Sewage contamination of Amazon streams crossing Manaus (Brazil) by sterol biomarkers

Melo, Moacir Guimarães de; Silva, Brina Aguiar da; Costa, Gilcllys de Souza; Neto, João Cândido André da Silva; Soares, Patrícia Kaori; Val, Adalberto Luı́s; Chaar, Jamal da Silva; Koolen, Héctor H. F.; Bataglion, Giovana A.

doi:10.1016/j.envpol.2018.10.055

Cited by 30 publications

(32 citation statements)

References 60 publications

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“…The city is criss-crossed by several streams that flow into the Negro river, which, after meeting the Solimões river is called the Amazon. Of these streams, Tarumã-Açu, Mindu, and Quarenta are the most important that cross Manaus [9,28]. The Mindu and Quarenta streams receive effluents from many heavily populated districts of the city [9,28].…”

Section: Study Area and Sample Collectionmentioning

confidence: 99%

“…Of these streams, Tarumã-Açu, Mindu, and Quarenta are the most important that cross Manaus [9,28]. The Mindu and Quarenta streams receive effluents from many heavily populated districts of the city [9,28]. Furthermore, the Quarenta stream receives effluents from the industrial district of Manaus [9,28].…”

Section: Study Area and Sample Collectionmentioning

confidence: 99%

“…The Mindu and Quarenta streams receive effluents from many heavily populated districts of the city [9,28]. Furthermore, the Quarenta stream receives effluents from the industrial district of Manaus [9,28]. The Tarumã-Açu stream is located in a peri-urban area and is mostly surrounded by vegetation.…”

Section: Study Area and Sample Collectionmentioning

confidence: 99%

“…The Tarumã-Açu stream is located in a peri-urban area and is mostly surrounded by vegetation. Although, activities such as family farming, boat repair, marinas, a floating petrol station, and floating bars and restaurants, exist in the region [9]. The study area and sampling stations are shown in Figure 1, and geographic coordinates are shown in Table S1 (see Supplementary Material).…”

Section: Study Area and Sample Collectionmentioning

confidence: 99%

“…Part of this complexity relies on the composition of the sedimentary organic matter (SOM) in waterbodies, which include compounds of autochthonous and allochthonous origin [3]. With this in mind, several classes of geochemical biomarkers and/or persistent organic pollutants have been addressed in order to study the short-or long-term impacts of natural or anthropogenic pressures on the Amazon waterbodies [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Metals, n-Alkanes, Hopanes, and Polycyclic Aromatic Hydrocarbon in Sediments from Three Amazonian Streams Crossing Manaus (Brazil)

et al. 2020

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Pollution is increasing in the Amazon region and its real impact is still unclear. Since this region is of great interest to the global community, this study aimed to assess geochemical biomarkers and metals in sediments from three streams crossing Manaus, a Brazilian city of 2.1 million inhabitants located in the heart of the Amazon rainforest. The Mindu and Quarenta streams criss-cross the urban area of Manaus and receive domestic effluents from many heavily populated districts. In addition, the Quarenta stream is subjected to effluents from the industrial district of Manaus. The Tarumã-Açu stream is mostly covered by vegetation, although the region presents some occurrence of family farming, floating petrol station, marinas, and floating restaurants and bars. n-Alkanes were determined by Gas Chromatography with Flame Ionization Detection (GC-FID), whereas hopanes and polycyclic aromatic hydrocarbons (PAHs) were determined by Gas Chromatography coupled to Mass Spectrometry (GC-MS). The metals Ag, Cd, Cr, Co, Cu, Mn, Ni, Pb, and Zn were determined by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) after microwave-assisted acid digestion. Concentrations of total PAHs and metals were higher in sediments from the urban streams Mindu and Quarenta because of the occurrence of more intense and diverse sources of pollution. In addition, some sediment samples from both these streams presented concentrations of fluoranthene, phenanthrene, and metals higher than the limits of low probability of adverse effects on biota established by the international guideline and by the Brazilian legislation. A similar total n-alkane concentration for sediments from all streams associated with profiles of n-alkanes with no odd/even hydrocarbon predominance suggests that biomass burning is an important source of hydrocarbons. Petroleum-derived products also represented a source for n-alkanes, as confirmed by the presence of α,β-hopanes, including an α,β-homohopane series from C31 to C35 with the presence of both 22S and 22R epimers. This is the first report on n-alkanes, PAHs, and hopanes in sediments from the Mindu, Quarenta, and Tarumã-Açu streams. The concentrations reported herein may be considered as baseline data in future monitoring programs of these streams.

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Section: Study Area and Sample Collectionmentioning

confidence: 99%

Section: Study Area and Sample Collectionmentioning

confidence: 99%

Section: Study Area and Sample Collectionmentioning

confidence: 99%

Section: Study Area and Sample Collectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metals, n-Alkanes, Hopanes, and Polycyclic Aromatic Hydrocarbon in Sediments from Three Amazonian Streams Crossing Manaus (Brazil)

et al. 2020

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Limnological perspectives on conservation of floodplain lakes in the Amazon basin

Mélack

Kasper

Amaral

et al. 2021

Aquatic Conservation

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Limnological aspects of Amazon floodplain lakes are examined in the context of aquatic conservation. A prerequisite to detecting and evaluating changes that could threaten the ecological health and organisms in floodplain lakes is understanding variation under present conditions. Based on one of the few studies with regular measurements over 2 years, chlorophyll, total phosphorus, dissolved oxygen, transparency, and total suspended solids in Lake Janauacá indicate that the lake is naturally quite variable with a mesotrophic to eutrophic status. Direct threats to ecological health of floodplain lakes include mining operations that can increase turbidity and trace metals and reduce nutritional quality of sediments. Mercury contamination and methylation leads to bioaccumulation in aquatic organisms. Deforestation in uplands increases nitrogen and phosphorus inputs to floodplain lakes and can alter trophic status. Deforestation in floodable forests alters the habitat and food of the fish that inhabit these forests. Cumulative limnological responses as catchments are altered by urban, agricultural, and industrial developments, and as inundation is altered by changes in climate and construction of dams, have major implications for the ecology of floodplain lakes. To improve understanding and management of threats to the conservation of aquatic Amazon biota and ecosystems requires considerably expanded and coordinated research and community‐based management that includes the spectrum of floodplain lakes throughout the basin.

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Development of a bio‐inspired magnetic nanocomposite synthesized through semi‐covalent imprinting for electrochemical determination of cholesterol in water samples

Peixoto Lins,

Effting,

Maria Effting

et al. 2023

Electroanalysis

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Sewage contamination of Amazon streams crossing Manaus (Brazil) by sterol biomarkers

Cited by 30 publications

References 60 publications

Metals, n-Alkanes, Hopanes, and Polycyclic Aromatic Hydrocarbon in Sediments from Three Amazonian Streams Crossing Manaus (Brazil)

Metals, n-Alkanes, Hopanes, and Polycyclic Aromatic Hydrocarbon in Sediments from Three Amazonian Streams Crossing Manaus (Brazil)

Limnological perspectives on conservation of floodplain lakes in the Amazon basin

Development of a bio‐inspired magnetic nanocomposite synthesized through semi‐covalent imprinting for electrochemical determination of cholesterol in water samples

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