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The amendment of acid soil with an ettringitic waste and its effects on plant growth
Bibliography: pages 63-68.
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| Format: | Thesis |
| Language: | English |
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Department of Geological Sciences
2016
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| _version_ | 1867613159377862656 |
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| access_status_str | Open Access |
| author | Tomlinson, Ian Rory |
| author2 | Fey, Martin V |
| author_browse | Fey, Martin V Tomlinson, Ian Rory |
| author_facet | Fey, Martin V Tomlinson, Ian Rory |
| author_sort | Tomlinson, Ian Rory |
| collection | Thesis |
| description | Bibliography: pages 63-68. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21334 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:43.046Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Geological Sciences |
| publisherStr | Department of Geological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/21334 The amendment of acid soil with an ettringitic waste and its effects on plant growth Tomlinson, Ian Rory Fey, Martin V Willis, James Geological Sciences Bibliography: pages 63-68. Associated with ESKOM's ash water beneficiation programme is the precipitation of an ettringitic waste from highly alkaline, saline water. The waste is dominated by ettringite (CauAJ4(OH)24(S04) 6.52H20) with calcite (CaC03) as a minor phase (17.7% for the sample used in this study). Apart from the presence of calcite, the ettringite itself is alkaline due to the presence of OH ions. Following a submission that the waste had potential as an ameliorant of acid soil, research into this possibility was initiated. Following the determination of a calcium carbonate equivalent (HCl-CCE) value of 78% using the HCl back titration method of Horwitz (1980), an incubation experiment was initiated using three acid soils of contrasting characteristics: a so-called Silvermine sand, Kranskop A and Kranskop B soils. The effects on soil acidity of ettringitic waste were compared with analytical grade calcite. Soils (50g samples) were incubated with the two alkaline amendments for two weeks, following which pH(KCl), pH(H20) and KCl-extractable acidity were determined. Ettringitic waste led to apparently lower levels of acidity neutralization for corresponding treatments set on an HCl-CCE basis. This difference was minimized with the highly buffered, sesquioxide and organic-rich Kranskop A soil which could be attributed to the greater reactivity of the ettringitic waste with organically-complexed acidity together with the "self-liming" effect of so4 in sesquioxide-rich soils (sensu Reeve & Sumner, 1972). The waste showed progressively less neutralization with Kranskop B and Silvermine soils apparently in response to a decline in buffering capacity of these soils. 2016-08-18T13:52:58Z 2016-08-18T13:52:58Z 1995 Master Thesis Masters MSc http://hdl.handle.net/11427/21334 eng application/pdf Department of Geological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Geological Sciences Tomlinson, Ian Rory The amendment of acid soil with an ettringitic waste and its effects on plant growth |
| thesis_degree_str | Master's |
| title | The amendment of acid soil with an ettringitic waste and its effects on plant growth |
| title_full | The amendment of acid soil with an ettringitic waste and its effects on plant growth |
| title_fullStr | The amendment of acid soil with an ettringitic waste and its effects on plant growth |
| title_full_unstemmed | The amendment of acid soil with an ettringitic waste and its effects on plant growth |
| title_short | The amendment of acid soil with an ettringitic waste and its effects on plant growth |
| title_sort | amendment of acid soil with an ettringitic waste and its effects on plant growth |
| topic | Geological Sciences |
| url | http://hdl.handle.net/11427/21334 |
| work_keys_str_mv | AT tomlinsonianrory theamendmentofacidsoilwithanettringiticwasteanditseffectsonplantgrowth AT tomlinsonianrory amendmentofacidsoilwithanettringiticwasteanditseffectsonplantgrowth |