样品基质对单滴微萃取中微滴率的影响

IF 0.9 Q4 CHEMISTRY, MULTIDISCIPLINARY Acta Chimica Slovaca Pub Date : 2020-04-01 DOI:10.2478/acs-2020-0004
N. Kubasová, S. Zichová, Adriána Brisudová, S. Hrouzková
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引用次数: 0

摘要

摘要单滴微萃取由于其简单、高预浓缩因子和低有机溶剂消耗,已成为一种广泛应用的液/液微萃取技术,这是由于将极低体积的提取物直接引入分析系统。确保单滴微萃取具有良好重复性的关键特征包括:溶剂体积、溶剂类型、样品搅拌、盐添加和pH。研究了样品质量对微滴体积和搅拌类型的影响。还研究了样品基质,如水、酸含量样品(橙汁)、含酒精样品(李子白兰地)和蛋白质含量样品(牛奶)对微滴保持的影响。对于水分析,测试了几种有机溶剂,如氯仿、二氯甲烷、四氯甲烷、四氯乙烷和氯苯;后三种方法适用于SDME实验。对于牛奶样品的分析,发现氯苯微滴是最佳的;已经报道了添加盐的优点。对于橙色样品,建议使用1:10稀释,在较低的搅拌速率(100 rpm和250 rpm)下,稳定的微滴体积(甲苯)高达6µL。对于酒精含量的样本,必须考虑真实样本中酒精百分比的变化。基质质量对微滴稳定性的强烈影响已经得到证实。
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Sample matrix influence on microdrop hold-up in single drop microextraction
Abstract Single drop microextraction has become a widespread liquid/liquid microextraction technique owing to its simplicity, high preconcentration factor and low consumption of organic solvents in the extraction due to direct introduction of the very low volume of extract into the analytical system. Crucial features ensuring excellent repeatability of single drop microextraction include: solvent volume, solvent type, sample agitation, salts addition, and pH. The influence of sample quality on the microdrop volume and agitation type was studied. Effect of the sample matrix, such as water, acid content samples (orange juice), sample containing alcohol (plum brandy) and protein content sample (milk), on the microdrop hold-up was also investigated. For water analysis, several organic solvents such as chloroform, dichloromethane, tetrachloromethane, tetrachloroethane and chlorobenzene were tested; last three mentioned were suitable for SDME experiments. For milk samples analysis, chlorobenzene microdrop was found to be optimal; advantage of salt addition has been reported. For orange samples, 1:10 dilution was suggested with stable microdrop volumes (toluene) of up to 6 µL for lower stirring rates (100 rpm and 250 rpm). For alcohol-content samples, the change of alcohol percentage of real-life samples had to be considered. A strong influence of the matrix quality on the microdrop stability has been proven.
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来源期刊
Acta Chimica Slovaca
Acta Chimica Slovaca CHEMISTRY, MULTIDISCIPLINARY-
自引率
12.50%
发文量
11
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