A comparison between faecal sterols and coliform counts in the investigation of sewage contamination in sediments
作者： Renata Lima da Costa , Renato S. Carreira
DOI: 10.1590/S1679-87592005000200006
关键词:
摘要: In September 2002, nine sediment samples (0-2 cm) were collected from Botafogo Cove (southwestern part of Guanabara Bay) in order to compare the use chemical (coprostanol) and biological markers (E. coli total coliforms) identifying faecal contamination. The values found (organic carbon - 6.0 64.8 mg g-1; coprostanol 1.4 105 µg E. < 30 2400 NMP/10g coliforms 40 9300 NMP/10g) similar or even higher than those observed other contaminated areas Bay. stations close shoreline, both concentration bacteria count confirmed that domestic sewage had accumulated cove. Coprostanol concentrations still relatively high furthest contamination sources, although material represented a smaller fraction organic originated by dilution waters containing algae. Reduction was proportionately virtue colimetric assessment method. This result may be associated with effect environmental variables (light, salinity, temperature) have on survival during transport deposition particles. Consequently, based these results, considered better indicator level sediments.
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