|
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. |
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publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
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issn |
0045-6535 |
|
isbn |
1879-1298 |
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year published |
2019 |
|
volume |
220 |
|
beginning page |
565 |
|
ending page |
573 |
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digital object identifier (doi) |
10.1016/j.chemosphere.2018.12.149 |
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web of science category |
Environmental Sciences |
|
subject category |
Environmental Sciences & Ecology |
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unique article identifier |
WOS:000458591200062
|
