分散液液微萃取在测定水样品有机污染物的应用研究

发布时间：2018-05-03 20:17

本文选题：分散液液微萃取 + 有机污染物　；参考：《兰州大学》2015年硕士论文

【摘要】：随着分析技术的不断发展,高效、便捷的样品前处理技术在实际样品中的应用也越来越广泛,但是无论如何人们总是很难在实际样品中获得和理想样品一样的回收率。而这些归结于实际样品中的复杂性基质如蛋白质等,它们改变了目标分析物分子的存在状态从而形成的基质干扰效应。由于离子液体(IL)优异的理化性质,正逐渐作为一种新兴的绿色溶剂而被广泛地应用于样品前处理技术中。本论文将离子液体-分散液液微萃取法(IL-DLLME)用于检测环境水中有机污染物,具体内容如下：1.建立了超声辅助离子液分散液液微萃取测定环境水样中苯胺类化合物的方法。以最常用的烷基咪唑六氟磷酸盐类离子液体为萃取剂,通过超声加速萃取剂的分散程度,提高了萃取效率。该方法的检测限达到0.1-73 ng mL-1,对于苯胺(AN)、对氟苯胺(4-FA)、对硝基苯胺(4-NA)、对氯苯胺(4-CA)四种苯胺化合物而言,黄河水和自来水中的加标回收率均在90.5-113.3%之间,呈现良好的回收效果。2.以几种典型的纳米颗粒和表面活性剂作为基质来探究上述所建立的分散萃取方法对苯胺及多环芳烃的萃取回收率的影响,分别考察了纳米颗粒的浓度、种类、不同目标分析物的浓度、不同表面活性剂的种类以及浓度对萃取结果的影响。结果表明纳米材料会影响小浓度分析物的萃取效果。3.为了提高分子印迹聚合物(MIP)在水体系中的印迹因子,本章研究了IL对纳米分子印迹材料的分散萃取效果的影响。优化了分子迹印迹材料的类型,并对比了IL-DLLME、IL-MIP-DLLME以及MIP-μSPE三种萃取模式,考查了不同萃取模式对模板分子磺胺甲基嘧啶的选择性和富集能力。初步研究结果表明,在我们的预实验条件下,添加的IL对MIP的印迹能力影响不大。
[Abstract]:With the development of analytical technology, the efficient and convenient sample pretreatment technology is more and more widely used in practical samples, but in any case, it is difficult to obtain the same recovery rate as ideal samples in real samples. These can be attributed to the complex matrix such as protein in the actual sample, which changes the state of the target analyte molecule and forms the matrix interference effect. Due to the excellent physical and chemical properties of ionic liquid (ILL), it has been widely used in sample pretreatment technology as a new green solvent. In this paper, ionic liquid-dispersible liquid microextraction method (IL-DLLME) was used to detect organic pollutants in environmental water. The contents are as follows: 1. A method for the determination of aniline compounds in environmental water samples by ultrasonic assisted ion liquid dispersive liquid microextraction was established. The extraction efficiency was improved by ultrasonic acceleration of the dispersing degree of alkyl imidazolium hexafluorophosphate ionic liquid as extractant and the most commonly used ionic liquid of alkyl imidazole hexafluorophosphate as extractant. The detection limit of this method is 0.1-73 ng mL ~ (-1). For aniline, p-fluoroaniline 4-FAA, p-nitroaniline 4-NAN, p-chloroaniline 4-CA), the recoveries of the four aniline compounds in the Yellow River water and tap water are between 90.5-113.3%, showing a good recovery rate of 0.2%. Several typical nanoparticles and surfactants were used as the matrix to study the effect of the dispersion extraction method on the extraction recovery of aniline and polycyclic aromatic hydrocarbons (PAHs). Effects of concentration of different target analytes, kinds of surfactants and concentrations on extraction results. The results showed that nanomaterials could affect the extraction effect of small concentration analytes. In order to improve the imprinting factor of molecularly imprinted polymer (MIP) in water system, the effect of IL on the dispersion and extraction of nano-molecularly imprinted materials was studied in this chapter. The types of molecular trace imprinting materials were optimized, and the three extraction modes of IL-DLME-IL-MIP-DLLME and MIP- 渭 SPE were compared, and the selectivity and enrichment ability of different extraction modes to the template molecule sulfamethazine were investigated. The preliminary results showed that the addition of IL had little effect on the imprinting ability of MIP under our preexperimental conditions.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X832

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