MODELLING MOLYBDATE AND TUNGSTATE ADSORPTION TO FERRIHYDRITE
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dc.contributor.author | Gustafsson J.P. | |
dc.date.accessioned | 2021-12-28T06:33:24Z | |
dc.date.available | 2021-12-28T06:33:24Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=4708284 | |
dc.identifier.citation | Chemical Geology, 2003, 200, 1-2, 105-115 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33885 | |
dc.description.abstract | The environmental geochemistry of molybdenum and tungsten is not well known. To enable predictions of Mo and W concentrations in the presence of ferrihydrite (hydrous ferric oxide), batch equilibrations were made with MoO42-, WO42-, o-phosphate (PO43-) and freshly prepared ferrihydrite suspensions in 0.01 M NaNO3 in the pH range from 3 to 10 at 25 °C. The results showed that WO42- is adsorbed more strongly than MoO42-, and that both ions are able to displace PO43- from adsorption sites at low pH. Two models, the Diffuse Layer Model (DLM) and the CD-MUSIC Model (CDM), were tested in an effort to describe the data. In both models, the adsorption of MoO42- and WO42- could be described with the use of two monodentate complexes. One of these was a fully protonated complex, equivalent to adsorbed molybdic or tungstic acid, which was required to fit the data at low pH. This was found to be the case also for a data set with goethite. In competitive systems with PO43-, the models did not always provide satisfactory predictions. It was suggested that this may be partly due to the uncertainty in the PO43- complexation constants. | |
dc.subject | MOLYBDENUM | |
dc.subject | TUNGSTEN | |
dc.subject | HYDROUS FERRIC OXIDE | |
dc.subject | SURFACE COMPLEXATION | |
dc.subject | MODELLING | |
dc.title | MODELLING MOLYBDATE AND TUNGSTATE ADSORPTION TO FERRIHYDRITE | |
dc.type | Статья |
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