Effects of Metal-Soil Contact Time on the Extraction of Mercury from Soils

To investigate the mercury aging process in soils, soil samples were spiked with inorganic mercury (Hg(II)) or methylated mercury (MeHg) and incubated for 2, 7, 14 or 28 days in the laboratory. Potential availability of mercury, assessed by bovine serum albumin (BSA) or calcium chloride (CaCl 2 ) ex...

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Bibliographic Details
Published in:Bulletin of environmental contamination and toxicology 2015-03, Vol.94 (3), p.399-406
Main Authors: Ma, Lan, Zhong, Huan, Wu, Yong-Gui
Format: Article
Language:English
Subjects:
Aging
Aquatic Pollution
Biological Availability
Bioremediation
Calcium Chloride
Chemical Fractionation
China
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Fractionation
Mercury
Mercury - analysis
Mercury - isolation & purification
Mercury - pharmacokinetics
Organic matter
Pollution
Risk assessment
Serum Albumin, Bovine
Soil - chemistry
Soil contamination
Soil Pollutants - analysis
Soil Pollutants - isolation & purification
Soil Pollutants - pharmacokinetics
Soil Science & Conservation
Time Factors
Waste Water Technology
Water Management
Water Pollution Control
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Summary:To investigate the mercury aging process in soils, soil samples were spiked with inorganic mercury (Hg(II)) or methylated mercury (MeHg) and incubated for 2, 7, 14 or 28 days in the laboratory. Potential availability of mercury, assessed by bovine serum albumin (BSA) or calcium chloride (CaCl 2 ) extraction, decreased by 2–19 times for Hg(II) or 2–6 times for MeHg, when the contact time increased from 2 to 28 days. Decreased Hg(II) extraction could be explained by Hg(II) geochemical fractionation, i.e., Hg(II) migrated from more mobile fractions (water soluble and stomach acid soluble fractions) to refractory ones (organo-complexed, strongly complexed and residual fractions) over time, resulting in more stable association of Hg(II) with soils. In addition, decrease of mercury extraction was more evident in soils with lower organic content in most treatments, suggesting that organic matter may potentially play an important role in mercury aging process. In view of the significant decreased Hg(II) or MeHg extraction with prolonged contact time, mercury aging process should be taken into account when assessing risk of mercury in contaminated soils.
ISSN:0007-4861
1432-0800
DOI:10.1007/s00128-015-1468-x