Pedosphere 29(5): 590--597, 2019
ISSN 1002-0160/CN 32-1315/P
©2019 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Adsorption of Cadmium and Zinc onto Micaceous Minerals: Effect of Siderophore Desferrioxamine B |
Mohsen HAMIDPOUR1 , Maliheh KARAMOOZ1, Abdolreza AKHGAR1, Ahmad TAJABADIPOUR1, Gerhard FURRER2 |
1Department of Soil Science, Vali-e-Asr University of Rafsanjan, Rafsanjan 7718897111(Iran)
2Department of Environmental Systems Science, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich 8092(Switzerland) |
| Corresponding Author:Mohsen HAMIDPOUR |
| ABSTRACT |
| The mobility, bioavailability, and environmental fate of heavy metals in soil are controlled by their adsorption onto soil minerals and solid organic matter. The adsorption is strongly affected by the presence of various low-molecular-weight organic acids. In this study, effect of hydroxamate siderophore desferrioxamine B (DFOB) on cadmium (Cd) and zinc (Zn) adsorption onto two micaceous clay minerals, muscovite and phlogopite, was evaluated in batch experiments. Results showed that the presence of DFOB diminished the adsorption of Cd and Zn onto both minerals, particularly under neutral to alkaline pH conditions. For instance, at pH 8.2, the presence of DFOB caused a decrease in the adsorption of Zn onto phlogopite by nearly 50%. The equilibrium adsorption of Cd and Zn was satisfactorily described using Freundlich isotherm. The adsorption isotherms showed that the affinity of Cd and Zn onto the minerals decreased in the presence of DFOB. For example, at pH 8.0, the presence of siderophore caused a decrease in the Freundlich adsorption isotherm coefficient KF for Zn adsorption onto muscovite and phlogopite from 4.60 to 0.07 L g-1 and from 3.56 to 0.36 L g-1, respectively. These findings confirm the potential influence of siderophore on the fate of Cd and Zn in arid soils containing substantial contributions of micaceous silicate minerals. |
| Key Words: arid soil,chemical speciation,Freundlich isotherm,heavy metal,low-molecular-weight organic acid,muscovite,phlogopite,soil clay fraction |
| Citation: Hamidpour M, Karamooz M, Akhgar A, Tajabadipour A, Furrer G. 2019. Adsorption of cadmium and zinc onto micaceous minerals: Effect of siderophore desferrioxamine B. Pedosphere. 29(5): 590-597. |
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