sorption modelling; EXAFS; illite; sorption; montmorillonite; redox; Fe(II)
Soltermann Daniela, Marques Fernandes Maria, Baeyens Bart, Miehé-Brendlé Jocelyne, Dähn Rainer (2014), Competitive Fe(II)-Zn(II) uptake on a synthetic montmorillonite., in Environmental Science & Technology
, 48(1), 190-8.
Soltermann Daniela, Marques Fernandes Maria, Baeyens Bart, Dähn Rainer, Joshi Prachi A, Scheinost Andreas C, Gorski Christopher A (2014), Fe(II) Uptake on Natural Montmorillonites. I. Macroscopic and Spectroscopic Characterization., in Environmental Science & Technology
, 48(15), 8688-97.
Soltermann Daniela, Baeyens Bart, Bradbury Michael H, Fernandes Maria Marques (2014), Fe(II) Uptake on Natural Montmorillonites. II. Surface Complexation Modeling., in Environmental Science & Technology
, 48(15), 8698-705.
In the framework of the PhD project entitled “The influence of Fe(II) on clay properties, the sorption of Fe(II) on clays and competitive sorption investigations: a combined macroscopic and microscopic study” (SNF Grant 200021 129947) a prolongation of the SNF Grant for one year is requested. Reasons for this prolongation are given below.The experimental programme of this PhD project requires glove boxes to ensure controlled conditions (O2 < 0.1 ppm) in order to carry out sorption experiments with extremely redox sensitive elements such as Fe(II). A new redox glove box which allows to carry out experiments with radiotracers (e.g. 55Fe) was purchased by the end of 2009. Since the glove box is located in the Hot Laboratory of the Paul Scherrer Institut it has to comply with all the radioprotection safety rules imposed by the Swiss Federal Nuclear Safety Inspectorate (ENSI). Obtaining all the permissions took longer than expected and this delayed the start of the experimental part of the project by 6 months. Additionally, establishing the electrochemical set-up took longer than expected because a new adequate experimental cell ensuring a controlled redox potential (Eh) during the whole experiment inclusive sampling had to be developed.The last part of the project will focus on natural clay minerals relevant for safety analysis. In the experiments foreseen the influence of the redox state of the structural iron in natural clay minerals on the uptake of Fe(II) will be quantified and characterized. Before carrying out the sorption experiments, the structural iron of different clay minerals needs to be reduced to different degrees. The applied experimental procedure is very sensitive and time consuming and allows only small amounts of clay to be reduced.