Reliable quantification of mercury in natural waters using surface modified magnetite nanoparticles
authors Tavares, DS; Vale, C; Lopes, CB; Trindade, T; Pereira, E
nationality International
journal CHEMOSPHERE
author keywords Mercury quantification; Magnetite nanoparticles; Water analysis
keywords SOLID-PHASE EXTRACTION; ENVIRONMENTAL WATER; SILICA-GEL; CARBON NANOTUBES; AQUEOUS-SOLUTION; TRACE ANALYSIS; HG2+ IONS; MICRO; PRECONCENTRATION; REMOVAL
abstract Reliable determination of mercury (Hg) in natural waters is a major analytical challenge due to its low concentration and to the risk of Hg losses or contamination during sampling, storage and pre-treatment of samples. The present work proposes a simple, efficient, sensitive and easy-handling methodology for extraction, pre-concentration and quantification of total dissolved mercury in natural waters, using iron oxide nanoparticles (NPs) coated with silica shells functionalized with dithiocarbamate groups (Fe3O4@SiO2SiDTC). Ten mg L-1 of these NPs were sufficient to remove 83-97% of 500 to 10 ng L-1 of Hg in ultra-pure water and artificial seawater, used as model Hg solutions, within 24 h. Mercury sorbed to the NPs was then measured directly by thermal decomposition atomic absorption spectrometry with gold amalgamation. The detection limit of approximately 1.8 ng L-1 is lower than the values reported in dispersive solid phase extraction for other magnetic sorbents. As a proof-of-concept, the proposed methodology was successfully tested in real samples of fresh and saline waters and more than 91% of Hg was recovered. With this methodology the extraction and pre-concentration steps may be carried out in situ decreasing the risk of Hg losses or contamination during sampling, storage and pre-treatment of water samples. (C) 2018 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0045-6535
year published 2019
volume 220
beginning page 565
ending page 573
digital object identifier (doi) 10.1016/j.chemosphere.2018.12.149
web of science category Environmental Sciences
subject category Environmental Sciences & Ecology
unique article identifier WOS:000458591200062
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