本文選題：分散液液微萃取 + 有機污染物　； 參考：《蘭州大學(xué)》2015年碩士論文

【摘要】：隨著分析技術(shù)的不斷發(fā)展,高效、便捷的樣品前處理技術(shù)在實際樣品中的應(yīng)用也越來越廣泛,但是無論如何人們總是很難在實際樣品中獲得和理想樣品一樣的回收率。而這些歸結(jié)于實際樣品中的復(fù)雜性基質(zhì)如蛋白質(zhì)等,它們改變了目標(biāo)分析物分子的存在狀態(tài)從而形成的基質(zhì)干擾效應(yīng)。由于離子液體(IL)優(yōu)異的理化性質(zhì),正逐漸作為一種新興的綠色溶劑而被廣泛地應(yīng)用于樣品前處理技術(shù)中。本論文將離子液體-分散液液微萃取法(IL-DLLME)用于檢測環(huán)境水中有機污染物,具體內(nèi)容如下：1.建立了超聲輔助離子液分散液液微萃取測定環(huán)境水樣中苯胺類化合物的方法。以最常用的烷基咪唑六氟磷酸鹽類離子液體為萃取劑,通過超聲加速萃取劑的分散程度,提高了萃取效率。該方法的檢測限達(dá)到0.1-73 ng mL-1,對于苯胺(AN)、對氟苯胺(4-FA)、對硝基苯胺(4-NA)、對氯苯胺(4-CA)四種苯胺化合物而言,黃河水和自來水中的加標(biāo)回收率均在90.5-113.3%之間,呈現(xiàn)良好的回收效果。2.以幾種典型的納米顆粒和表面活性劑作為基質(zhì)來探究上述所建立的分散萃取方法對苯胺及多環(huán)芳烴的萃取回收率的影響,分別考察了納米顆粒的濃度、種類、不同目標(biāo)分析物的濃度、不同表面活性劑的種類以及濃度對萃取結(jié)果的影響。結(jié)果表明納米材料會影響小濃度分析物的萃取效果。3.為了提高分子印跡聚合物(MIP)在水體系中的印跡因子,本章研究了IL對納米分子印跡材料的分散萃取效果的影響。優(yōu)化了分子跡印跡材料的類型,并對比了IL-DLLME、IL-MIP-DLLME以及MIP-μSPE三種萃取模式,考查了不同萃取模式對模板分子磺胺甲基嘧啶的選擇性和富集能力。初步研究結(jié)果表明,在我們的預(yù)實驗條件下,添加的IL對MIP的印跡能力影響不大。
[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.
【學(xué)位授予單位】：蘭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X832

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