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SKAM 27
Johor Bahru, Malaysia, 9-10 December 2014
Functionalized Silica-Coated Magnetic Nanoparticles for Extraction and
Pre-concentration of Trace Copper(II) Ions in Water Samples Prior to
Analysis Using Flame Atomic Absorption Spectrometry
Wan Aini Wan Ibrahim*1,2, Layth Imad Abd Ali1, Azli Sulaiman 1
1
Separation Science and Technology Group (SepSTec), Department of Chemistry,
Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru,
Johor, MALAYSIA.
2
Nanotechnology Research Alliance, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru,
Johor, MALAYSIA
*Corresponding author email: [email protected]
Solid phase extraction (SPE) is a widely used extraction method in sample preparation and
pre-concentration because of high concentration factor. It is normally performed using either
cartridge or disc format. However, commercially available SPE sorbent is relatively
expensive and SPE process is less environmentally friendly and rather tedious. Recently the
use of Fe3O4 magnetic nanoparticles (MNPs) as sorbents for SPE has gained big interest in
the removal of various contaminants from aqueous samples. In this work, a new
functionalized silica-coated MNPs was successfully synthesized and used as magnetic solid
phase extraction sorbent (MSPE) in batch extraction and pre-concentration of trace Cu(II)
ions in water samples. Optimized MSPE parameters (pH, volume of sample, adsorption
desorption time, sediment time, concentration and volume of elution, interference effects and
the regeneration and reusability of the adsorbent) were used for the extraction of trace Cu(II)
ions from water samples prior to analysis using flame atomic absorption spectrometry
(FAAS). The limit of detection (LOD), the limit of quantification (LOQ) and preconcentration factor of the proposed functionalized silica-coated MSPE method for Cu(II)
ions were 0.75 ng mL−1, 2.5 ng mL−1 and 33.3, respectively. The relative standard deviation
(RSD, n = 3) was 1.5%. The developed functionalized silica-coated Fe3O4 MSPE method was
successfully applied to the analysis of trace Cu(II) ions in river, lake and tap water samples
with good recoveries (92–101%). The new functionalized silica-coated MNPs offer an
interesting and promising alternative MSPE sorbent for Cu(II) ions removal from
contaminated water samples.
Keywords: Chrysin-functionalized magnetic nanoparticles; Copper(II) ions; Magnetic solid phase
extraction; Pre-concentration.