RT journal article
T1 Ionic liquid based solvent micro-extraction of Ag and Cd from saline and hypersaline waters
A1 Herce Sesa, Belén
A1 López López, José Antonio
A1 Pinto Ganfornina, Juan José
A1 Moreno Aguilar, Carlos
A2 Química Analítica
K1 silver
K1 cadmium
K1 seawater
K1 hyper-saline waters
K1 ionic liquid,
K1 solvent bar extraction
AB Cadmium (Cd) and silver (Ag) are naturally occurring metals in saline natural waters,which may present toxic effects even at trace level. Membrane technology has beenwidely applied for their extraction, including hollow fiber supported liquid membranes.However, their application to saline waters is limited. In this work, a hollow fiber liquidmicro-extraction system, with a configuration of 2 phase solvent bar micro-extraction(2SBME), using the ionic liquid N-methyl-N,N,N-trioctylammonium chloride(Aliquat® 336), dissolved in kerosene as extractant is proposed to overcome thelimitations of existing HFLPME of Ag and Cd in saline waters.The use of an ionic liquid solution in the 2SBME leaded to higher stability of theorganic solution in the fiber. The effect of chemical variables on the extraction wasevaluated. Extraction of Cd and Ag with Aliquat® 336 was enhanced by Cl- in thesample, but it was independent of the concentration of organic matter. Extraction yieldvaried in the range 65-80% for Ag, and 45%-95% for Cd, depending on the salinity ofsamples. The highest extraction was obtained in seawater samples for 75% Aliquat®336 dissolved in kerosene with 10% dodecan-1-ol, after 45 minutes, and 800 rpmstirring rate in the sample. Efficacy of the proposed system when applied to real samples was 88.10±4.14% for Cd, and 61.47±3.00% for Ag in seawater, and92.73±5.37% for Cd and 64.23±2.85% for Ag in a hyper-saline lagoon (70 g L-1 NaCl).In conclusion, the proposed methodology allowed a miniaturization of Ag and Cdextraction in short times, requiring lower amount of reagents and solvents, less energyas well as reducing operational cost and wastes if compared with existing liquidmembrane based methods.
PB Elsevier
SN 1385-8947
YR 2017
FD 2017
LK http://hdl.handle.net/10498/32457
UL http://hdl.handle.net/10498/32457
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026