A prospective material for the highly selective extraction of lithium ions based on a photochromic crowned spirobenzopyran

2019 ◽  
Vol 7 (6) ◽  
pp. 903-907 ◽  
Author(s):  
Enze Li ◽  
Jin Kang ◽  
Peiyuan Ye ◽  
Weijie Zhang ◽  
Fangqin Cheng ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Salt Lake ◽  
Selective Extraction ◽  
Lithium Ions

The recovery of lithium from salt lake brines with a high Mg/Li ratio continues to be a challenge due to the very similar ionic properties of Li+ and Mg2+ in aqueous solutions.

scholarly journals Extraction of medicinal compounds of the benzodiazepines class from aqueous solutions and their following gas chromatographic determination

2021 ◽  
Vol 57 (2) ◽  
pp. 177-184
Author(s):  
O. N. Mikhniuk ◽  
S. M. Leshchev
Keyword(s):  
Aqueous Solutions ◽  
Chromatographic Determination ◽  
Selective Extraction ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatographic Technique ◽  
Psychotropic Substances ◽  
Quantitative Extraction ◽  
Relative Standard ◽  
Distribution Constants ◽  
The Republic

In extraction systems hexane–water, hexane–aqueous solutions of inorganic salts (sodium chloride, dipotassium phosphate and potassium carbonate), chloroform–water using the method of gas chromatography–mass spectrometry, the distribution constants of psychotropic substances, limited to movement through the customs border of the Republic of Belarus – alprazolam, lorazepam, temazepam, and as well as clozapine, a medicinal product permitted for movement, were determined. The greatest dynamics of the growth of the distribution constant versus salt concentration was observed in alprazolam. It was found that replacing hexane with chloroform leads to increasing the distribution constants and the quantitative extraction of all substances. However, for the selective extraction of substances from various objects and the simultaneous removal of matrix components, it is necessary to use the systems as hexane–aqueous solutions of salts or hexane–water. Based on the obtained values of the distribution constants of substances, extraction-chromatographic technique for the determination of organic non­electrolytes (benzodiazepines) in various objects is proposed. Metrological characteristics of the techniques are: relative standard deviation does not exceed 2 %, the range of determined concentrations in solutions is 0,05– 1,00 g/dm3.

A novel In(III) ion-imprinted polymer (IIP) for selective extraction of In(III) ions from aqueous solutions

2018 ◽  
Vol 176 ◽  
pp. 243-252 ◽  
Author(s):  
Min Li ◽  
Xiaojing Meng ◽  
Xiuke Liang ◽  
Jinhai Yuan ◽  
Xinju Hu ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Selective Extraction ◽  
Ion Imprinted Polymer ◽  
Imprinted Polymer ◽  
Ion Imprinted

7Li-MR Studies on Molecular Motion of Hydrated Lithium Ions in Concentrated Aqueous Solutions of LiCl, LiBr, and LiSCN at Low Temperatures

1995 ◽  
Vol 50 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Tooru Hasebe ◽  
Kazuko Tanaka
Keyword(s):  
Aqueous Solutions ◽  
Dynamic Properties ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Electric Quadrupole ◽  
Spin Lattice Relaxation ◽  
Glass Transition Point ◽  
Electric Quadrupole Interaction ◽  
Lithium Ions ◽  
Concentrated Aqueous Solutions

Abstract Nuclear spin-lattice relaxation times, T1, of 7Li in 13.8mol/kg LiCl-H2O and 12.3 mol/kg LiCl-D2O solutions have been measured in the temperature range 80K-313K. They showed similar temperature dependences with the same minimum values (27 ± 1 ms) which proved that the electric quadrupole interaction is dominant for the relaxation of 7Li-NMR. The T1 and T2 values of 7Li-NMR in concentrated aqueous solutions of LiCl (8-14 mol/kg), LiBr (8-10 mol/kg) and LiSCN (8-14 mol/kg) at 80 K to 300 K have been studied to obtain information concerning the dynamic properties of Li+ ions and the effect of anions. T1 at temperatures higher than the glass transition point is governed by a tumbling motion of the hydrated lithium ions.

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