RT journal article
T1 Electromembrane extraction and capillary electrophoresis with capcitively coupled contactless conductivity detection: multi-extraction capabilities to analyse trace metals from saline samples
A1 Silva García, Macarena
A1 Mendiguchía Martínez, Carolina
A1 Moreno Aguilar, Carlos
A1 Kuban, Pavel
A2 Química Analítica
K1 CE
K1 DEHPA
K1 Electromembrane extraction
K1 Major inorganic cations
K1 Metal cations
K1 Saline samples
AB Simultaneous electromembrane extraction (EME) of six trace metal cations (Cu2+, Zn2+, Co2+, Ni2+, Pb2+, Cd2+) from saline samples was investigated. CE with capacitively coupled contactless conductivity detection (C4D) was used to determine the metals in acceptor solutions due to its excellent compatibility with the minute volumes of acceptor solutions. Bis(2-ethylhexyl)phosphate (DEHPA) was selected as a suitable nonselective modifier for EME transport of target metal cations. Both, the individual effect of each major inorganic cation (Na+, K+, Ca2+, Mg2+) and their synergistic effect on EME of the trace metal cations were evaluated. In both cases, a decrease in extraction efficiency was observed when major inorganic cations were present in the sample. This effect was more significant for Ca2+ and Mg2+. The system was optimized for simultaneous extractions of the six target metals from saline samples (50 mM Na+, 5 mM Mg2+, 1 mM K+, and 1 mM Ca2+) and following EME conditions were applied. Organic phase consisted of 1-nonanol containing 1% (v/v) DEHPA, acceptor solution was 1 M acetic acid (HAc) and sample pH was adjusted to 5. Sample was stirred at 750 rpm and EMEs were carried out at extraction potential of 10 V for 20 min. The method presented a repeatability between 8 and 21.8% (n = 5), good linearity in 0.5–10 μM concentration range (R2 = 0.987-0.999) and LOD better than 2.6 nM. Applicability of the EME–CE–C4D method to the analyses of metal cations in drinking water, seawater, and urine samples was also demonstrated.
SN 0173-0835
YR 2018
FD 2018
LK http://hdl.handle.net/10498/32874
UL http://hdl.handle.net/10498/32874
LA eng
NO This is the pre-peer reviewed version of the following article: Silva, M., Mendiguchía, C., Moreno, C. and Kubáň, P. (2018), Electromembrane extraction and capillary electrophoresis with capacitively coupled contactless conductivity detection: Multi-extraction capabilities to analyses trace metals from saline samples. ELECTROPHORESIS, 39: 2152-2159, which has been published in final form at [https://doi.org/10.1002/elps.201800125]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026