sediment profiler Articles
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210Pb geochronology of sediments from the Guama River and Guajara Bay in the Amazon region, Belem, Brazil
This study chronologically dated three sediment profiles collected at the mouth of the Amazon River using the 210Pb geochronology method. All profiles were sliced into 5 cm layers and analysed for radionuclides through gamma spectrometry. The results obtained dated the sediments as far back as 65 years. The sedimentation rate was also determined. A subsequent interpretation of the results ...
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Polycyclic aromatic hydrocarbons (PAH) in top soil, leachate and groundwater from Ruseifa solid waste landfill, Jordan
The distribution profiles and pathways of polynuclear aromatic hydrocarbons in the surroundings of Ruseifa landfill area in Jordan were investigated for surface sediments, leachate, and groundwater. The total concentration of 16 polycyclic aromatic hydrocarbons (PAHs) in sediments ranged from 286 to 1704 ppm with an average value of 751 ppm. Meanwhile, concentrations of PAH in groundwater ranged ...
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Reconstructing the ecological impacts of eight decades of mining, metallurgical and municipal activities on a small boreal lake in northern Canada
As a result of long‐term metal mining and metallurgical activities, the sediment of Ross Lake (Flin Flin, MB, Canada) is highly contaminated with metals and other elements. Although it is likely that effluents were discharged into Ross Lake as early as the late 1920 s, lake biophysical data were not collected until 1973, more than four decades after the onset of mining and municipal ...
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Application of diffusive gradients in thin films and core centrifugation methods to determine inorganic mercury and monomethylmercury profiles in sediment pore water
A diffusive gradient in thin films (DGT) is an in situ sampling technique for the quantitative analysis of contaminant concentrations that is based on the diffusion and adsorption of contaminants onto resin gels. In the current study, a DGT technique was applied to measure total mercury (Hg) and monomethylmercury (MMHg) concentrations in lake and coastal sediment pore waters and to compare ...
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Impact of sedimentation on wetland carbon sequestration in an agricultural watershed
Received for publication January 9, 2008. Landscape redistribution of soil C is common within agricultural ecosystems. Little is known about the effects of upland sediment deposition on C dynamics within riparian wetlands. To assess sedimentation impact, we obtained profile samples of wetland soil and used the combination of 137Cs, 210Pb, and 14C chronological markers to determine rates of C ...
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Monitoring accumulation sediment characteristics in full scale sewer physical model with urban wastewater
A series of experiments were carried out with real wastewater in a pilot flume located at A Coruña wastewater treatment plant (WWTP) (Spain). A full scale model was developed to test a circular (300 mm inner diameter) and an equivalent area egg-shaped plastic pipe under controlled experimental conditions (pipe slope 2–5‰, averaged discharge Q = 4 L/s). Velocity profiles and sediment ...
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Case study - Grand Forks wastewater authority - North Dakota, U.S.A.
Service: SmartBall - Leak & Gas Pocket Detection Client: Grand Forks Wastewater Authority Project Date: 2008 Type of Pipeline: Force Main Diameter: 30- and 36-inch Pipe Material: PCCP and PVC Length: 46,464 Feet Pressure: Results: 6 Gas Pockets In late October 2008, the Grand Forks Wastewater Authority (Authority) located in Grand Forks; North Dakota initiated a project to ...
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Spatial distribution characteristics of polycyclic musks as a chemical marker in river water and sediment compared with other typical pollutants
Polycyclic musks (PMs), widely used in the cosmetic and perfume industries, are gaining attention as a new type of persistent organic pollutant (POP). The related contamination in developing countries, such as China, where the use of these compounds is increasing, needs to be closely monitored. This work systematically studied the distribution profile (water-suspended ...
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Identification of perylene in sediments: Occurrence and diagenetic evolution
Abstract: Perylene and penta-aromatic hydrocarbons were determined in sediments as part of a study that was dedicated to the aquatic ecosystem of Elelenwo Creek (Southern Nigeria) in order to carry out a critical corroboration of occurrence and diagenetic evolution of perylene in the sediments of the creek. The results show that the annual mean levels of Benzo [g, h, i] Perylene ranged from ...
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Quantifying uncertainty in the trophic magnification factor related to spatial movements of organisms in a food web
Trophic magnification factors (TMFs) provide a method of assessing chemical biomagnification in food webs and are increasingly being used by policy makers to screen emergent chemicals. Recent reviews have encouraged the use of bioaccumulation models as screening tools for assessing TMFs for emergent chemicals of concern. The present study used a food web bioaccumulation model to estimate TMFs ...
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Grain size distribution and sediment flux structure in a river profile, measured with a LISST-SL instrument
Abstract New data on sediment transport in a river are reported using a LISST-SL laser diffraction instrument that simultaneously measures velocity, optical transmission, depth, temperature, and sediment particle size distribution (PSD) isokinetically. Suspended sediment concentration (SSC)is obtained from the sum of PSD. Optical transmission is seen to be nearly constant in the top 3.5m of the ...
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Integrative assessment of selenium speciation, biogeochemistry and distribution in a northern coldwater ecosystem
For the past decade, considerable research has been conducted at a series of small lakes receiving treated liquid effluent containing elevated selenium (Se) from the Key Lake uranium milling operation in northern Saskatchewan, Canada. Several studies related to this site, including field collections of water, sediment, and biota (biofilm/periphyton, invertebrates, fish, and birds), ...
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