Imperial College London
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Professor Mark Rehkämper

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Isotope Geochemistry
 
 
 
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Contact

 

markrehk Website

 
 
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Location

 

451Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Imseng:2019:10.1016/j.envpol.2018.09.149,
author = {Imseng, M and Wiggenhauser, M and Keller, A and Müller, M and Rehkamper, M and Murphy, K and Kreissig, K and Frossard, E and Wilcke, W and Bigalke, M},
doi = {10.1016/j.envpol.2018.09.149},
journal = {Environmental Pollution},
pages = {834--844},
title = {Towards an understanding of the Cd isotope fractionation during transfer from the soil to the cereal grain},
url = {http://dx.doi.org/10.1016/j.envpol.2018.09.149},
volume = {244},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Cd in soils might be taken up by plants, enter the food chain and endanger human health. This study investigates the isotopic fractionation of major processes during the Cd transfer from soils to cereal grains. Thereto, soil, soil solution, wheat and barley plants (roots, straw and grains) were sampled in the field at three study sites during two vegetation periods. Cd concentrations and δ114/110Cd values were determined in all samples. The composition of the soil solution was analyzed and the speciation of the dissolved Cd was modelled. Isotopic fractionation between soils and soil solutions (Δ114/110Cd20-50cm-soil solution=−0.61 to −0.68‰) was nearly constant among the three soils. Cd isotope compositions in plants were heavier than in soils (Δ114/110Cd0-20cm-plants=−0.55 to −0.31‰) but lighter than in soil solutions (Δ114/110Cdsoil solution-plants=0.06–0.36‰) and these differences correlated with Cd plant-uptake rates. In a conceptual model, desorption from soil, soil solution speciation, adsorption on root surfaces, diffusion, and plant uptake were identified as the responsible processes for the Cd isotope fractionation between soil, soil solution and plants whereas the first two processes dominated over the last three processes. Within plants, compartments with lower Cd concentrations were enriched in light isotopes which might be a consequence of Cd retention mechanisms, following a Rayleigh fractionation, in which barley cultivars were more efficient than wheat cultivars.
AU  - Imseng,M
AU  - Wiggenhauser,M
AU  - Keller,A
AU  - Müller,M
AU  - Rehkamper,M
AU  - Murphy,K
AU  - Kreissig,K
AU  - Frossard,E
AU  - Wilcke,W
AU  - Bigalke,M
DO  - 10.1016/j.envpol.2018.09.149
EP  - 844
PY  - 2019///
SN  - 0269-7491
SP  - 834
TI  - Towards an understanding of the Cd isotope fractionation during transfer from the soil to the cereal grain
T2  - Environmental Pollution
UR  - http://dx.doi.org/10.1016/j.envpol.2018.09.149
UR  - http://hdl.handle.net/10044/1/65168
VL  - 244
ER  -
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