RT journal article
T1 Improvement of Advanced Sample Preparation Systems for the Determination of Trace Ni in Seawater by Electro-Membranes
A1 Pinto Ganfornina, Juan José
A1 Mendiguchía Martínez, Carolina
A1 López López, José Antonio
A1 Martín Barata, Mabel
A1 Silva García, Macarena
A1 Moreno Aguilar, Carlos
A2 Química Analítica
K1 electro-membrane extraction
K1 nickel
K1 Seawater
K1 hollow fiber liquid phase micro-extraction
K1 di-2-ethylhexyl phosphoric acid (DEHPA)
AB Due to its important environmental role, the analysis of trace metals in natural waters isattracting increasing attention; consequently, faster and more accurate analytical methods are nowneeded to reach even lower limits of detection. In this work, we propose the use of electro-membraneextraction (EME) to improve analytical methods based on hollow fiber liquid phase micro-extraction(HFLPME). Specifically, an EME-based method for the determination of trace Ni in seawater has beendeveloped, using an HFLPME system with di-2-ethylhexyl phosphoric acid (DEHPA) in kerosene asa chemical carrier, followed by instrumental determination by graphite furnace atomic absorptionspectroscopy (GFAAS). Under optimum conditions, Ni was pre-concentrated 180 +/- 17 times after15 min, using sample pH = 5.5, the concentration of DEHPA 0.9 M in the liquid membranes, and1.9 M HNO3 in the acceptor solution, as well as an electric potential of 25 V with the sample beingstirred at 500 rpm. When compared with other HFLPME systems for pre-concentration of traceNi in seawater in the absence of electric potential, the enrichment factor was improved 2.2 times,while the time of extraction was reduced an 89%. The limit of detection of the new method was23.3 ng L-1, and both its applicability and accuracy were successfully evaluated by analyzing Niconcentration in a seawater-certified reference material (BCR-403), showing the reliability of EME forsample preparation in the determination of trace metals in marine water samples.
PB MDPI
SN 2077-0375
YR 2023
FD 2023
LK http://hdl.handle.net/10498/30365
UL http://hdl.handle.net/10498/30365
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026