RT journal article
T1 Three phase solvent bar micro-extraction as  an approach to silver ultra-traces speciation  in estuarine water samples
A1 López López, José Antonio
A1 Herce Sesa, Belén
A1 Moreno Aguilar, Carlos
A2 Química Analítica
K1 Silver
K1 Trace analysis
K1 Speciation
K1 Estuary
K1 Three-phase
K1 solvent bar
K1 micro-extraction
AB Silver ion inputs into the environment due to human activities have been increased in the last years because it has been used as a bactericide with application in medical, homecare and self-care products. In addition, it is toxic at low concentration for aquatic organisms. In estuarine waters, salinity and dissolved organic matter (DOM) regulate Ag+ concentration by the formation of complexes as AgCln(n-1)− and Ag-DOM.Difficulties of Ag+ analysis in estuaries are associated to its low concentration level and interferences of sample matrix. Liquid and solid phase extraction methods have been used for speciation of silver in waters; however, miniaturized methods that offer a better environmental profile are desirable. Hollow fiber liquid phase micro-extraction (HFLPME) allows obtaining higher pre-concentration factors with a reduction of waste generation. Notwithstanding, some operational improvements are needed to permit their use as a routine method that can be afforded using a configuration of three-phase solvent bar micro-extraction (3PSBME).In this work, tri-isobutylphosphine sulphide (TIBPS) has been used as an extractant for Ag+ pre-concentration in estuarine waters by 3PSBME. Under optimized conditions, Ag+ has been pre-concentrated 60 times and the method presents a limit of detection of 1.53 ng L−1. To evaluate which Ag species is transported by TIBPS, Cl− and DOM have been added to synthetic samples. As a result, a decrease in Ag pre-concentration efficiency after additions has been observed and quantified. Results showed that Ag+ is selectively transported by TIBPS from estuarine water samples after comparison of the results with those obtained by the reference method of liquid extraction with APDC/DDDC.
PB Elsevier
SN 0039-9140
YR 2015
FD 2015
LK http://hdl.handle.net/10498/33061
UL http://hdl.handle.net/10498/33061
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026