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Determination of trace labile copper in environmental waters by magnetic nanoparticle solid phase extraction and high-performance chelation ion chromatography

journal contribution
posted on 2023-05-18, 09:40 authored by Wei, Z, Sandron, S, Ashley TownsendAshley Townsend, Nesterenko, PN, Brett PaullBrett Paull
Cobalt magnetic nanoparticles surface functionalised with iminodiacetic acid were evaluated as a nano-particulate solid phase extraction absorbent for copper ions (Cu2+) from environmental water samples. Using an external magnetic field, the collector nanoparticles could be separated from the aqueous phase, and adsorbed ions simply decomplexed using dilute HNO3. Effects of pH, buffer concentration, sample and sorbent volume, extraction equilibrium time, and interfering ion concentration on extraction efficiency were investigated. Optimal conditions were then applied to the extraction of Cu2+ ions from natural water samples, prior to their quantitation using high-performance chelation ion chromatography. The limits of detection (LOD) of the combined extraction and chromatographic method were ~0.1 ng ml−1, based upon a 100-fold preconcentration factor (chromatographic performance; LOD=9.2 ng ml−1 Cu2+), analytical linear range from 20 to 5000 ng mL−1, and relative standard deviations=4.9% (c=1000 ng ml−1, n=7). Accuracy and precision of the combined approach was verified using a certified reference standard estuarine water sample (SLEW-2) and comparison of sample determinations with sector field inductively coupled plasma mass spectrometry. Recoveries from the addition of Cu2+ to impacted estuarine and rain water samples were 103.5% and 108.5%, respectively. Coastal seawater samples, both with and without prior UV irradiation and dissolved organic matter removal were also investigated using the new methodology. The effect of DOM concentration on copper availability was demonstrated.

Funding

Australian Research Council

History

Publication title

Talanta

Volume

135

Pagination

155-162

ISSN

0039-9140

Department/School

School of Natural Sciences

Publisher

Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

Rights statement

Copyright 2015 Elsevier B.V.

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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