210Pb-derived chronology in sediment cores evidencing the anthropogenic occupation history at Corumbataí River basin, Brazil

Bonotto, Daniel Marcos; Lima, Jorge Luis Nepomuceno de

doi:10.1007/s00254-006-0235-z

Cited by 33 publications

(33 citation statements)

References 35 publications

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“…Based on 210 Pbex activities, the constant initial concentration (CIC) model was used to calculate sedimentation rates. The CIC model has been successfully applied in other studies of estuaries (e.g., Bonotto and de Lima 2006), intertidal mudflats (e.g., Andersen et al 2000), and mangrove ecosystems (e.g., Sanders et al 2010). Ages of sediment cores were calculated with the assumption of a constant sedimentation rate (Appleby and Oldfield 1978).…”

Section: Methodsmentioning

confidence: 99%

“…The relative water content was determined after drying. Sediment porosity was calculated based on a sediment density of 2.65 gcm −3 , the sample cube volume (1 cm 3 ) and the bulk dry sediment weight (Baskaran and Naidu 1995;Bonotto and de Lima 2006).…”

Section: Methodsmentioning

confidence: 99%

“…In mangrove ecosystems of the BLE, there are high densities of crabs and mollusks that can cause significant remixing of sediments (Smoak and Patchineelam 1999). In addition, during operation of the hand corer, the mechanical mixing and subsequent diffusion of 210 Pb may occur in the first layers of the sediment cores (Bonotto and de Lima 2006). Thus, the 210 Pbex activities at these depths were not used in the least squares regressions for calculating sedimentation rates (Fig.…”

Section: Pbex Geochronologymentioning

confidence: 99%

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Historical Profiles of Trace Element Concentrations in Mangrove Sediments from the Ba Lat Estuary, Red River, Vietnam

Tuệ

Quy

Amano

et al. 2011

Water Air Soil Pollut

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Historical profiles of trace element concentrations were reconstructed from two mangrove sediment cores collected within the Ba Lat Estuary (BLE), Red River, Vietnam. Chronologies of sediment cores were determined by the 210 Pb method, which showed that each respective sediment core from the south and north entrances of BLE provided a record of sediment accumulation spanning approximately 100 and 60 years. The profiles of Pb, Zn, Cu, Cr, V, Co, Sb, and Sn concentrations markedly increased from the years of the 1920s-1950s, and leveled out from 1950s-1980s, and then gradually decreased from 1980s to present. The profiles of Cd and Ag concentrations increased from 1920s-1940s, and then decreased from 1940s to present. The profile of Mo concentrations progressively increased from 1920s-1980s, then decreased to present. The Mn concentrations failed to show a clear trend in both sediment cores. Results from contamination factors, Pearson's correlation, and hierarchical cluster analysis suggest that the trace elements were likely attributed to discharge of untreated effluents from industry, domestic sewage, as well as non-point sources. Pollution Load Index (PLI) revealed levels higher than other mangrove sediment studies, and the longterm variations in PLI matched significant socioeconomic shifts and population growth in Vietnam. Geoaccumulation Index showed that mangrove sediments were moderately polluted by Pb and Ag, and from unpolluted to moderately polluted by Zn, Cu, and Sb. The concentrations of Pb, Zn, Cu, Cr, and Cd exceeded the threshold effect levels and effect range low concentrations of sediment quality guidelines, implying that the sediments may be occasionally associated with adverse biological effects to benthic organisms.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Pbex Geochronologymentioning

confidence: 99%

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Historical Profiles of Trace Element Concentrations in Mangrove Sediments from the Ba Lat Estuary, Red River, Vietnam

Tuệ

Quy

Amano

et al. 2011

Water Air Soil Pollut

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“…The relative water content was determined after drying. Sediment porosity was calculated based on a sediment density of 2.65 g/cm 3 , the sample cube volume (1 cm 3 ) and the dry sediment weight (Baskaran and Naidu 1995;Bonotto and de Lima 2006).…”

Section: Field Samplingmentioning

confidence: 99%

The application of δ13C and C/N ratios as indicators of organic carbon sources and paleoenvironmental change of the mangrove ecosystem from Ba Lat Estuary, Red River, Vietnam

et al. 2011

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In this study, two sediment cores (*70 cm) were collected from separate mangrove forests straddling the Ba Lat Estuary, Red River of northern Vietnam, to examine the origins of sedimentary organic carbon (SOC) and reconstruct the paleoenvironment. In addition, mangrove leaves and particulate organic matter were collected and measured for d 13 C to trace the origins of SOC. The cores were analyzed by high-resolution sections for d 13 C, TOC, C/N ratios, sediment grain size, water content, and porosity, with values of d 13 C, TOC, and C/N ratios ranging from -28.19 to -22.5%, 2.14-30.94 mg/g, and 10.29-18.32, respectively. The d 13 C and TOC relationship indicated that there were some small residual effects of diagenetic processes on TOC and d 13 C values in mangrove sediments. However, the shifts of d 13 C and C/N ratios from the bottom to the surface sediment of the cores explained the change in organic matter sources, with values of C/N [ 12 and d 13 C \ -25%, and C/N \ 12 and d 13 C [ -25% indicated terrestrial (e.g., mangrove litter) and marine phytoplankton sources, respectively. The covarying d 13 C, C/N ratios, and sediment grain sizes during the past 100 years in sediment cores showed that the paleoenvironment may be reconstructed into three environments (subtidal, tidal flat, and intertidal mangrove). General trends in d 13 C and C/N followed a gradual increase in the C/N ratio and a concomitant decrease in d 13 C from the subtidal, through to tidal flat, and to the intertidal mangrove. d 13 C and C/N ratios are therefore effective in measuring the continuum of environmental change in mangrove ecosystem.

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“…In Brazil the literature regarding to the concentration of these metals in water and sediments of the Piracicaba river basin is limited and related to watersheds with medium to large drainage area (Mortatti and Probst [7]; Jardim et al [8]; Leite [9]; Bonotto and Lima [10]). …”

Section: Introductionmentioning

confidence: 99%

Evaluation of metals in water and sediments of micro-basins in the city of Americana, São Paulo state, Brazil

Medeiros¹,

Tresmondi²,

Queiroz³

et al. 2013

WIT Transactions on Ecology and the Environment

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Water pollution found in major rivers in Brazil has its origin from urban sewage discharges and industrial effluent, carried out by small streams and rivers crossing cities. Therefore, studies related to hydrographic micro-basins offer the opportunity to establish environmental management strategies for restoring water resources, based on diagnosis of the water quality. Despite this understanding, few studies in urban and rural areas have been performed in a systematic manner in Brazilian micro-basins. The main goal of this research was to diagnose the water resources in micro-basins in the region of the district of Americana, São Paulo state, Brazil, through the quantification of metals in water and sediment. The methodology was based on the investigation of metals (Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn), in four micro-basins, determined by inductively coupled plasma optical emission spectrometry (ICP-OES). The most significant result showed high concentration levels of chromium (969 µg L -1 ), downstream of the discharge of sewage from the city of Nova Odessa. This concentration in the river was above the allowed limit of Brazilian regulation agency (50 μg L -1 for Cr). Also high levels of Cr were found in the sediment (98.9 µg g -1 ) collected at the same monitored site. These results are important indicators of environmental performance and anthropogenic activities to help the government establish environmental management strategies aimed at the reduction of water pollution.

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210Pb-derived chronology in sediment cores evidencing the anthropogenic occupation history at Corumbataí River basin, Brazil

Cited by 33 publications

References 35 publications

Historical Profiles of Trace Element Concentrations in Mangrove Sediments from the Ba Lat Estuary, Red River, Vietnam

Historical Profiles of Trace Element Concentrations in Mangrove Sediments from the Ba Lat Estuary, Red River, Vietnam

The application of δ13C and C/N ratios as indicators of organic carbon sources and paleoenvironmental change of the mangrove ecosystem from Ba Lat Estuary, Red River, Vietnam

Evaluation of metals in water and sediments of micro-basins in the city of Americana, São Paulo state, Brazil

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