Sediment Sampling Articles
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PAH analysis and forensic mapping in sediments on Grand Calumet River - Case Study
Sitelab Corporation was hired by an environmental contractor to analyze 100 sediment samples collected from a post-dredge area covering a 1 mile stretch of river in Hammond, Indiana. The data was used to determine which of the 25 sample locations would require further ...
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Antimicrobial resistance (AMR), a bigger threat than COVID19?
When we look back over the past year and half, we can see the impact and devastating consequences of not being able to control or treat a single virus. Now imagine the horror when we can’t even treat a ‘simple’ infection after we graze our knees or cut our finger in the kitchen. This is what is predicted as early as 2050 as a result of the growth of antimicrobial resistance ...
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Comparison of the Conventional Algal Assay and the Algaltoxkit FTM Microbiotest for Toxicity Evaluation of Sediment Pore Waters
Abstract : Conventional algal tests have not been utilized to their full potential for routine toxicity assessments. This is mainly due to the complexicity of these assays and the fact that many operators are still encountering practical difficulties. In view of the need for a cost-effective alternative to standard algal assays for routine testing, a new culture/maintanance free algal test was ...
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Selection of a Battery of Microbiotests for Various Purposes - the Czech Experience
Abstract : Microbiotests are a useful tool in acute toxicity investigations for pre-screening and screening of chemicals and wastes; tests based on enzymatic activity may be useful as a signal for chronic toxicity. The composition of a battery of microbiotests is function of the problem(s) under consideration. A battery of microbioassays should in principle be composed of representatives of the ...
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Contamination levels and potential sources of organic pollution in an Asian river
The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds ...
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The ecological risk assessment and suggestions on heavy metals in river sediments of Jinan
The concentrations of eight heavy metals (Cr, Hg, As, Pb, Cd, Cu, Zn, Ni) in six river sediment samples were collected for evaluation of the degree of the heavy metals pollution distribution and ecological risk of three main rivers' sediments in Jinan. Multivariate statistical techniques were used to determine the most common pollution sources. The results illustrated that all of the metals ...
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Biotic manganese oxidation coupled with methane oxidation using a continuous-flow bioreactor system under marine conditions
Biogenic manganese oxides (BioMnOx) can be applied for the effective removal and recovery of trace metals from wastewater because of their high adsorption capacity. Although a freshwater continuous-flow system for a nitrifier-based Mn-oxidizing microbial community for producing BioMnOx has been developed so far, a seawater continuous-flow bioreactor system for BioMnOx production has not been ...
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How Not to Lose Cadmium While Measuring?
Today cadmium finds a better usage than a hundred years ago. For example, metal cadmium plating is used for anticorrosion coatings that are more stable than zinc, nickel and tin-plated. Cadmium plating of steel parts gives greater resistance to corrosion, especially in sea water. About 20% of cadmium goes to the manufacture of cadmium electrodes used in batteries. Also for the manufacture of ...
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Confirming Natural Attenuation Processes at a Coastal Site - Case Study
Past waste disposal practices at a California coastal site resulted in a groundwater plume containing CVOCs (mainly chlorinated ethenes [CEs] and 1,1-dichloroethane) migrating offshore towards a marine harbor. CVOCs are present in the sediment porewater adjacent to the shoreline, but concentrations decreased significantly between 2000 and 2015, and NA in the marine sediments was suspected. To ...
By SiREM
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Determination of chlorophenols in sediment using ultrasonic solvent extraction followed by solid-phase extraction, derivatization, and GC-MS analysis
A method for determination of chlorophenols (CPs) in sediments was developed using ultrasonic solvent extraction followed by solid-phase extraction, derivatization, and gas chromatography–mass spectrometry (GC-MS) analysis. Some effective operational details and parameters on mixing of samples and extraction solvent, adsorption loss, and extraction cycles of the derivatives were studied and ...
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Antibiotic resistance genes a growing problem in chinese estuaries
Large amounts of antibiotic resistance genes (ARGs) have been found throughout estuaries in coastal China, and scientists say they’re causing potentially dangerous changes to local bacteria. When bacteria mutate and become resistant to antibiotics, it endangers human health and life. If antibiotics can’t work properly, infectious diseases will increase, and health-care costs will ...
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Diffusion flux of phosphorus nutrients at the sediment–water interface of the Ulansuhai Lake in northern China
Overlying water and sediment samples were collected from 11 locations in Ulansuhai Lake in June of 2012 to determine the concentration of dissolved inorganic phosphorus (DIP) in the interstitial water, overlying water and sediment and to estimate the diffusion flux of DIP at the sediment–water interface. The DIP levels in overlying water were 0.004–0.185 mg/L (average = 0.062 mg/L), while ...
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High spatial resolution analysis of the distribution of sulfate reduction and sulfide oxidation in hypoxic sediment in a eutrophic estuary
Bottom hypoxia and consequential hydrogen sulfide (H2S) release from sediment in eutrophic estuaries is a major global environmental issue. We investigated dissolved oxygen, pH and H2S concentration profiles with microsensors and by sectioning sediment cores followed by colorimetric analysis. The results of these analyses were then compared with the physicochemical properties of the bottom ...
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Characteristics of phosphorus sorption at the sediment–water interface in Dongting Lake, a Yangtze-connected lake
Phosphorus in sediments plays an important role in lake eutrophication. This study investigated the phosphorus sorption characteristics of sediments in a river-connected lake and identified the phosphorus source or sink areas in the lake. Sediment samples with different physicochemical characteristics were collected in 2011 and 2013 from Dongting Lake, which is connected to the world's third ...
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Fecal contamination and Microcystis in drinking-water sources of rural Cambodia using PCR and culture-based methods
Rural communities within low-income countries frequently rely on a range of drinking-water sources, and each water source varies in its potential for biological contamination. The extent and source of biological contamination in primary drinking sources within Kien Svay, Kandal, Cambodia, were determined by fecal indicator bacteria (FIB) measurements, 16S rDNA genetic markers for human and ...
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Assessing toxicity of contaminants in riverine suspended sediments to freshwater mussels
The Clinch River in Virginia and Tennessee, USA, is well known for its diverse native freshwater mussel assemblages; however, notable declines in mussel populations in recent decades have prompted much concern and subsequent research. The authors examined the toxicity of recently‐deposited sediments on juveniles of the freshwater mussel Epioblasma brevidens, by collecting time‐integrated ...
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Interlaboratory evaluation of the assessment of arsenic bioaccumulation from field collected sediments using Hexagenia spp.
Standardized bioaccumulation testing of aquatic organisms is essential to understanding the impact of historical contamination on the quality of water and sediment. A standardized 28‐day laboratory bioaccumulation method with a freshwater burrowing mayfly, Hexagenia spp., has been developed and internally validated by the Ontario Ministry of the Environment and Climate Change (MOECC). An ...
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The SediMeter turns 30 years, but where did it come from?
A hundred years ago Physical Geography concerned itself with the description of landforms and processes, and deductions about how these processes had led to those landscapes. Then in the 1930’s a research student in Uppsala called Filip Hjulström crossed the river called Fyrisån every day on his way to the department. He stopped, took a water sample and measured the water level. ...
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Cytotoxic and genotoxic activities of waters and sediments from highway and parking lot runoffs
The genotoxicity of water and sediment samples from stormwater treatment systems and water from urban highway runoff was tested in the Salmonella/microsome assays with Salmonella typhimurium, micronucleus assay (Trad-MN) with plants and with human-derived liver cells (HepG2), or comet assay with HepG2. Cytotoxicity of water samples was studied using either reactive oxygen species (ROS) ...
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Investigation into the bacterial pollution levels at various sites along the Diep and Plankenburg river systems, 3 Western Cape, South Africa
This study sought to investigate and compare bacterial contamination levels at six different sites along the Diep and Plankenburg river systems in the Western Cape, South Africa. Surface water and sediment samples were collected monthly from the six selected sampling sites along both river courses between January 2014 and December 2014 and were evaluated for bacterial contaminants. Microbial ...
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