NDLI: Mercury mobilization by chemical and microbial iron oxide reduction in soils of French Guyana

Content Provider	Springer Nature Link
Author	Harris Hellal, Jennifer Grimaldi, Michel Garnier Zarli, Evelyne Bousserrhine, ureddine
Copyright Year	2010
Abstract	Iron oxy(hydr)oxides (oxides) are important mercury sinks in tropical oxisols and the geochemistry of these two elements are thus closely entwined. We hypothesized that bacterial Fe-oxide reduction in anoxic conditions could be a significant mechanism for mobilizing associated Hg. Iron oxide and mercury solubilisation in presence of two chemical reducers (ascorbate and dithionite, dissolving amorphous and amorphous plus well crystallized Fe-oxides, respectively) was compared to their solubilisation in presence of autochthonous ferri-reducing bacteria. This work was carried out on two soil profiles from a small catchment basin in French Guyana, an oxisol (O) from a well drained slope and a water-saturated hydromorphic soil (H). The chemical reductions showed that in the oxisol 20 and 48% of total Hg (HgT) was associated to amorphous and well crystallized iron oxides, respectively. However, in the hydromorphic soil, no Hg seemed to be associated to amorphous iron oxides while the well crystallized fraction contained less than 9% of HgT. Chemical Fe-oxide reduction showed that Hg solubility was correlated to Fe reduction in the oxisol, demonstrating a relationship between the geochemistry of these two metals. During bacterial growth, while bacterial iron reduction solubilised up to 3.2 mg Fe g−1 soil in the oxisol sample, HgT remained unchanged. No mercury was detected in the culture medium either. However, chemical analysis showed a decrease of the amounts of Hg associated to amorphous and well crystallized Fe-oxides after 14 days of incubation, underlining the potential for iron-reducing bacteria to modify mercury distribution in soil.
Starting Page	223
Ending Page	234
Page Count	12
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	103
Issue Number	1-3
e-ISSN	1573515X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-05-19
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Mercury Iron oxides Chemical reduction Ferri-reducing bacteria French Guyana Life Sciences Environmental Chemistry Ecosystems Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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