Regional assessment of sewage contamination in sediments of the Iguaçu and the Barigui Rivers (Curitiba city, Paraná, southern Brazil) using fecal steroids
| Autor: | Renato S. Carreira, Lilian Cristiane Albarello, Fabiana D.C. Gallotta, Lucas Puerari, Artur C. Bastos Neto |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
molecular marker
biology business.industry Curitiba Sewage General Chemistry Contamination biology.organism_classification River water Coprostanol chemistry.chemical_compound chemistry coprostanol Environmental chemistry Environmental science sewage contamination business Coprostanone Feces river sediments |
| Zdroj: | Journal of the Brazilian Chemical Society, Volume: 23, Issue: 11, Pages: 2027-2034, Published: 11 DEC 2012 Journal of the Brazilian Chemical Society v.23 n.11 2012 Journal of the Brazilian Chemical Society Sociedade Brasileira de Química (SBQ) instacron:SBQ |
| Popis: | Esteroides derivados de fontes fecal (coprostanol, epicoprostanol e coprostanona) e mista (colesterol, colestanol e colestanona) foram analisados em 19 amostras de sedimentos superficiais, coletados em duas amostragens, por cromatografia gasosa com detector de ionizacao de chama (GC/FID) para prover uma avaliacao regional da contaminacao por esgotos nos Rios Iguacu e Barigui, no Sul do Brasil. As concentracoes medias de coprostanol na coleta de verao (109 ± 122 µg g -1 ) e na de inverno (130 ± 116 µg g -1 ) em 2007, com maximo de ca. 330 µg g -1 , caracterizam os sedimentos como altamente contaminados por material fecal. Razoes diagnosticas usando compostos selecionados sugeriram que os efluentes domesticos sao a principal fonte de contaminacao, embora o esterco produzido em areas rurais possa ter importância localizada. Os resultados mostraram que o lancamento de esgotos nao tratados pode representar um risco para a saude ambiental do sistema fluvial quando a capacidade do sistema para dispersar e diluir efluentes e reduzida em periodos de baixo fluxo de agua. Steroids derived from fecal (coprostanol, epicoprostanol and coprostanone) and mixed (cholesterol, cholestanol and cholestanone) sources were analyzed in 19 surface sediments collected in two samplings by gas chromatography with flame ionization detection (GC/FID) in order to provide a regional assessment of the sewage contamination in the Iguacu and Barigui Rivers, Southern Brazil. The mean concentrations of coprostanol in the Summer (109 ± 122 mg g -1 ) and Winter (130 ± 116 µg g -1 ) seasons in 2007, with maximum value of approximately 330 mg g -1 , situate the studied sediments as heavily contaminated by sewage. Diagnostic ratios among selected compounds suggested that domestic effluents were the main source of contamination, although the contribution of manure from livestock might also be locally important. The results show that the release of raw sewage may pose a relevant threat to the environmental health of river systems when the capacity to disperse and dilute the effluents is reduced during periods of small river water flow. |
| Databáze: | OpenAIRE |
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