Format:
Online-Ressource
ISSN:
2199-398X
Content:
Abstract Fe/Mn oxides are also important solid phases for the sorption of soluble Hg in soil–groundwater systems. We use a series of (60 mL syringe based) column experiments to examine sorption and subsequent desorption of HgCl2 solutions (experiment 1 (EXP1): 46.1 ± - 1 ± - 1) in low-OM (0.16 ± ± ± - 1 δ 202 ± ± δ 202 Fe/Mn oxides and clay mineral surfaces (liquid phase enriched in heavy isotopes) and then slower release of Hg (II) species that have undergone secondary reaction to more stable/less-soluble Hg (II) species and/or diffusion/transport into the mineral matrices (processes favouring lighter isotopes; solid phase enriched in lighter isotopes). The secondary production of Hg (0) within the columns is confirmed by PTD analyses that indicate distinct Hg (0) release peaks in solid-phase samples at 〈 175 ∘ C, which again agrees with field observations. Retardation (R D) and distribution (K D) coefficients are 77.9 ± ± - 1 ± ± - 1 in EXP2, respectively. These values are similar to values derived from column experiments on high-OM soil and provide the basis for future Hg fate and transport modelling in soil–groundwater systems.
In:
volume:10
In:
number:1
In:
year:2024
In:
pages:77-92
In:
extent:16
In:
Soil, Göttingen : Copernicus Publ., 2015-, 10, Heft 1 (2024), 77-92 (gesamt 16), 2199-398X
Language:
English
DOI:
10.5194/soil-10-77-2024
URN:
urn:nbn:de:101:1-2024020803284026262860
URL:
https://doi.org/10.5194/soil-10-77-2024
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2024020803284026262860
URL:
https://d-nb.info/1318630584/34
URL:
https://soil.copernicus.org/articles/10/77/2024/soil-10-77-2024.pdf
URL:
https://soil.copernicus.org/articles/10/77/2024/
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