Environmental fluxes of perchlorate in rural catchments, Ontario, Canada
| Autor: | Dale R. Van Stempvoort, Susan J. Brown, Pamela V. Collins, D. Ross MacKay |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Drainage basin Wetland STREAMS 010501 environmental sciences 01 natural sciences Perchlorate chemistry.chemical_compound Rivers Environmental Chemistry Waste Management and Disposal Groundwater 0105 earth and related environmental sciences Hydrology Ontario geography geography.geographical_feature_category Perchlorates Pollution Deposition (aerosol physics) chemistry Environmental science Stream data Ontario canada Environmental Monitoring |
| Zdroj: | The Science of the total environment. 720 |
| ISSN: | 1879-1026 |
| Popis: | Quantitative information about fluxes of perchlorate in the environment is lacking. This study reports analyses of perchlorate in various environmental waters sampled from rural headwater catchments in the Thames River basin in southern Ontario (Canada) that provide evidence about the fluxes and fate of perchlorate in the environment. Concentrations in streams (16 to 1047 ng/L) were used to estimate exports from these rural catchments (228–1843 mg/(ha·year)), atmospheric deposition (1480 ± 230 mg/(ha·year)), as well as variable rates of microbial degradation of perchlorate, which appeared to be enhanced in catchments with higher percentages of wetlands. Groundwater data supported earlier evidence that degradation of perchlorate occurs in the subsurface under oxygen-depleted conditions. The stream data suggest that the rate of degradation varies strongly between catchments and ranges up to >1000 mg/(ha·year). |
| Databáze: | OpenAIRE |
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