Supported liquid membrane technique for time-integrating field sampling of acidic herbicides at sub parts per billion level in natural waters

1992 ◽  
Vol 40 (12) ◽  
pp. 2413-2417 ◽  
Author(s):  
Magnus. Knutsson ◽  
Goeran. Nilve ◽  
Lennart. Mathiasson ◽  
Jan Aake. Joensson
Keyword(s):  
Natural Waters ◽  
Liquid Membrane ◽  
Supported Liquid Membrane ◽  
Field Sampling ◽  
Membrane Technique ◽  
Acidic Herbicides

Selective recovery of uranium from THOREX feed by hollow fibre supported liquid membrane technique containing di(2-ethylhexyl) isobutyramide (D2EHIBA) as the carrier

2010 ◽  
Vol 98 (5) ◽  
Author(s):  
P. N. Pathak ◽  
S. A. Ansari ◽  
D. R. Prabhu ◽  
A. S. Kanekar ◽  
P. K. Mohapatra ◽  
...  
Keyword(s):  
Liquid Membrane ◽  
Feed Solution ◽  
Hollow Fibre ◽  
Supported Liquid Membrane ◽  
Selective Recovery ◽  
Membrane Technique

AbstractHollow fibre supported liquid membrane (HFSLM) studies were carried out for the selective recovery of uranium from THOREX feed solution (0.2 g/L U+200 g/L Th+0.03 M HF+0.1 M Al(NO

scholarly journals Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 88 ◽  
Author(s):  
Clàudia Fontàs ◽  
Enriqueta Anticó ◽  
Victòria Salvadó
Keyword(s):  
Hollow Fiber ◽  
Natural Waters ◽  
Liquid Membrane ◽  
Membrane System ◽  
Mining Area ◽  
Enrichment Factors ◽  
Supported Liquid Membrane ◽  
Analytical Determination ◽  
Fiber System ◽  
Hno3 Solution

A supported liquid membrane-hollow fiber system (HFSLM) has been developed to determine zinc speciation in aquatic environments. The liquid membrane consisted of an organic solution of bis-(2-ethylhexyl)phosphoric acid (D2EHPA) impregnated in the microporous of a polypropylene hollow fiber. The membrane contacted both the donor solution, that contained the metal and the stripping solution, placed in the lumen of the hollow fiber, where the metal was preconcentrated. Different parameters affecting the Zn2+ transport efficiency have been evaluated such as the composition of both the donor and stripping solutions as well as the membrane phase. Extraction and transport efficiencies of free Zn(II) higher than 90% were obtained with a liquid membrane consisting of a 0.1 M D2EHPA solution in dodecane and a 0.1 M HNO3 solution as the stripping phase. The developed HFSLM was used to study the effect of different ligands (EDTA and citric acid) in the donor phase of Zn(II) transport and to investigate the selectivity of the membrane towards Zn when other metals were also present. Finally, the HFSLM system was successfully applied to estimate the free Zn(II) concentrations in three water samples from a mining area. Moreover, the HFSLM system facilitates the analytical determination of trace Zn(II) levels allowing the achievement of enrichment factors of around 700 in the stripping phase.

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