Muehe, EM; Adaktylou, IJ; Obst, M; Zeitvogel, F; Behrens, S; Planer-Friedrich, B; Kraemer, U; Kappler, A: Organic Carbon and Reducing Conditions Lead to Cadmium Immobilization by Secondary Fe Mineral Formation in a pH-Neutral Soil, Environmental Science & Technology, 47(23), 13430-13439 (2013), online: 06.11.2013, doi:10.1021/es403438n [Link]
Abstract:

Cadmium (Cd) is of environmental relevance as it enters soils via Cd-containing phosphate fertilizers and endangers human health when taken up by crops. Cd is known to associate with Fe(III) (oxyhydr)oxides in pH-neutral to slightly acidic soils, though it is not well understood how the interrelation of Fe and Cd changes under Fe(III)-reducing conditions. Therefore, we investigated how the mobility of Cd changes when a Cd-bearing soil is faced with organic carbon input and reducing conditions. Using fatty acid profiles and quantitative PCR, we found that both fermenting and Fe(III)-reducing bacteria were stimulated by organic carbon-rich conditions, leading to significant Fe(III) reduction. The reduction of Fe(III) minerals was accompanied by increasing soil pH, increasing dissolved inorganic carbon, and decreasing Cd mobility. SEM-EDX mapping of soil particles showed that a minor fraction of Cd was transferred to Ca- and S-bearing minerals, probably carbonates and sulfides. Most of the Cd, however, correlated with a secondary iron mineral phase that was formed during microbial Fe(III) mineral reduction and contained mostly Fe, suggesting an iron oxide mineral such as magnetite (Fe3O4). Our data thus provide evidence that secondary Fe(II) and Fe(II)/Fe(III) mixed minerals could be a sink for Cd in soils under reducing conditions, thus decreasing the mobility of Cd in the soil.

Aktuelle Termine

BayCEER-Kolloquium:
Do. 09.07.2020
Physical constraints and biological controls of plant-environment interactions
Do. 09.07.2020
Presentations W1/W3 Professorship Geoinformatics and Spatial Big Data
Do. 16.07.2020
Verschoben auf WS 2020/21! Investigating communal pathogen defense and its role in social evolution
Ökologisch-Botanischer Garten:
Mi. 01.07.2020 aktuell
Alle Termine im Juli 2020 entfallen!
Fr. 03.07.2020 aktuell
Gewächshäuser ab sofort wieder geöffnet!
BayCEER Blog
13.01.2020
Why Science Communication?
24.05.2019
Stoichiometric controls of C and N cycling
07.05.2019
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
07.05.2019
EGU – interesting research and free coffee
RSS Blog als RSS Feed
Wetter Versuchsflächen
Globalstrahlung: 657 W/m²
Lufttemperatur: 20.3 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 6 h/d
Wind (Höhe 32m): 13.0 km/h

...mehr
Diese Webseite verwendet Cookies. weitere Informationen