@misc{10498/30365,
year = {2023},
url = {http://hdl.handle.net/10498/30365},
abstract = {Due to its important environmental role, the analysis of trace metals in natural waters is
attracting increasing attention; consequently, faster and more accurate analytical methods are now
needed to reach even lower limits of detection. In this work, we propose the use of electro-membrane
extraction (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 been
developed, using an HFLPME system with di-2-ethylhexyl phosphoric acid (DEHPA) in kerosene as
a chemical carrier, followed by instrumental determination by graphite furnace atomic absorption
spectroscopy (GFAAS). Under optimum conditions, Ni was pre-concentrated 180 +/- 17 times after
15 min, using sample pH = 5.5, the concentration of DEHPA 0.9 M in the liquid membranes, and
1.9 M HNO3 in the acceptor solution, as well as an electric potential of 25 V with the sample being
stirred at 500 rpm. When compared with other HFLPME systems for pre-concentration of trace
Ni 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 was
23.3 ng L-1, and both its applicability and accuracy were successfully evaluated by analyzing Ni
concentration in a seawater-certified reference material (BCR-403), showing the reliability of EME for
sample preparation in the determination of trace metals in marine water samples.},
publisher = {MDPI},
keywords = {electro-membrane extraction},
keywords = {nickel},
keywords = {Seawater},
keywords = {hollow fiber liquid phase micro-extraction},
keywords = {di-2-ethylhexyl phosphoric acid (DEHPA)},
title = {Improvement of Advanced Sample Preparation Systems for the Determination of Trace Ni in Seawater by Electro-Membranes},
doi = {10.3390/membranes13020152},
author = {Pinto Ganfornina, Juan José and Mendiguchía Martínez, Carolina and López López, José Antonio and Martín Barata, Mabel and Silva García, Macarena and Moreno Aguilar, Carlos},
}