RT journal article
T1 Liquid Membranes as a Tool for Chemical Speciation of Metals in Natural Waters: Organic and Inorganic Complexes of Nickel
A1 Vergel, Cristina
A1 Mendiguchía Martínez, Carolina
A1 Moreno Aguilar, Carlos
A2 Química Analítica
K1 natural water
K1 trace metal
K1 nickel
K1 pre-concentration
K1 speciation
K1 liquid membranes
AB The different species of nickel present in natural waters exhibit different transport behaviour through bulk liquid membranes (BLMs). This fact has been used to design and optimise a separation/pre-concentration system applicable to separate labile and non-labile nickel fractions. A hydrazone derivative—1,2-cyclohexanedione bis-benzoyl-hydrazone (1,2-CHBBH) dissolved in toluene/dimethyl formamide (2% DMF)—was used as a chemical carrier of nickel species, from an aqueous source solution (sample) to a receiving acidic solution. Both chemical and hydrodynamic conditions controlling the transport system were studied and optimised. Under optimum conditions, variations in the transport of nickel ions as a function of organic (humic acids) and inorganic (chloride ions) ligands were studied. Relationships between the permeability coefficient (P) or recovery efficiency (%R) and the concentrations of ligands and nickel species were analysed using Winhumic V software. A negative correlation between P and the concentration of organic nickel complexes was found, suggesting that only labile nickel species are transported through the liquid membrane, with non-labile complexes remaining in the water sample; allowing for their separation and subsequent quantification in natural waters.
PB MDPI
SN 2077-0375
YR 2018
FD 2018
LK http://hdl.handle.net/10498/32917
UL http://hdl.handle.net/10498/32917
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026