NDLI: Simple hollow fiber liquid membrane based pre-concentration of silver for atomic absorption spectrometry

Content Provider	Royal Society of Chemistry (RSC)
Author	López-López, José Antonio García-Vargas, Manuel Jönsson, Jan Ake Moreno, Carlos
Copyright Year	2014
Abstract	Silver pollution has gained attention in the last few years because silver is being massively used as a bactericide in self-care, medical and textile products. Difficulties of Ag determination are associated with the very low concentrations in which it is normally found (ng L−1) and the nature of the sample matrix. Standard methods such as liquid–liquid extraction (LLE) are regularly used. Alternatively, liquid phase micro-extraction (LPME) appears to be an environmentally friendly tool for sample treatment that offers higher pre-concentration factors. This allows the determination of ultra-trace levels of silver using standard instrumental techniques such as atomic absorption spectrometry. In this work, a hollow fiber LPME is proposed. Silver pre-concentration has been conducted using tri-isobutylphosphine sulphide (TIBPS) as a carrier from the sample to an acceptor solution through a solvent placed in the fiber pores. Accurel-PP 50/280 fibers with an internal volume of 20 μL were used for 50 mL samples. After optimization, 0.1 M KNO3 in the sample, 0.1 M TIBPS in dihexyl ether as the organic phase and 1 M Na2S2O3 in the acceptor solution were established. The system offers enrichment factors of 1053 times, a limit of detection of 1.16 ng L−1. This method improves the limit of detection of the most recent liquid micro-extraction methods for silver pre-concentration coupled with GFAAS, being in this case comparable to ICP-MS detection based techniques.
Starting Page	1462
Ending Page	1467
Page Count	6
File Format	HTM / HTML PDF
ISSN	17599660
Volume Number	6
Issue Number	5
Journal	Analytical Methods
DOI	10.1039/c3ay42024h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Absorption spectroscopy Ether Matrix (chemical analysis) Liquid\u2013liquid extraction GFAAS Solvent Mathematical optimization Bactericide LPME
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Engineering Chemical Engineering

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