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Fontes potenciais e qualidade dos sedimentos fluviais em suspensão em ambiente urbano
| Content Provider | Semantic Scholar |
|---|---|
| Author | Poleto, Cristiano |
| Copyright Year | 2007 |
| Abstract | In the absence of sound environmental policies and adequate urban infrastructure, disordered urban growth in major metropolitan areas has caused a huge negative impact on environmental quality-especially water resources. Removal of creekside vegetation, increased paved area, and emission of untreated domestic sewage directly into waterways are the main factors that contribute to the degradation of aquatic environments. With disordered urban growth, there is an increase in sediment yield that, when combined with the pollution present in urban environments (heavy metals, insecticide, etc.), turns relatively pollution-free residential areas into important sources of non-point-source pollution. This study aims to verify the presence of some inorganic pollutants in a residential urban watershed, to identify their origin, and their potential to pollute the aquatic ecosystem. The study watershed is an area of approximately 0.83 km2, located in the metropolitan area of Porto Alegre, a major city in southern Brazil. Suspended sediment samples were collected in the watershed outlet from 2003 to 2006. Based on these samples, sediment sources were identified using trace chemical fingerprinting. It was found that sediment sources presented variability between rainfall events and within events. Total acid digestion analyses were performed to obtain the total concentrations of heavy metals and arsenic, demonstrating an enrichment process due to the presence of pollutants in the environment. Sequential extraction analyses showed different affinity characteristics for Ni and Zn in relation to the geochemical compartments of the sediment. As for the mobility of the two metals, zinc, but not nickel, appears to have a high potential to be released in the environment in case of pH and/or Eh alterations. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://lume.ufrgs.br/bitstream/handle/10183/11337/000597882.pdf;jsessionid=511BDBB30EF3776CB75815BB7BD2E783?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
