Distribuição de coprostanol (5beta(H)-colestan-3beta-ol) em sedimentos superficiais da Baía de Guanabara: indicador da poluição recente por esgotos domésticos

Abstract

Recebido em 1/12/99; aceito em 11/7/00 THE IDENTIFICATION OF SEWAGE ADDITION TO GUANABARA BAY SURFICIAL SEDIMENTS AS INDICATED BY COPROSTANOL (5β(H)-CHOLESTAN-3β-OL) DISTRIBUTION. A critical evaluation is presented on the use of faecal sterols for the identification of sewage contamination in Guanabara Bay. Sediments were collected from 8 stations in the bay selected as representative of different contamination levels. GC/MS determination of faecal sterols gave: coprostanol, 335-40000 ng g-1 ; coprostanone, 112-4136 ng g-1 ; cholesterol, 1407-7800 ng g-1 ; cholestanol, 2011-10900 ng g-1 and cholestanone, 655-7954 ng g-1. The observed concentration is in accordance with the presence of known pollution sources, however, concentration ratios of different sterols species produced unclear results evidently influenced by primary production and microbial processes.

Assessment of lipid compounds and phosphorus in mangrove sediments of Santa Catarina Island, SC, Brazil

“…Coprostanol has been considered as a potential indicator of water/ sediment contamination by sewage. 19,20 Quantitative results for this compound in both mangrove environments will be discussed.…”

“…Values of this ratio higher than 0.70 are considered to be indicative of significant sewage contamination. 20,45 As cholest-5-en-3β-ol and 24-ethylcholest-5-en-3β-ol have been shown to relate to autochthonous and allochthonous material, respectively, we used the ratio cholesterol/24-ethylcholesterol to evaluate possible changes in marine-terrestrial source inputs and also to compare with data reported by other authors (Table 4). 47,48 Values of this ratio are higher at stations I1 and I2 (1.20 and 1.45 respectively) in the sediments of Itacorubi Mangrove and are less than 1.0 at other stations in both estuaries (0.22 -0.53).…”

Superficial distribution of aromatic compounds and geomicrobiology of sediments from Suruí Mangrove, Guanabara Bay, RJ, Brazil

“…As in other studies, high organic matter content was found over the entire mangrove. Organic matter content was comparable to other estuaries: Itacorubi/SC, 3.38-5.4% (Da Silva et al 2005) and 0.005-6.13%, Guanabara Bay (Vilela et al 2003, Carreira et al 2001, Baptista Neto et al 2000. The high organic matter percentages, with a patch distribution pattern and associated to particle size, are typical of mangrove environment (Wasserman et al 2001, Kehrig et al 2003.…”

Foraminíferos e atividade bacteriana aplicados no diagnóstico ambiental do estuário do rio Itacorubí, Florianópolis, SC

“…Baptista-Neto et al (2000) encontraram, no estuário da Baía de Guanabara, variações de 3 -5 %, em função da baixa circulação e entrada de esgoto doméstico. Já Carreira et al (2001), em oito estações distribuídas na mesma baía, encontraram valores entre 2,83 -5,54 %, sendo o valor mais alto encontrado na porção final a noroeste próximo aos manguezais. Vilela et al (2002) encontraram valores de carbono orgânico total na Baía de Guanabara que variaram entre 0,05 -4,14 % (canal central), 2,83 -6,13 % (porto do Rio de Janeiro), 3,23 -4,2 % (porto de Niterói), 4 % (APA de Guapimirim) e 3,09 -4,81 % (REDUC).…”