RT journal article
T1 Coupled Extraction/Re-Extraction Method for the Chemical Speciation of Nickel in NaturalWaters
A1 Mendiguchía Martínez, Carolina
A1 Vergel Rodríguez, Cristina
A1 Moreno Aguilar, Carlos
A2 Química Analítica
K1 natural waters
K1 extraction
K1 re-extraction
K1 liquid membrane
K1 metals
K1 nickel
K1 speciation
K1 fractionation
K1 labile
K1 non-labile
AB Chemical fractionation and speciation of metals species in natural waters and its relationwith bioavailability have received increased attention in recent years. A simple liquid membranesmethod, based on coupled liquid extraction and re-extraction processes, is proposed to separate andquantify the species of nickel present in water samples. A simplex optimization of chemical variables,such as carrier concentration in the organic solution and nitric acid concentration in the receivingsolution, was performed and, under optimized conditions, the extraction system was applied todetermine nickel species in water samples at natural level concentrations. A linear relationshipwas established between extraction e cacy and the concentration of dissolved organic carbon inthe samples, allowing the separation and determination of labile and non-labile nickel fractions,since the latter was not transported through the organic solution acting as liquid membrane. When thetotal and labile concentrations of metals were analyzed in real samples with di erent salinities,no significant di erences were found between the results obtained and those from well-establishedmethods. An average relative error of 1.50 and 2.37 was obtained for total Ni concentration andlabile fraction, respectively. Finally, a comparison with the theoretical speciation data calculatedwith the softwareWinHumic V was successfully performed. Thus, the proposed method allows thesimultaneous determination of labile and non-labile nickel fractions, presented as a simple alternativeto nickel fractionation in natural waters.
PB MDPI
SN 2076-3417
YR 2020
FD 2020-01
LK http://hdl.handle.net/10498/22519
UL http://hdl.handle.net/10498/22519
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 13-nov-2026