- Title
- Organophosphate flame retardant’s signatures in the Buffalo River Estuary and their removal using modified cyclodextrins
- Creator
- Bika, Sinozuko Hope
- Subject
- Water purification chemicals industry
- Subject
- Organic water pollutants
- Subject
- Rivers
- Date
- 2022-03
- Type
- Master's theses
- Type
- text
- Identifier
- http://hdl.handle.net/10353/27500
- Identifier
- vital:67363
- Description
- The increasing scarcity of fresh and clean water in many places around the world is a major concern. Water is a basic need that must be availed to humans, plants and animals at any given time. It is a requirement that each human on earth should get between 20-50 L of fresh, clean and pure water a day. It is very difficult to keep up with this need due to drastic increase in global pollution by emerging contaminants. The increase is due to human activities, modern way of life, industrialization and improper disposal of materials that contain these OPFRs. Organophosphate flame retardants OPFRs are the organic pollutants considered in this study. OPFRs are semi volatile compounds SVOCs that are used in many industries as flame retardants and additives. They were developed because of environmental and health concerns of previously used brominated and chlorinated flame retardants FRs. They show acute toxicity and exhibit adverse effects such as neurotoxicity, they are also carcinogenic to humans and animals. In recent years, some researchers have started investigating the occurrence and distribution of OPFRs in South African rivers. The aim of this study was to identify signatures of OPFRs in the aquatic environment of Buffalo River Estuary, and soil from a nearby dumpsite: and to develop a method for their removal using modified cyclodextrins. In this study, the concentration of OPFRs were investigated in sediments and soil samples collected from Buffalo River Estuary. This estuary is located close to a major port in East London city in the Eastern Cape Province, South Africa. Collection of samples was done across two seasons i.e. winter and spring. OPFRs in sediment and soil samples in this study were extracted using ultrasonic extraction method. Solid-phase extraction SPE was employed for the cleanup of the extracts, in order to reduce potential matrix interference and also for sample purification. The congeners of interest in this study were Tris 2-Choroethyl phosphate TCEP and Tris 1,3-Dicloro-2-propyl phosphate (TDCP). Samples were air dried immediately on arrival at the laboratory after being stored in an ice chest at 4 ℃ and further processed for further analysis.The concentrations of OPFRs were determined using GC-μECD (gas chromatograph coupled with micro electron capture detector) from soil and sediments in that area and they were found high in winter compared to spring owing to high level of discharge of industrial and domestic waste into the aquatic system and also the nearby dumpsite. The total concentrationof OPFRs Ʃ 2OPFRs for sediments and soil for both seasons was 39935±7619 μg/g and 10376±601 μg/g, respectively. The dominant congener in the Buffalo River Estuary was TCEP. The ecological risk assessment was estimated for the study area, and TCEP moderate risk while TDCP presented low risk. From this study, it could be inferred that the Buffalo River Estuary and the nearby dumpsite in East London are polluted by emerging pollutants i.e. OPFRs. Hence, strict control measures should be put in place to monitor all activities contributing to such magnitude of pollution in the estuary, which is of great economic value to the country. Furthermore in this study, an insoluble and hydrophilic polymer EDTA-Cysteine-β-Cyclodextrin was prepared and synthesized for the remediation of OPFRs in soil and sediments. This newly developed method was tested for the removal of TDCP an OPFR congener and it was successful with an average removal rate of 77.49 percent.
- Description
- Thesis (MSci) -- Faculty of Science and Agriculture, 2022
- Format
- computer
- Format
- online resource
- Format
- application/pdf
- Format
- 1 online resource (xxiv, 160 leaves)
- Format
- Publisher
- University of Fort Hare
- Publisher
- Faculty of Science and Agriculture
- Language
- English
- Rights
- University of Fort Hare
- Rights
- All Rights Reserved
- Rights
- Open Access
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UFH Department of Chemistry
| Thumbnail | File | Description | Size | Format | |||
|---|---|---|---|---|---|---|---|
| View Details Download | SOURCE1 | BIKA S.H MASTERS Dissertation (1).pdf | 2 MB | Adobe Acrobat PDF | View Details Download |