技术作为一种比液液萃取更好、更快速、更简便的分离技术,是近30年来才快速发展起来的.以印迹聚合物作为固相萃取填料是分子印迹技术最具应用前景的一个方向.对分子印迹技术及固相萃取技术的基本原理及方法进行了简单介绍,并着重介绍了近年来分子印迹技术在固相萃取中的应用,如环境样品分析、药物分离与分析、生物与临床医学检测等,并对两种技术结合取得的成果、面临的问题及应用前景进行了展望. 相似文献
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Maurizio Servili Maura Baldioli Roberto Selvaggini Enrico Miniati Alceo Macchioni Gianfrancesco Montedoro 《Journal of the American Oil Chemists' Society》1999,76(7):873-882
Phenolic compounds are the most important antioxidants of virgin olive oil. This paper reports on the application of solid
phase extraction (SPE) in the separation of phenolic compounds from olive fruit, olive oil, and by-products of the mechanical
extraction of the oil and the complete spectroscopic characterization by nuclear magnetic resonance of demethyloleuropein
and verbascoside extracted from olive fruit. SPE led to a higher recovery of phenolic compounds from olives than did liquid/liquid
extraction. SPE also was used to separate phenolic compounds from pomaces and vegetation waters. Phenylacid and phenyl-alcohol
concentrations in extracts obtained from SPE and liquid/liquid extraction were not significantly different (P<0.05). The recovery of the dialdehydic form of elenolic acid linked to 3,4-(dihydroxyphenyl)ethanol and an isomer of oleuropein
aglycon, however, was low. 相似文献
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增塑剂污染严重凸显对其监测的必要性,痕量邻苯二甲酸酯增塑剂需要在测试前进行富集预处理。固相萃取技术是一种净化和富集相结合的新型样品预处理技术,也是目前在环境样品测试中使用最广泛的预处理新技术。本文结合其在邻苯二甲酸酯类化合物分析中的应用对该技术的原理、固定相类型、效率影响因素和柱性能考察作了介绍。 相似文献
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介绍了近年来出现的超临界流体萃取、加速溶剂萃取、凝胶渗透色谱、固相萃取、固相微萃取、基质固相分散萃取等前处理技术,以及它们在农药残留分析中的应用,并对其发展前景进行了展望。 相似文献
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SPME联用GC/ECD测定饮水中氯酚 总被引:4,自引:0,他引:4
固相微萃取(SPME)是国际上1990s新发展起来的一项样品前处理技术。氯酚类化合物是环境中广泛存在的有机污染物,其中2,4-二氯酚(DCP),2,4,6-三氯酚(TCP)和五氯酚(PCP)已被列为我国水体中优先控制物[3]和饮用水控制标准。国家现行饮用水检测标准方法中样品前处理采用固相萃取(SPE)法。本研究应用SPME联用GC/ECD检测饮水中3种氯酚,讨论实验条件对分析的影响,并和SPE法进行比较。表明SPME法在检测限、精密度、操作性等方面优于现行标准方法。 相似文献
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《Carbon》2014
A novel mixed hemimicelles solid phase extraction (SPE) based on magnetic carbon nanotubes (MCNTs) and ionic liquid (IL) is developed for the simultaneous extraction and determination of trace flavonoids in spiked human urine. In this novel SPE, the formation of C16mimBr with mixed hemimicelles on the surface of MCNTs@SiO2 nanoparticles (NPs) causes retention of analytes by strong hydrophobic, π–π and electrostatic interactions. This SPE technique combines the advantages of mixed hemimicelles and MCNTs. In order to establish the guidelines for the preparation of mixed hemimicelles on composite materials, different main factors affecting the preconcentration of analytes, such as material type, amount of surfactant, pH of solution, ionic strength, extraction time, desorption condition and regeneration property, were investigated and optimized. Under the selected conditions, the accuracy of the method was evaluated by recovery measurements on spiked samples, and good recoveries with low relative standard deviations from 3.5% to 4.9% were achieved. No interferences were caused by endogenous compounds in human urine. For our knowledge, this is the first development of a mixed hemimicelles SPE based on MCNTs and IL for the extraction of trace analytes in complex biological samples. 相似文献
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J. Ward Hills 《溶剂提取与离子交换》2013,31(2):347-359
ABSTRACT Extraction techniques for semi-volatile organic compounds from caustic and high ionic strength solutions are presented. It is demonstrated that simple liquid-liquid extraction from a high ionic strength aqueous solution can allow inorganic ions to partition from the aqueous phase into the organic extraction phase. The ability of solid-phase extraction (SPE) adsorbents to separate organic target compounds from a sample, without significant carry-over of inorganic material, is compared to that of Liquid-liquid extraction. The most useful SPE media was a commercially available alumina substrate coated with a robust non-polar phase. Extractions of three compound classes, are presented: aromatic, alkyl hydrocarbons and alkyl phosphates. Extraction yields ranged from 42 to 97.6% (6-12% RSD). The range of yields for each chemical class was 7.5-79.9%, 14.3-68.3% and 91.1-97.6% for the aromatic, alkyl hydrocarbons and alkyl phosphate compounds respectively. 相似文献