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Sorption kinetics of isotopically labelled divalent mercury (196Hg2+) in soil
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4522478
Author(s) Shetaya, Waleed H.; Huang, Jen-How; Osterwalder, Stefan; Mestrot, Adrien; Bigalke, Moritz; Alewell, Christine
Author(s) at UniBasel Alewell, Christine
Huang, Jen-How
Shetaya, Waleed Hares
Osterwalder, Stefan
Year 2019
Title Sorption kinetics of isotopically labelled divalent mercury (196Hg2+) in soil
Journal Chemosphere
Volume 221
Number 19
Pages / Article-Number 193-202
Keywords Environmental pollution, Heavy metals, Stable isotopes, Kinetic modelling
Mesh terms Adsorption; Carbon; Diffusion; Hydrogen-Ion Concentration; Isotopes; Kinetics; Mercury, analysis; Soil, chemistry; Soil Pollutants, analysis; Solubility
Abstract Understanding the  sorption kinetics of Hg 2+ is the key to predicting its reactivity in soils which is indispensable for  environmental risk assessment . The temporal change in the  solubility of  196 Hg 2+ spikes (6 mg kg −1 ) added to a range of soils with different properties was investigated and modelled. The sorption of  196 Hg 2+ displayed a biphasic pattern with a rapid initial (short-term) phase followed by a slower (time-dependent) one. The overall  reaction rate constants ranged from 0.003 to 4.9 h −1 and were significantly correlated (r = 0.94) to soil  organic carbon (SOC). Elovich and Spherical Diffusion expressions compellingly fitted the observed  196 Hg 2+ sorption kinetics highlighting their flexibility to describe reactions occurring over multiple phases and wide timeframes. A parameterized Elovich model from soil variables indicated that the short-term sorption is solely controlled by SOC while the time-dependent sorption appeared independent of SOC and decreased at higher pH values and Al(OH) 3 and MnO 2 concentrations. This is consistent with a rapid chemical reaction of Hg 2+ with  soil organic matter (SOM) which is followed by a noticeably slower phase likely occurring through physical pathways e.g. pore diffusion of Hg 2+ into spherical soil aggregates and progressive incorporation of soluble organic-Hg into solid phase. The model lines predicted that in soils with >4% SOC, Hg 2+ is removed from soil solution over seconds to minutes; however, in soils with <2% SOC and higher pH values, Hg 2+ may remain soluble for months and beyond with a considerable associated risk of re-emission or migration to the surrounding environments.
Publisher Elsevier
ISSN/ISBN 0045-6535 ; 1879-1298
URL https://boris.unibe.ch/125091/
edoc-URL https://edoc.unibas.ch/73521/
Full Text on edoc No
Digital Object Identifier DOI 10.1016/j.chemosphere.2019.01.034
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/30639815
ISI-Number WOS:000460710700022
Document type (ISI) Journal Article
 
   

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