Hydrocarbons in 60 northeast Gulf of Mexico shelf sediments: a preliminary survey

Gearing, Patrick J.; Gearing, J. N.; Lytle, Thomas F.; Lytle, Julia S.

doi:10.1016/0016-7037(76)90043-0

Cited by 179 publications

(61 citation statements)

References 32 publications

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“…The CPI [24][25][26][27][28][29][30][31][32][33][34] values (1.7-4.3; Supplemental Data, Table S2) in the present study were greater than 1 but lower than those of typical terrestrial higher plants (5-10) [31], suggesting additional contributions from other sources. In the present study, the addition of biogenic hydrocarbons from submerged or floating macrophytes to terrestrial plants was suggested by the aquatic macrophyte n-alkane proxy ((n-C 23 þn-C 25 )/(n-C 23 þn-C 25 þ n-C 29 þn-C 31 )) values (0.16-0.26; Supplemental Data, Table S2).…”

Section: Use Of Geochemical Markers To Trace Organic Pollutioncontrasting

confidence: 47%

“…Aliphatic hydrocarbons in the present study were of mainly biogenic origin, as suggested by low L/H (0.04-0.54 with a mean of 0.21) and high carbon preference index (CPI [26][27][28][29][30] Table S5.…”

Section: Biogenic Hydrocarbonsmentioning

confidence: 64%

“…In addition, Sn-C 15-20 /Sn-C 21-35 (L/H) values < 1, approximately 1, and > 2 indicate sources of n-alkanes from higher plants, or bacteria, or both; from petroleum (and plankton); and from fresh oil, respectively [28,29]. Aliphatic hydrocarbons in the present study were of mainly biogenic origin, as suggested by low L/H (0.04-0.54 with a mean of 0.21) and high carbon preference index (CPI [26][27][28][29][30] Table S5.…”

Section: Biogenic Hydrocarbonsmentioning

confidence: 99%

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Application of multiple geochemical markers to investigate organic pollution in a dynamic coastal zone

Liu

Wang

Wong

et al. 2013

Enviro Toxic and Chemistry

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Abstract-Multiple geochemical markers, including aliphatic hydrocarbons (n-alkanes), linear alkylbenzenes (LABs), and polycyclic aromatic hydrocarbons (PAHs), were employed to relate sediment organic chemical pollution in the coastal zone off South China to socioeconomic development there. Concentrations of Sn-C 15-35 (n-alkanes with 15-35 carbon atoms), SLAB (sum of C 10 to C 13 LABs), and S 26 PAH (sum of 26 PAH compounds) ranged from 110 to 3,160, 11 to 160, and 26 to 600 ng/g, with medians of 730, 40, and 230 ng/g, respectively. Natural hydrocarbons were mainly derived from terrestrial higher plant waxes, and in minor amounts from aquatic plankton and bacteria.

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Section: Use Of Geochemical Markers To Trace Organic Pollutioncontrasting

confidence: 47%

Section: Biogenic Hydrocarbonsmentioning

confidence: 64%

Section: Biogenic Hydrocarbonsmentioning

confidence: 99%

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Application of multiple geochemical markers to investigate organic pollution in a dynamic coastal zone

Liu

Wang

Wong

et al. 2013

Enviro Toxic and Chemistry

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“…A bimodal distribution of n-alkanes between nC 17 -nC 36 , with C max at nC 20 and nC 29, was detected as illustrated in Figure 2. This distribution suggests a mixed input of terrestrial and phytoplanktonic/ microbial organic matter.…”

Section: Aliphatic Hydrocarbonsmentioning

confidence: 94%

“…27 There are several reports of the C 20 highly branched isoprenoid alkane being present in freshwater and marine sediments: as is the case in Alfacs Bay (Spain), in Rostherne Mere (U.K.), in Grasmere (U.K.), and in the Gulf of Mexico. 26,27,[34][35][36] It has been identified in the Urubu sediment and also at trace levels in the Ururaí sediment (see Table 2). Elias and coworkers 15 identified the corresponding C 20 alkene in the hipersaline lagoon Lagoa Vermelha, also located in the State of Rio de Janeiro, while Porte and coworkers 37 identified the C 20 , C 25 and C 30 highly branched isoprenoid alkenes in bivalves collected in the Todos os Santos Bay, Brazil.…”

Section: Aliphatic Hydrocarbonsmentioning

confidence: 99%

Aliphatic and aromatic hydrocarbons in tropical recent sediments of Campos dos Goytacazes, RJ, Brazil

Gomes¹,

Azevedo²

2003

J. Braz. Chem. Soc.

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Foram estudados sedimentos recentes dos rios Imbé, Urubu e Ururaí e da Lagoa de Cima, localizados no município de Campos dos Goytacazes, Rio de Janeiro. As frações dos hidrocarbonetos alifáticos e aromáticos foram analisadas por CG-DIC e CG-EM com o objetivo de se verificar o grau de contaminação por atividades antropogênicas ou contribuições biogênicas. A concentração total dos hidrocarbonetos alifáticos e aromáticos foram 1,2 , 2,8 , 5,8 e 4,3 µg g -1 e 74 , 30 , 722 e 340 ng g -1 para os rios Imbé, Ururaí, Urubu e Lagoa de Cima, respectivamente. O isoprenóide C 20 foi identificado no sedimento do Rio Urubu. Em nenhuma das amostras foram encontrados hopanos e esteranos. Compostos aromáticos antropogênicos, detectados ao nível de traços, foram observados somente no rio Imbé e na Lagoa de Cima (227 ng g -1 ). A razão fluoranteno/pireno foi de 4,2 para a Lagoa de Cima, sugerindo uma origem por combustão para os HPA. Este fato é consistente com a prática de queimada de plantações de cana de açúcar que ocorre freqüentemente nesta região. Um grande aporte de plantas superiores foi observado nos sedimentos dos rios Urubu, Imbé e da Lagoa de Cima; por outro lado o aporte predominante no rio Ururaí foi o aquático. A Lagoa de Cima é considerada levemente poluída por HPA, ao nível de traços, enquanto os demais sedimentos não se encontram poluídos.Sediment samples from the Imbé, the Urubu and the Ururaí rivers and from Lake de Cima were studied. These sites are located in the county of Campos dos Goytacazes, Rio de Janeiro, Brazil. Aliphatic and aromatic fractions were analyzed by GC-FID and GC-MS in order to gather information on the degree of contamination by anthropogenic activities and other biogenic contributions. Concentrations of total aliphatic and aromatic hydrocarbons were 1.2, 2.8, 5.8 and 4.3 µg g -1 and 74, 30, 722 and 340 ng g -1 in the Imbé, Ururaí, Urubu rivers and Lake de Cima, respectively. The C 20 highly branched isoprenoid alkane was identified in the Urubu sediment. There were no hopanes or steranes in any sample. Anthropogenic aromatic compounds, detected at trace levels, were observed only in the Imbé and in Lake de Cima (227 ng g -1 ). The fluoranthene/pyrene rate for Lake de Cima was 4.2, suggesting a combustion origin for the PAH. This data is consistent with the frequently sugar cane burning practice that occurs in this region. A greater input from higher plants was observed in the Urubu, Imbé and Lake de Cima sediments; on the other hand, the aquatic input predominates for Ururaí. In summary, Lake de Cima sediment is considered very slightly polluted, while the others are unpolluted. Keywords: hydrocarbons, sediments, PAH, isoprenoid, (C/N) ratios, organic matter IntroductionRecent sediments of natural waters contain variable amounts of organic matter, ranging from less than 1% up to 8% of dry sediment, 1 but are considered rich when they have more than 0.5% of organic matter. 2 It is difficult to obtain detailed information about the sources and transformations of this organic matter by deter...

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Organic pollutants in the coastal environment off San Diego, California. 2. Petrogenic and biogenic sources of aliphatic hydrocarbons

Tran

Zeng

1997

Enviro Toxic and Chemistry

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Abstract-The results from the measurements of aliphatic hydrocarbons suggest that hydrocarbons in the Point Loma Wastewater Treatment Plant (PLWTP) effluents are mainly petroleum derived; those in the Tijuana River runoff have largely originated from terrestrial plants with visible petroleum contamination; and those in the sea surface microlayer, sediment traps, and sediments at various coastal locations off San Diego have mostly resulted from biogenic contributions with enhanced microbial products in the summer season. Rainfall in the winter season appeared to amplify the inputs from terrestrial higher plants to the coastal areas. The PLWTP discharged approximately 3.85 metric tons of n-alkanes (C 10 -C 35 ) in 1994, well below the level (136 metric tons) estimated in 1979. The input of aliphatic hydrocarbons from the Tijuana River was about 0.101 metric tons in 1994. Diffusion, solubilization, evaporation, and microbial degradation seemed partially responsible for the difference in the concentrations and compositions of aliphatic hydrocarbons in different sample media, although the relative importance of each mechanism cannot be readily discerned from the available data. The results from analyses of aliphatic hydrocarbon compositional indices are generally consistent with those of polycyclic aromatic hydrocarbons.

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Hydrocarbons in 60 northeast Gulf of Mexico shelf sediments: a preliminary survey

Cited by 179 publications

References 32 publications

Application of multiple geochemical markers to investigate organic pollution in a dynamic coastal zone

Application of multiple geochemical markers to investigate organic pollution in a dynamic coastal zone

Aliphatic and aromatic hydrocarbons in tropical recent sediments of Campos dos Goytacazes, RJ, Brazil

Organic pollutants in the coastal environment off San Diego, California. 2. Petrogenic and biogenic sources of aliphatic hydrocarbons

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