scholarly journals Determination of the Lewis acidity of amide–AlCl3 based ionic liquid analogues by combined in situ IR titration and NMR methods

RSC Advances ◽  
2018 ◽  
Vol 8 (24) ◽  
pp. 13248-13252 ◽  
Author(s):  
Pengcheng Hu ◽  
Wei Jiang ◽  
Lijuan Zhong ◽  
Shu-Feng Zhou
Keyword(s):  
Ionic Liquid ◽  
Lewis Acidity ◽  
Nmr Analysis ◽  
In Situ Ir ◽  
Nmr Methods

The Lewis acidic strength and amount of amide–AlCl3 IL analogues are determined by the combination of in situ IR titration and NMR analysis.

An in-situ extraction–preconcentration method using ionic liquid-based surfactants for the determination of organic contaminants contained in marine sediments

Talanta ◽  
2012 ◽  
Vol 99 ◽  
pp. 972-983 ◽  
Author(s):  
Bárbara Delgado ◽  
Verónica Pino ◽  
Jared L. Anderson ◽  
Juan H. Ayala ◽  
Ana M. Afonso ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Marine Sediments ◽  
Organic Contaminants ◽  
In Situ Extraction ◽  
Preconcentration Method ◽  
Extraction Preconcentration

Monitoring an ionic liquid synthesis with in-situ IR-spectroscopy – The intricacy of solvent effects

2019 ◽  
Vol 368 ◽  
pp. 649-658 ◽  
Author(s):  
Andreas Ohligschläger ◽  
Christoph Gertig ◽  
Dario Coenen ◽  
Sebastian Brosch ◽  
Dzmitry Firaha ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ir Spectroscopy ◽  
Solvent Effects ◽  
In Situ Ir ◽  
In Situ Ir Spectroscopy

Task-specific ionic liquid based in situ dispersive liquid–liquid microextraction for the sequential extraction and determination of chromium species: optimization by experimental design

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 60621-60629 ◽  
Author(s):  
Susan Sadeghi ◽  
Ali Zeraatkar Moghaddam
Keyword(s):  
Ionic Liquid ◽  
Absorption Spectrometry ◽  
Selective Extraction ◽  
Chromium Species ◽  
Flame Atomic Absorption ◽  
Dispersive Liquid Liquid Microextraction ◽  
Task Specific Ionic Liquid ◽  
Liquid Microextraction

An optimised task specific ionic liquid-basedin situdispersive liquid–liquid microextraction (in situTSIL-DLLME) with flame atomic absorption spectrometry (FAAS) methodology was developed for the selective extraction of Cr(iii) and Cr(vi) species.

scholarly journals Determination of Very Low Concentration of Bisphenol A in Toys and Baby Pacifiers Using Dispersive Liquid–Liquid Microextraction by In Situ Ionic Liquid Formation and High-Performance Liquid Chromatography

2020 ◽  
Vol 13 (10) ◽  
pp. 301
Author(s):  
Yesica Vicente-Martínez ◽  
Manuel Caravaca ◽  
Antonio Soto-Meca
Keyword(s):  
Ionic Liquid ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
The Body ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction ◽  
Total Extraction

Bisphenol A (BPA) is a chemical compound used in the manufacturing of plastics and resins whose presence in the body in low concentrations can cause serious health problems. Due to this, there is a growing interest in the scientific community to develop analytical methods that allow quantifying trace concentrations of BPA in different types of samples. The determination of this compound in toys made of plastics that can be manipulated by children leads to an extra concern, because it is possible for BPA to enter the body by introducing these toys into the mouth. This work presents a novel procedure to the quickly and easily quantification of trace levels of BPA in samples of toys and pacifiers according to the current demanding regulations. The determination of very low levels of BPA was carried out by ionic liquid dispersive liquid–liquid microextraction (IL-DLLME) followed by high-performance liquid chromatography (HPLC). The formation in situ of the ionic liquid (IL) 1-octyl-3-methylimidazolium bis((trifluoromethane)sulfonyl)imide ([C8MIm] [NTf2]), was achieved by mixing 1-octyl-3-methylimidazolium chloride ([C8MIm]Cl) and lithium bis(trifluoromethanesulfonyl)imide ([NTf2]Li) aqueous solutions, reaching an instant dispersion whose cloud of microdrops allows the total extraction of BPA in the IL from aqueous solutions. After centrifugation, BPA concentration in the sedimented phase was determined by HPLC. The optimal experimental conditions for the microextraction and determination of BPA in the IL were studied. The total extraction was achieved at pH 4, heating the sample at 30 °C for 5 min, using 100 µL of IL precursor volume, and spinning after the formation of dispersion at 3000 rpm for 10 min. The enrichment factor (EF) and detection limit (LOD) reached with the procedure were 299 and 0.19 µg L−1, respectively. The relative standard deviation for ten replications at the 0.5 µg L−1 level was 5.2%. Recovery studies showed a mean value for BPA recovery percentage in the samples of 99%. Additionally, a hybrid model was applied to characterize the extraction kinetics. This simple, low cost and fast method simplifies traditional microextraction techniques, representing an outstanding alternative.

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