Tracking the sources of allochthonous organic matter along a subtropical fluvial-estuarine gradient using molecular proxies in view of land uses
| Autor: | César Castro Martins, Marina Reback Domingues Garcia, Vanessa Cristina Gonçalves dos Santos, Ana Caroline Cabral, Marines Maria Wilhelm, Sérgio Antônio Netto, Ana Lúcia Lindroth Dauner, Fernanda Caroline Borato Xavier |
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| Rok vydání: | 2020 |
| Předmět: |
Geologic Sediments
Environmental Engineering Health Toxicology and Mutagenesis 0208 environmental biotechnology Fluvial Sewage 02 engineering and technology Subtropics 010501 environmental sciences 01 natural sciences Feces chemistry.chemical_compound Rivers Environmental Chemistry Organic matter 0105 earth and related environmental sciences chemistry.chemical_classification geography geography.geographical_feature_category business.industry Public Health Environmental and Occupational Health Estuary General Medicine General Chemistry Contamination Pollution 020801 environmental engineering Coprostanol Sterols chemistry Environmental chemistry Environmental science Sedimentary rock business Biomarkers Brazil Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Chemosphere. 251:126435 |
| ISSN: | 0045-6535 |
| Popis: | Sedimentary sterols and linear alkylbenzenes associated with allochthonous organic matter (AOM) inputs were studied in surface sediments along the Tubarão riverbed, South Brazil. These markers were analysed in terms of concentrations, diagnostic ratios and by using multivariate analyses to identify the main organic matter sources. It was necessary to integrate all these factors to distinguish the sources and determine sewage contamination. Phytosterols predominated over faecal sterols, but the contributions of livestock waste along the river (determined in 50% of the sites) were confirmed by the fingerprint analysis. Raw sewage contamination was verified at one site, according to the increased levels of sewage molecular markers and confirmed by the multivariate analyses and diagnostic ratios calibrated to this region. A possible synergistic effect between inorganic nanoparticles from coal mine waste and organic contaminants related to AOM input was suggested and should not be ignored since both activities severely contribute to the environmental changes in much of this fluvial-estuarine gradient from the South Atlantic. |
| Databáze: | OpenAIRE |
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