Evaluation of the influence of urbanization processes using mangrove and fecal markers in recent organic matter in a tropical tidal flat estuary

Grilo, Caroline Fiório; Neto, Renato Rodrigues; Vicente, Maristela de Araújo; Castro, E.V.R. de; Figueira, Rubens César Lopes; Carreira, Renato S.

doi:10.1016/j.apgeochem.2013.08.009

Cited by 30 publications

(20 citation statements)

References 60 publications

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“…The sediments at P1 sampling site showed a high sand content, especially at the bottom of the core; this probably reflects the proximity to the sea and high energy of this site, where mangrove vegetation abundance is low (Grilo et al, 2013). On the other hand, the sediments at P2 and P3 (Figs.…”

Section: Metalmentioning

confidence: 97%

“…/N total ratios, sedimentation rates and total organic carbon (TOC) contents in sediments from Passagem Channel estuary (Espírito Santo State, Brazil) and found a strong terrestrial influence in the sedimentary organic composition and contamination by fecal compounds. Due to the intense urbanization and industrialization of this region (Grilo et al, 2013), human activities may also contribute to metal and petrogenic compounds accumulation, resulting in degradation of water quality. The present study aims to evaluating the trace metals, hydrocarbons (n-alkanes and hopanes) concentrations, calcium carbonate (CaCO 3 ) and d 13 C and d 15 N stable isotopic composition of the same sediment cores as those analyzed by Grilo et al (2013).…”

mentioning

confidence: 99%

“…Due to the intense urbanization and industrialization of this region (Grilo et al, 2013), human activities may also contribute to metal and petrogenic compounds accumulation, resulting in degradation of water quality. The present study aims to evaluating the trace metals, hydrocarbons (n-alkanes and hopanes) concentrations, calcium carbonate (CaCO 3 ) and d 13 C and d 15 N stable isotopic composition of the same sediment cores as those analyzed by Grilo et al (2013). Furthermore, the various urban sources of contaminants inputs to the estuary are discussed.…”

mentioning

confidence: 99%

“…Nevertheless, little is known about the degree of contamination of estuarine sediments in Espírito Santo state. Grilo et al (2013) analyzed triterpenoids, C org. /N total ratios, sedimentation rates and total organic carbon (TOC) contents in sediments from Passagem Channel estuary (Espírito Santo State, Brazil) and found a strong terrestrial influence in the sedimentary organic composition and contamination by fecal compounds.…”

mentioning

confidence: 99%

“…The sediment cores sampling was performed as described in Grilo et al (2013). Briefly, three sediment cores, each ca.…”

mentioning

confidence: 99%

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Evaluation of metals and hydrocarbons in sediments from a tropical tidal flat estuary of Southern Brazil

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Section: Metalmentioning

confidence: 97%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…The sediment cores sampling was performed as described in Grilo et al (2013). Briefly, three sediment cores, each ca.…”

mentioning

confidence: 99%

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Evaluation of metals and hydrocarbons in sediments from a tropical tidal flat estuary of Southern Brazil

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Benthic Estuarine Assemblages of the Eastern Marine Brazilian Ecoregion (EME)

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GC-MS method for determining faecal sterols as biomarkers of human and pastoral animal presence in freshwater sediments

et al. 2015

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In order to determine sterols and stanols in freshwater sediments to reconstruct the past presence of humans and pastoral animals, we developed an analytical method based on pressurised liquid extraction (PLE), clean-up performed using solid phase extraction (SPE) and sterol determination using gas chromatography-mass spectrometry (GC-MS) analysis. PLE extraction conditions were optimised using dichloromethane (DCM) and DCM/methanol mixtures. Clean-up was performed with 2 g silica SPE cartridges, and the concentrated extracts were eluted with 70 mL DCM. Extraction yield was evaluated using an in-house reference material spiked with (13)C-labelled cholesterol and aged for 10 days. In comparison with pre-extraction, where the sediment is extracted and then spiked with a known analyte concentration, this approach preserves the original composition of the sediment. DCM and DCM/methanol mixtures resulted in high extraction yields ranging from 86 to 92 % with good reproducibility (relative standard deviation (RSD) 5-8 %). PLE extraction yields obtained with DCM as the extracting solvent were about 1.5 times higher than extractions using an ultrasonic bath. The solvent extraction mixture and matrix composition strongly affected the solvent extraction composition where higher overall recoveries (70-80 %) for each compound were obtained with DCM. The extraction mixture and matrix composition also affected the analyte concentrations, resulting in a method precision ranging from 1 to 18 %. Diatomaceous earth spiked with 10 to 100 ng of sterols, and environmental samples fortified with suitable amounts of sterols provided apparent recovery values ranging from 90 to 110 %. We applied the method to environmental samples both close to and upstream from sewage discharge zones, resulting in substantially higher faecal sterol (FeSt) concentrations near the sewage. In addition, we also applied the method to a 37-cm freshwater sediment core in order to evaluate its applicability for obtaining vertical sterol profiles.

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Evaluation of the influence of urbanization processes using mangrove and fecal markers in recent organic matter in a tropical tidal flat estuary

Cited by 30 publications

References 60 publications

Evaluation of metals and hydrocarbons in sediments from a tropical tidal flat estuary of Southern Brazil

Evaluation of metals and hydrocarbons in sediments from a tropical tidal flat estuary of Southern Brazil

Benthic Estuarine Assemblages of the Eastern Marine Brazilian Ecoregion (EME)

GC-MS method for determining faecal sterols as biomarkers of human and pastoral animal presence in freshwater sediments

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