| Autor: |
Littlejohn, Cameron |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Electronic Thesis and Dissertation Repository |
| Popis: |
Human impact on the environment can be seen in the wide variety of chemicals that are found in our water and soil. Common contaminants arise from insufficient treatment in wastewater treatment plants (WWTPs), and runoff from agriculture. Surface water samples collected in 2017-2020 at 40 different sites in six different watersheds were analyzed to determine if the commonly targeted emerging substances of concern (ESOCs) are present in Ontario and Quebec waterways. The diabetes medication metformin was analyzed more closely alongside its degradation product guanylurea as they have become targets of increasing interest due to their common occurrences and new toxicological data on organisms. Sediment samples at the same sampling sites were also collected. This work is to our knowledge the first long term analysis of metformin and guanylurea in Ontario and Quebec and offers potentially valuable insight into where metformin and guanylurea partition and accumulate in waterways. Biosolid samples from Ontario WWTPs were also analyzed for the presence of ESOCs to determine if treatment used to remove micropollutants and bacteria is also able to remove common chemical contaminants. Two extraction methods were assessed to determine their efficacy in extracting a wide variety of compounds. The concentrations of extracted compounds were also compared between the untreated biosolid cake and treated fertilizer to determine if a thermal hydrolysis process (THP) could degrade ESOCs. This work serves to validate a widespread biosolid analysis method for use in further ecotoxicological studies. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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