Non-aromatic hydrocarbons in recent sediments of Sepetiba and Ilha Grande Bays, Brazil

Figueiredo, Luis Henrique Melges; Wagener, Ângela de Luca Rebello; Dagaut, J.; Saliot, A.

doi:10.1590/s0103-50532008000300020

Cited by 14 publications

(11 citation statements)

References 26 publications

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“…This high average could be attributed to the nature of the sampling locations since Imb2 station is located beside the wharf of the port with lower hydrocarbon inputs from higher plants, however, station Ita1, which is located next to the Itajaí-Açu River mouth and thus receives higher hydrocarbon inputs to the sediment from the water column. In general, the concentrations calculated in our study were higher than those observed for sediment samples collected from other marine areas, such as the southern Okinawa Trough (3.0-9.4 μg g −1 of TOC; Jeng 2007), the Yellow River mouth (920-2,740 μg g −1 of TOC; Zhang et al 2008), northeastern Taiwan (96.4-445.0 μg g −1 of TOC; Jeng et al 2003), and the Ilha Grande and Sepetiba Bays (0.07-0.60 μg g −1 of TOC; Figueiredo et al 2008).…”

Section: N-alkanes and Isoprenoid Hydrocarbonsmentioning

confidence: 99%

Assessment and sources of nonaromatic hydrocarbons in surface sediments of three harbors in Santa Catarina State, Brazil

Oliveira

Madureira

2010

Environ Monit Assess

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Nonaromatic hydrocarbons and geochemical parameters from 17 sediment-water interface samples were used to assess sources of organic matter in three harbors, located in Santa Catarina State, southern Brazil. The evaluation was based on the molar C/N/P ratios, abundance of resolved nonaromatic hydrocarbons (3.0-25.9 μg g(-1)), unresolved complex mixture, and two indexes: the carbon preference index (CPI) and the low molecular weight to high molecular weight ratio. The results indicate that the organic matter is predominantly of terrestrial origin (C/N>10 and CPI>2). Variations in the total organic carbon from 0.43 to 2.98 mmol g(-1) and total phosphorus from 82.4 to 464.3 μg g(-1) showed no clear correlation with the silt and clay fractions of the sediments possibly due to anthropogenic input. In contrast to the low level of contamination based on the acyclic hydrocarbon distribution, the results obtained from a series of geologically stable hopanes and steranes reveal the presence of less degradable petroleum derivatives.

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Section: N-alkanes and Isoprenoid Hydrocarbonsmentioning

confidence: 99%

Assessment and sources of nonaromatic hydrocarbons in surface sediments of three harbors in Santa Catarina State, Brazil

Oliveira

Madureira

2010

Environ Monit Assess

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“…These values are comparable to unpolluted (< 100 µg g -1 dw) 4 and polluted coastal environments around the world. [30][31][32] Organic carbon normalization revealed that hydrocarbon concentrations in these samples may be underestimated when expressed as dry weight, notably in SM1A (NA concentration of 4.8 µg g -1 dw and 1,034.3 µg g -1 OC). The Santo Antônio Lagoon samples (SA1-4) showed the highest values for both AH and NA.…”

Section: Aliphatic Hydrocarbons and N-alkanesmentioning

confidence: 99%

Geochemical markers as a tool to assess sedimentary organic matter sources of the Laguna Estuarine System, south Brazil: aliphatic and polycyclic aromatic hydrocarbons

Tarozo

Frena

Augusto

et al. 2010

J. Braz. Chem. Soc.

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Amostras de sedimentos superficiais do Sistema Estuarino de Laguna foram analisadas objetivando a identificação das fontes de matéria orgânica. Razões entre n-alcanos selecionados, elevados teores de hidrocarbonetos alifáticos (HA) (média de 9.168 µg g -1 de carbono orgânico, CO) e policíclicos aromáticos (HPA) (média total de 426.593 ng g -1 CO), e a distribuição de hopanos com estereoquímica αβ detectados nas amostras da Lagoa de Santo Antônio foram evidências de que o aporte de hidrocarbonetos petrogênicos prevalece sobre os de fontes naturais. Nas demais amostras estudadas, a distribuição de HA (de 38 até 2.749 µg g -1 CO), a detecção de hopenos e hopanos-ββ sugerem hidrocarbonetos de fontes mistas. Todavia, o teor de HPA em todas as amostras (de 7.731 até 786.469 ng g -1 CO, sendo que os aromáticos alquilados representaram > 92% do total) revelou contaminação petrogênica crítica. As atividades pesqueira e urbana são fontes potenciais dos hidrocarbonetos petrogênicos detectados nas amostras sedimentares.Surface sediment samples from the Laguna Estuarine System were analyzed to identify organic matter sources. The ratios between selected n-alkanes, high concentrations of aliphatic hydrocarbons (AH) (average of 9,168 µg g -1 of organic carbon, OC) and polycyclic aromatic hydrocarbons (PAH) (total average of 426,593 ng g -1 OC), and the hopanes distribution with αβ stereochemistry found in the Santo Antônio Lagoon samples were evidence that hydrocarbon inputs from petrogenic sources predominate over natural sources. In the other samples studied, the AH distribution (from 38 to 2,749 µg g -1 OC), and detection of hopenes and hopanes-ββ suggest mixed sources of hydrocarbons. Nevertheless, PAH concentrations in all samples (from 7,731 to 786,469 ng g -1 OC, whereof alkyl naphthalenes accounted for > 92% of the total) indicated critical petrogenic contamination. Fishing and urban activities are potential sources to the petrogenic hydrocarbons detected in these sediment samples. Keywords: hydrocarbons, hopanes, PAH, sediment, chromatography IntroductionEstuaries are important areas of world's coastal zones. In general, they are highly productive and provide spawning and nursery grounds for migratory species, besides playing a significant role in the global carbon cycle.1,2 Furthermore, an overwhelming majority of the human populations is concentrated along or near coasts, which inevitably leads to complex problems concerning environmental quality due to the residues generated by miscellaneous human activities.Along with various other organic and inorganic contaminants, the study of sedimentary aliphatic hydrocarbons (AH) (e.g., n-alkanes and hopanes) provides an important tool to assess organic matter sources and pollution levels in aquatic ecosystems. [3][4][5] This class of organic compounds has biogenic and anthropogenic sources. Natural inputs are comprised mostly of vascular plants, algae, microorganisms and early diagenesis of natural products, whereas petroleum and its derivatives are generally examples of hu...

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“…1,40 O índi-ce TAR (terrestrial aquatic ratio) foi proposto originalmente por Bourboniere e Meyers 41 para relacionar a proporção dos n-alcanos de origem terrestre (n-C 29 , n-C 29 e n-C 31 ) e marinha (n-C 15 , n-C 17 e n-C 19 ). Na Baía de Sepetiba, os valores de TAR mais elevados, entre 4 e 9 (Tabela 2), foram encontrados nas mesmas estações nas quais os outros índices de n-alcanos já discutidos (IPC e ACL) também indicam presença de matéria orgânica terrestre.…”

Section: Figura 4 Percentual De 24-etilcolest-5-en-3β-ol (Sitosterolunclassified

“…18,19 Da mesma forma, as informações sobre as fontes de matéria orgânica de origem natural são relativamente restritas. 20 No presente trabalho foi feita a determinação de hidrocarbonetos alifáticos e esterois em sedimentos superficiais com o objetivo de identificar as fontes naturais (autóctonas e alóctonas) e antropogê-nicas (hidrocarbonetos e esgotos domésticos) de matéria orgânica para a Baía de Sepetiba.…”

Section: Introductionunclassified

“…19 Este gradiente significativo de concentração possivelmente é decorrente da rápida remoção dos n-alcanos para os sedimentos durante o processo de mistura estuarina ou reflete a dispersão eficiente dos materiais lançados pelos rios da porção central da baía. 18 As maiores concentrações de n-alcanos de cadeia ímpar de carbono na faixa n-C 25 e n-C 33 (Figura 3) e os valores do índice preferencial de carbono 36 entre 3,0 e 4,5 (Tabela 2) indicam que o aporte de matéria orgânica de origem continental é mais significativo que o aporte autóctono.…”

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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

Carreira¹,

Ribeiro²,

Silva³

et al. 2009

Quím. Nova

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Recebido em 15/9/08; aceito em 11/3/09; publicado na web em 4/8/09 HYDROCARBONS AND STEROLS AS INDICATORS OF SOURCE AND FATE OF ORGANIC MATTER IN SEDIMENTSFROM SEPETIBA BAY, RIO DE JANEIRO. The inputs of organic matter derived from natural and anthropogenic sources to Sepetiba Bay were investigated by using aliphatic hydrocarbons and sterols in superficial sediments. Concentrations ranged from 0.26 to 2.65 μg g -1 , <0.01 to 17.41 μg g -1 and 0.77 and 9.24 μg g -1 for n-alkanes, UCM (unresolved complex mixture) and total sterols, respectively. The selected markers and ratios among individual compounds showed the major contribution of terrestrial sources to the total pool of sedimentary organic matter in the bay, but the accumulation of autochthonous organic matter increased with distance from the shoreline. The input of petroleum hydrocarbons and sewage (coprostanol in the range 0.01 to 0.43 μg g -1 ) were also detected, especially in the more urbanized regions of the bay, but at lower levels of contamination when compared to estuaries in other Brazilian coastal regions.Keywords: Sepetiba Bay; sediments; organic matter. INTRODUÇÃOA matéria orgânica em sedimentos costeiros tem origem em diversas fontes -terrestres, aquáticas, atmosféricas e antropogênicas, no caso de áreas urbanizadas -que apresentam grande variabilidade espacial e temporal nas suas contribuições relativas.1-3 De acordo com sua origem, a matéria orgânica apresenta reatividades bastante distintas frente aos gradientes significativos nas propriedades físico-químicas, químicas e bióticas dos sistemas aquáticos, particularmente em regiões estuarinas.4,5 A elucidação dos processos que determinam a produção, transporte e acúmulo de matéria orgânica em sistemas aquáticos é fundamental para a compreensão dos ciclos biogeoquí-micos globais, mas ao mesmo tempo representa um dos grandes desafios da geoquímica orgânica em decorrência da multiplicidade dos fatores envolvidos. 4,6 Diversas classes de compostos na fração de lipídios (n-alcanos, ácidos graxos, alcoóis lineares e esteróis, entre outras) são utilizadas na caracterização da matéria orgânica sedimentar devido à boa especificidade em relação à fonte e à maior resistência aos processos de degradação bacteriana, quando comparados com outros grupos de compostos orgânicos, como carboidratos e proteínas. 3,7,8 Os n-alcanos, por exemplo, apresentam diferenças em relação ao tamanho da cadeia de carbono que permitem a identificação de fontes autóctonas e alóc-tonas de matéria orgânica, incluindo a contaminação petrogênica. [9][10][11]

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Non-aromatic hydrocarbons in recent sediments of Sepetiba and Ilha Grande Bays, Brazil

Cited by 14 publications

References 26 publications

Assessment and sources of nonaromatic hydrocarbons in surface sediments of three harbors in Santa Catarina State, Brazil

Assessment and sources of nonaromatic hydrocarbons in surface sediments of three harbors in Santa Catarina State, Brazil

Geochemical markers as a tool to assess sedimentary organic matter sources of the Laguna Estuarine System, south Brazil: aliphatic and polycyclic aromatic hydrocarbons

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

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