Showing results for: sediment sampling Articles
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Determination of PBDEs in Sediment Samples using the SpeedExtractor E-914
Polybrominated diphenyl ethers (PBDEs) are flame retardants used in a myriad of applications and are monitored worldwide because of health concerns. In this application, PBDE congeners were extracted from two sediment samples (certified sample and sediment core from Lake Maggiore) according to EPA method 3545A using the SpeedExtractor E-914 and determined by GC-MS/GC-ECD. The results were ...
By BUCHI
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Sauter mean diameter determination for the fine fraction of suspended sediments using a LISST-25X diffractometer
ABSTRACT The L1SST-25X ability for measuring the Sauter mean diameter of the fine fraction of sediment samples, SMD/. is evaluated. A simple algorithm to determine the SMDf is proposed. The algorithm is based on the standard output variables from the L1SST-25X diffractome-ter Sauter mean diameter of the complete sample, SMD(; Sauter mean diameter of the coarse fraction,SMDg; total suspended ...
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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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Extraction of Sediment using the SpeedExtractor E-916 for the Determination of Polycyclic Aromatic Hydrocarbons (PAH)
Polycyclic aromatic hydrocarbons (PAH) are chemical compounds that consist of fused aromatic rings and do not contain heteroatoms or carry substituents. They are of concern because some compounds have been identified as carcinogenic, mutagenic and teratogenic. Sediment samples origin from a round robin program (SETOC 2008/4, Wepal, Wageningen University) were extracted according to EPA 3545A with ...
By BUCHI
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Metal speciation in sediment in West Lake (Ho Tay), Hanoi, Vietnam
The speciation patterns of Cd, Cr, Cu, Mn, Pb and Zn in 24 sediment samples from West Lake, Vietnam were investigated using a sequential extraction scheme modified from Tessier et al. The results indicated that only a very small portion of the total metal was easily available (found in the exchangeable ( Cd > Zn > Pb > Cr > Cu. Significant correlations among all extracted fractions for all six ...
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Partitioning of perfluorooctanesulfonate and perfluorohexanesulfonate in the aquatic environment after an accidental release of Aqueous Film Forming Foam at Schiphol Amsterdam Airport
In the summer of 2008, an accidental release of Aqueous Film Forming Foam (AFFF) took place at Schiphol Amsterdam Airport (The Netherlands). After the release, water, fish and sediment samples were collected and analyzed for perfluoroalkyl sulfonates (PFSA). In situ perfluorooctane sulfonate (PFOS) KD values, BAF and BSAF values showed a remarkable agreement among reference and impacted sites, ...
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Extraction of Sediment using the SpeedExtractor E-916 for the determination of Polychlorinated Biphenyls (PCBs)
PCBs were used as coolants and dielectric fluid in transformers, as flame retardants, hydraulic fluids and additives in plastics and for many other applications until the 1980s. They are toxic, persistent and bioaccumulate in terrestial and aquatic biosystems and due to atmospheric effects they are ubiquitous in the environment. Sediment samples from a round robin program (SETOC 2008/4, Wepal, ...
By BUCHI
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The inter-tidal zone is the pathway of input of enterococci to a subtropical recreational marine beach
Efforts were made to evaluate the source of enterococci levels at a recreational beach. Four monitoring efforts were implemented which included tidal studies, hourly sampling, runoff sampling, and spatially intensive sediment sampling. Spatially intensive sediment sampling indicated that enterococci concentrations consistently decreased away from the inter-tidal zone, both seaward and landward. ...
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Distribution, fraction and risk assessment of vanadium in surface sediments from a Chinese karstic lake: a case study of Hongfeng Lake
The distribution characteristics of vanadium and its fraction based on the Tessier sequential extraction method were studied in surface sediment samples collected from Hongfeng Lake. The results of this study indicated that the total amount of vanadium in the sediment samples ranged from 124.0 to 213.0 mg/kg. The average percentages of exchangeable, bound to carbonates, bound to Fe–Mn oxides, ...
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Identification and distribution of petroleum hydrocarbons in sediments, seawater and Ruditapes decussatus collected from a Mediterranean Sea site
The goal of this study was to assess the degree of pollution in three different matrices in the navigation canal of Tunis. Using appropriate techniques we showed that Total Hydrocarbons (THCs) in the sediment samples ranged from 160 mg/kg to 5500 mg/kg. But in the seawater the THCs ranged from 2 mg/L to 80 mg/L due to petroleum hydrocarbons. The Total Aliphatic Hydrocarbons (TAHs) in R. ...
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Determination of PBDEs in Sediment Samples using Pressurized Solvent Extraction and Automated Soxhlet Extraction
The efficiency of pressurized solvent extraction (PSE) was investigated by comparing PSE with automated Soxhlet extraction. Sediment samples containing polybrominated diphenylethers (PBDEs) were processed in the SpeedExtractor E-914 for PSE and the Extraction System B-811 for automated Soxhlet extraction. Quantification of PBDEs was performed by GC-MS. This study shows that both techniques are ...
By BUCHI
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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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Levels and distribution of organochlorine pesticides in surface sediment after flood season from the old Yellow River Estuary, China
Organochlorine pesticides (OCPs) are characterized by ubiquity, bioaccumulation and persistence in the environment and are of worldwide concern. Sixteen surface sediment samples were analyzed for hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) to provide information on the levels, distribution and sources of these compounds after flood season in the old Yellow River ...
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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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Macrozoobenthos interlaboratory comparison on taxonomical identification and counting of marine invertebrates in artificial sediment samples including testing various statistical methods of data evaluation
Abstract A macrozoobenthos interlaboratory comparison was carried out by 16 laboratories to check the taxonomical expertise and the precision of sorting and counting. Participating laboratories had to determine and count in an artificial sediment sample 22 selected macrozoobenthos species taken from the western Baltic Sea. Two methods for the analysis of data were applied: assessment of ...
By QuoData GmbH
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Enteric viruses in surface water and sediment samples from the catchment area of Peri Lagoon, Santa Catarina State, Brazil
This paper aims to quantify human adenovirus (HAdV), rotavirus species A (RVA), and hepatitis A virus (HAV) in surface water and sediments and to determine the viability of HAdV in these samples. Water and sediment samples were collected, and HAdV, RVA, and HAV were quantified by real-time polymerase chain reaction (PCR); HAdV was also evaluated for infectivity by a plaque assay (PA). For the ...
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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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Eijkelkamp equipment reveals 100.000 year old records of environmental change - Case Study
Michael Bird of the James Cook University (Centre for Tropical Environmental & Sustainability Sciences) in Cairns and his team are looking for 100.000 year old records of environmental change in the north of Australia. Michael Bird uses Eijkelkamp equipment to take sediment samples. Check the 2 minute video for a research report from the tropical north of Australia. Long lake sediment ...
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Purge Trap for GC Analyses of Volatile Aromatic (BTEX) Compounds in Soils and Sediments
The BTEXTRAP purge trap was designed specifically for monitoring benzene, toluene, ethylbenzene, and the xylene isomers (BTEX compounds). The trap allows large amounts of methanol (used in the US EPA Method 5030 procedure for preparing soil and sediment samples) to pass through the adsorbent beds while retaining the analytes of interest. In evaluations of trap performance, relative analyte ...
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