Hidrocarbonetos e esterois como indicadores de fontes e destino de matéria orgânica em sedimentos da Baía de Sepetiba, Rio de Janeiro

Carreira, Renato S.; Ribeiro, Patrícia V.; Silva, Carlos E. M.; Farias, Cassia O.

doi:10.1590/s0100-40422009000700023

Cited by 41 publications

(20 citation statements)

References 26 publications

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“…Total ion current chromatogram (TIC) extracted at mass 57 support the presence of TPH (see Fig 4). The highest levels of TPH in mussels were found during 2004 (61-287 µg g -1 d.w.) which is coincident with the highest levels found in sediments, and they are higher than chronically mildly polluted areas such as Todos os Santos Bay (42 µg g -1 ) 45 and Sepetiba Bay, Brasil (0.26-2.65 µg g -1 ) 46 , Westernport, Australia (126 µgg 1 ) 47 , Narragansett Bay, Rhode Island (42 µg g -1 ) 48 , the Amposta Offshore Oil Production Plataform, Western Mediterranean (40 µg g -1 ) 49 and Gulf of Naples (48 µgg -1 wet weight)…”

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confidence: 57%

Temporal and Spatial Trends of Total Aliphatic Hydrocarbons of Diesel Range and Trace Elements in Sediments and Mussels of the Corral Bay Area, Valdivia, South Central Chile

Palma-Fleming¹,

R²,

Campillay³

et al. 2012

J. Chil. Chem. Soc.

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Sediments and mussel specimens of Mytilus chilensis were analyzed for organic pollutant fingerprints and heavy metals in the Corral Bay area of Valdivia, South Central Chile during the period [2003][2004]. GC-MS analysis show hydrocarbon fingerprints corresponding mainly to mixed inputs of aliphatic hydrocarbons of the TPH-diesel fraction and biogenic hydrocarbons, indicating low to medium contamination by petroleum hydrocarbons with high biodegradation of petroleum in sediments at Las Coloradas, La Escuela and Corral Bay (C 17 /Pri < 1 and C 18 /Phy < 1). Mussel TPH fingerprints show weathered hydrocarbons resulting in a zone of increased concentration of cyclic respect to acyclic aliphatic components (UCM), indicating the presence of petroleum hydrocarbons. No temporal variation the in concentration of TPH-diesel found in sediments as well as mussels were observed except for samples collected during January 2004. TPH concentration levels in the sediments varied from 0.4 µgg -1 to 33.8 µgg -1 d.w. whereas in mussels varied between 61 µg g -1 and 287 µgg -1 d.w. Heavy metals were also analyzed by atomic absorption spectrometry and low concentration as well as no seasonal variations of concentration were found in mussels at each sampling point and a relatively even distribution of metals among stations was observed. Maximum concentrations in all sampling points of sediments were found for Fe (24128-43791 µgg -1 ) and Mn (181-388 µgg -1 ) while the minimum concentration was found for Pb (nd-12 µgg). According to the Sediment Quality Guidelines (SQGs-NOAA), the concentration levels of Cu and As in all sediment sampling points are above the "Effects Range-Low" (ERL), indicating that there may be a probable toxicity effect over the biota and attention must be paid on a moderate range of priority.

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confidence: 57%

Temporal and Spatial Trends of Total Aliphatic Hydrocarbons of Diesel Range and Trace Elements in Sediments and Mussels of the Corral Bay Area, Valdivia, South Central Chile

Palma-Fleming¹,

R²,

Campillay³

et al. 2012

J. Chil. Chem. Soc.

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“…6 No Brasil, os estudos que usam coprostanol e outros esterois fecais na avaliação da contaminação fecal em áreas costeiras são ainda relativamente recentes, sendo a grande maioria deles relativos às regiões sul-sudeste do país. [8][9][10][11][12][13][14][15] No geral, esses trabalhos confirmam a aplicabilidade do coprostanol como indicador fecal em regiões tropicais. Por outro lado, sugerem que a geoquímica dos esterois fecais pode ser afetada pela elevada atividade microbiana em altas temperaturas e, desta forma, os índices de contaminação fecal definidos para regiões temperadas 6,16 devem ser aplicados com cautela em regiões tropicais.…”

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Esterois como indicadores do acúmulo de esgotos domésticos em sedimentos de um sistema estuarino-lagunar tropical (Mundaú-Manguaba, AL)

2011

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, AL). The history of sewage contamination in the Mundaú-Manguaba estuarine lagoon system (NE Brazilian coastal zone) was evaluated through the concentration of sterols in sediment cores. The concentration of coprostanol increased towards the surface sediments, with the maximum of 5.65 µg g -1 at 0-2 cm sediment layer in Mundaú. Manguaba exhibited a lower level of contamination. The ratio cholestanol/cholesterol suggested degradation of coprostanol only before the burial of organic matter in the sediment. This feature, together with information of population growth in the watershed, allowed the estimation of a sedimentation rate of 0.90 cm year -1 to the Mundaú lagoon.Keywords: fecal contamination; sediment core; coprostanol. INTRODUÇÃOOs esgotos domésticos são um dos principais vetores de contaminação para ambientes aquáticos, devido ao grande volume produzido diariamente e por conter, além de matéria orgânica, diversas outras classes de contaminantes presentes em produtos de uso residencial, tais como metais, hidrocarbonetos e compostos orgânicos persistentes.1 A grande concentração populacional na zona costeira, aliada à falta de infraestrutura para coleta, tratamento e disposição final de esgotos domésticos resulta no lançamento desses efluentes diretamente nos corpos d'água localizados na zona de transição continente-oceano, trazendo prejuízos para a qualidade da água e dos sedimentos, com reflexos sobre a saúde humana. 2As bactérias do grupo dos coliformes são indicadores tradicionais da contaminação fecal, sendo largamente utilizadas para atestar condições de balneabilidade dos corpos d'água. 3,4 No entanto, para acompanhar a dispersão espacial e o acúmulo de esgotos domésticos na zona costeira, é necessário considerar um indicador que tenha maior persistência no meio do que a apresentada pelos indicadores biológicos. Uma das melhores alternativas para contornar esse problema é o uso de moléculas específicas, conhecidas genericamente como marcadores moleculares antropogênicos. 5,6 Neste sentido, o coprostanol (5β-colestan-3β-ol), um esterol de origem fecal produzido no intestino de animais de sangue quente e que representa até 60% dos esterois fecais em humanos, 7 tem sido largamente utilizado como indicador da contaminação fecal já desde a década de 1960. 6 No Brasil, os estudos que usam coprostanol e outros esterois fecais na avaliação da contaminação fecal em áreas costeiras são ainda relativamente recentes, sendo a grande maioria deles relativos às regiões sul-sudeste do país. [8][9][10][11][12][13][14][15] No geral, esses trabalhos confirmam a aplicabilidade do coprostanol como indicador fecal em regiões tropicais. Por outro lado, sugerem que a geoquímica dos esterois fecais pode ser afetada pela elevada atividade microbiana em altas temperaturas e, desta forma, os índices de contaminação fecal definidos para regiões temperadas 6,16 devem ser aplicados com cautela em regiões tropicais.No presente trabalho, os esterois coprostanol, colesterol, colestanol e dinosterol foram considerados em testemu...

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“…Alternatively, the low C 17 /Pr and C 18 /Ph can be result of a higher input of pristane and phytane. According to Ten Haven et al, 65 the interpretation of these ratios sometimes may not be reliable due to the wide variety of sources for these isoprenoid compounds.Comparing these results with other degraded environments, 7,[66][67][68][69] it is observed that, although these samples exhibit intermediate values for the total n-alkanes, UCM concentrations are higher than in most other regions. Significantly higher concentrations of UCM were found by Wagener et al 30 near the station P2, which may indicate heterogeneity of the bay sediments that can be explained by the action of the tides in the remobilization and transport or even by dredging activities and sediment transport to outside the bay.…”

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confidence: 76%

Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

Ceccopieri

Scofield

Almeida

et al. 2018

J. Braz. Chem. Soc.

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Different clean-up methods to determine isotopic composition of n-alkanes were tested. Sources of organic matter in Guanabara Bay were re-examined through the δ 13 C of individual n-alkanes in surface sediment samples. The n-alkanes were efficiently isolated without significant losses of the compounds of interest. The δ 13 C of n-alkanes (n-C 17 to n-C 35 ) ranged between -34.0 and -26.4‰. More depleted δ 13 C values associated to higher carbon preference index (CPI > 4) suggest prevalence of biogenic n-alkanes from terrestrial origin in the inner stations influenced by inputs from mangrove areas. Small isotopic differences between odd and even-numbered chains and 13 C-enrichment in long-chain homologues indicate a petrogenic hydrocarbons contribution. Higher concentrations of short-chain compounds associated to a more 13 C-enriched total organic carbon (TOC) were found near the most intense sewage discharges. Results show that δ 13 C of n-alkanes can be applied to a highly degraded system as the Guanabara Bay and help improve the characterization of the organic matter. Keywords: GC-C-IRMS, UCM, urea adduction, organic matter, Guanabara Bay IntroductionThe composition and distribution of hydrocarbons in sediment samples provide information about the organic matter sources and transformation processes occurring in the environment. 1 Studies on n-alkanes have often been conducted to assess the origin of hydrocarbons, such as biogenic (marine or terrestrial) or petrogenic, found in the marine environment. The assessment makes use of the difference in the n-alkane chain length to draw conclusions on the sources of organic matter. In higher plants, for example, n-alkanes from epicuticular waxes show long chains and an odd over even-numbered carbon chain predominance. 2 Algae are characterized by shorter chain lengths with no expressive odd-over-even preference. 3 In contrast, n-alkanes in fossil fuels have a wide composition range, without predominance of odd or even-numbered chains. 4 However, despite these typical fingerprints, there are cases in which n-alkane profile of different classes of organisms overlap, resulting in ambiguous interpretations of the organic material sources. 5 Given this multiplicity of origins, an interpretation of the different sources exclusively by the concentrations of n-alkanes is very limited in more complex environments. 6 During the last decades, the carbon isotopic analysis of some biomarkers have been widely used as a valuable tool to better distinguish the sources of organic matter in marine environments. 5,[7][8][9][10][11][12][13][14] The carbon isotope composition in the biosynthesized organic material depends on both the isotopic composition of the carbon source used by organisms and the isotope discrimination that occurs during carbon fixation, which includes the steps of absorption and intracellular diffusion, and also the biosynthesis of the cell components. 15 Thus, when two classes of organisms present an overlap in the n-alkane distribution, additional information can b...

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Hidrocarbonetos e esterois como indicadores de fontes e destino de matéria orgânica em sedimentos da Baía de Sepetiba, Rio de Janeiro

Cited by 41 publications

References 26 publications

Temporal and Spatial Trends of Total Aliphatic Hydrocarbons of Diesel Range and Trace Elements in Sediments and Mussels of the Corral Bay Area, Valdivia, South Central Chile

Temporal and Spatial Trends of Total Aliphatic Hydrocarbons of Diesel Range and Trace Elements in Sediments and Mussels of the Corral Bay Area, Valdivia, South Central Chile

Esterois como indicadores do acúmulo de esgotos domésticos em sedimentos de um sistema estuarino-lagunar tropical (Mundaú-Manguaba, AL)

Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

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