comparison of concentrations of organic chemicals in streambed sediment samples from the salem area with willamette basin concentrations nationwide concentrations and sediment quality guidelines total ddd is the sum of o p ddd

Selected Elements and Organic Chemicals in Streambed Sediment in the Salem Area, Oregon, 1999 pot

Ngày tải lên : 28/03/2014, 19:20

... nationwide concentrations, and sediment quality guidelines [Total DDD is the sum of o, p -DDD and p, p’ -DDD; total DDE is the sum of o, p -DDE and p, p’-DDE; and total DDT is the sum of p, p’ -DDD, p, p’-DDE, ... oxychlordane b Total DDD is the sum of o, p -DDD and p, p’ -DDD cTotal DDE is the sum of o, p -DDE and p, p’-DDE dTotal DDT is the sum of p, p’ -DDD, p, p’-DDE, and p, p’-DDT e Also exceeded the PSDDA ... cis-chlordane, trans-chlordane, cis-nonachlor, trans-nonachlor, and oxychlordane b Total DDD is the sum of o, p -DDD and p, p’ -DDD c Total DDE is the sum of o, p -DDE and p, p’-DDE d Total DDT is...

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Uptake of organic chemicals in plants Human exposure assessment ppt

Ngày tải lên : 05/03/2014, 20:20

... are input to the models The daily dietary exposure is then found from the modelled concentrations in food together with the consumption of each food item Inhalation and soil ingestion are also included ... established for the prediction of the uptake of organic contaminants from soil into plants 9.4.1.1 The regression of Travis and Arms A frequently applied regression for the uptake of organic contaminants ... conclusion from this is that the equilibrium approach for roots used in the TGD grossly overestimates the exposure from roots for lipophilic compounds Whereas, the dynamic root model used in the...

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Remediation of Organic Chemicals in the Vadose Zone docx

Ngày tải lên : 14/03/2014, 19:20

... at removing organic compounds from the vadose zone For example during one of the applications of the ISTD process, the concentration of PCBs in soil was reduced from more than 500,000 ppb to an ... an offgas treatment system and blower(s) comprise the majority of capital costs Operating and maintenance (O& M) costs include the costs of supplying power for the blower(s) and for operation of ... capacity of the gas phase of the contaminant For example, a compound with a vapor pressure of 0.1-mm Hg at 25°C can achieve a vapor concentration up to 5.4 micromoles per liter of air, corresponding...

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A Generic QSAR for Assessing the Bioaccumulation Potential of Organic Chemicals in Aquatic Food Webs pot

Ngày tải lên : 22/03/2014, 14:20

... as the safe consumption of fish and sport fish The methodology for the derivation of the TMDL typically involves the development of a mass balance model relating the loading to water and sediment ... temperature Weight of organism Lipid content of organism Lipid content of lowest trophic level organisms Concentration of particulate organic carbon Concentration of dissolved organic carbon ... Model Development: Bioaccumulation is the result of competing processes of chemical uptake into and chemical elimination from the organism (Figure 1) The major routes of uptake include absorption...

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ANAEROBIC BIODEGRADATION RATES OF ORGANIC CHEMICALS IN GROUNDWATER: A SUMMARY OF FIELD AND LABORATORY STUDIES pdf

Ngày tải lên : 28/03/2014, 19:20

... FL, helped with the conceptualization of microbial processes and mechanisms represented in the protocol, played a key role in the laboratory protocol developed earlier and published in the Federal ... Conservation and Recovery Act (RCRA) of 1976 the U.S EPA is appointed the task of managing these risks through the development and implementation of regulations To this end, the EPA develops and ... Register and provided continuity with the previous efforts Drs Parmelli Pritchard, formerly with U.S EPA, and Bob Boethling, OPPTS, U.S EPA, Dr Jack Jones of the U.S EPA, Ecosystems Support Division,...

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AEROBIC BIODEGRADATION OF ORGANIC CHEMICALS IN ENVIRONMENTAL MEDIA: A SUMMARY OF FIELD AND LABORATORY STUDIES pot

Ngày tải lên : 28/03/2014, 19:20

... and the availability and concentration of the substrate The Monod equation was developed to describe the growth of a population of microbes in the presence of a carbon source At low concentrations ... convenient approximation of the kinetics of degradation of test substrates where there is no growth of the microbial population and a low concentration of the test substrate is present Under these ... established either from the discussion in the paper or from looking at the data, and an appropriate initial and final concentration was chosen The value used for the initial concentration was the concentration...

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Báo cáo y học: "Quality of life effects of antithrombin III in sepsis survivors: results from the KyberSept trial [ISRCTN22931023]" potx

Ngày tải lên : 12/08/2014, 18:21

... common among the in- hospital group at 90 days, 87% in the placebo group received heparin as compared with 70% of those receiving AT III Comparing AT III groups across populations, the use of concomitant ... for the AT III groups was similar There was a shift toward the lower risk strata of SAPS II score from the overall population to the all-survivors population, whereas the risks in the in- hospital ... to concomitant heparin administration In this population 71% of placebo patients were administered heparin concomitantly; 68% of those administered AT III received heparin Among the in- hospital...

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Tài liệu Environmental impacts of petroleum production: Fate of inorganic and organic chemicals in produced water from the Osage-Skiatook Petroleum Environmental Research sites, Osage County, Oklahoma doc

Ngày tải lên : 14/02/2014, 03:20

... chemical composition of water from these samples It includes dilution of produced water source, followed by dissolution of gypsum and dolomite and precipitation of calcite (reactions 10, and 6, ... showing the salinity of water and the relative concentrations (in equivalent units) of major cations and anions from the main brine pit and Geoprobe wells located to the southeast of this pit; ... (inorganic and organic) and isotopic composition of selected water samples from OSPER site B continued Table Important water-mineral interactions at OSPER sites that modify the chemical composition...

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Tài liệu Literature Review of Organic Chemicals of Emerging Environmental Concern in Use in Auckland ppt

Ngày tải lên : 14/02/2014, 03:20

... region of concern Over and beyond the task of compiling existing toxicological and environmental chemical information of thousands of compounds, a reviewer is faced with the principal issue of attempting ... uncoupler of oxidative phosphorylation Other mitochondrial poisons, including the fish toxin and insecticide rotenone, can inhibit the electron transport chain (preventing NADH from being converted ... include paints and coatings (eg, powder coatings for washers and other "whiteware”, corrosion protection of steel pipes and concrete reinforcing rebar, primers to improve the adhesion of automotive...

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Tài liệu Investigation of Organic Chemicals Potentially Responsible for Mortality and Intersex in Fish of the North Fork of the Shenandoah River, Virginia, during Spring of 2007 ppt

Ngày tải lên : 14/02/2014, 08:20

... Because of the strong sorptive properties of the adsorbents used in the POCIS, attempts to incorporate PRCs into the POCIS have failed (Alvarez and others, 2007) Uptake of hydrophobic chemicals into ... unknown; however, the input of anthropogenic organic chemicals (AOCs) into the basin may be a factor The U.S Geological Survey in cooperation with the Friends of the North Fork of the Shenandoah ... Laboratory Friends of the North Fork of the Shenandoah River Prepared in cooperation with the Friends of the North Fork of the Shenandoah River Open-File Report 2008–1093 U.S Department of the Interior...

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Transport and fate of persistent toxic organic chemicals in aquatic ecosystems: the Niagara River to St Lawrence River Estuary example pptx

Ngày tải lên : 22/03/2014, 14:20

... Accumulation and/ or sorption of PTOCs into these organisms, both when alive and dead, is rapid In the Niagara River, the concentrations of some PTOCs in suspended particulates at the inflow to Lake Ontario ... in Lake Ontario have been predator fish and the eggs of fish-eating herring gulls In these media, PTOCs often in the ppm or high ppb range PTOC concentration trends in most predatory fish from ... sediments, are made up primarily of inorganic material and have an organic carbon content of only some % or less However, some of this organic content can be in the form of thin organic coatings...

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Monitoring and assessing processes of organic chemicals removal in constructed wetlands doc

Ngày tải lên : 28/03/2014, 19:20

... Sorption and sedimentation Sorption of a chemical to soil or sediment may result from the physical or chemical adhesion of molecules to the surfaces of solid bodies, or from partitioning of dissolved ... reduction of alternative electron acceptors (NO , SO2 , HCO and possibly FeOOH and MnO2) in wetlands mainly depends on the soil type, and the electron donor to acceptor ratios of the inuent water, ... microaerophilic sediments in most parts of the systems The concurrent oxygen consumption during microbial degradation of naturally-occurring organic matter outside of the contaminant pool, and the...

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Genotoxicity of 255 chemicals in the Salmonella microsome test (Ames test) and 8-hydroxyguanine (8-OH-Gua) assay for the detection of carcinogens

Ngày tải lên : 05/09/2013, 08:40

... Identification of C8-modified deoxyinosine and N2- and C8-modified deoxyguanosine as major products of the in vivo reaction of N-hydroxy-6-aminochrysene with DNA and the formation of the adducts in isolated ... using different methods (gas chromatograph-mass spectrometry, 3 2P postlabeling method, etc.) Therefore, it is important to develop a simple rapid in vitro method for evaluating the generation of ... project The research on the development of the total evaluation technique for the hazardous impacts by the chemical substances towards human and ecology (the project leader is Prof Hideo Utsumi,...

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Tài liệu Risk Characterization, Assessment, and Management of Organic Pollutants in Beneficially Used Residual Products pdf

Ngày tải lên : 14/02/2014, 03:20

... experience specific to the determination of organic compound concentrations in biosolids, the reported levels of organic compounds in biosolids should be considered suspect POLYCHLORINATED BIPHENYL ... of risk for the chemicals of concern The complexity of the mathematical models depends on inputs but, in general, the more numerous the inputs or assumptions, the more complex the model and the ... IN BIOSOLIDS consumption by the target population A common criticism of this method is that selection of single-point estimates are subjective and profoundly affect the prediction of risk In addition,...

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Tài liệu CONSUMER PREFERENCE AND CONSUMPTION OF ORGANIC PRODUCTS IN THE EASTERN CAPE PROVINCE OF SOUTH AFRICA docx

Ngày tải lên : 14/02/2014, 03:20

... travel and education Many taboos concern the consumption of protein-rich animal foods, often by those groups of the community most in need of protein A common taboo in Africa against the consumption ... positively on the consumer’s confidence of the product and is an indication of the trust of the organic label 12 Conclusion This paper has established the growing importance of organic products in the ... consumers who shop in supermarkets reported that local shops not provide the services people demand and that food choice and quality are limited This is coupled with discount promotions common...

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Tài liệu Nonequilibrium transport and sorption of organic chemicals during aquifer remediation doc

Ngày tải lên : 14/02/2014, 08:20

... ^ O ON 0 C4 NO NO NO 00CNt 00ONONONON mt~~^OONONONONONONON ^ O C O N O N O N O N O N O N O N O N ONONONONONONONONONON • - H t - t - T - i o o o o o o U ush ctor > o 0> O »H O H H M N H O K O O ... O , > w

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TOXICITY OF ORGANIC CHEMICALS TO EMBRYO-LARVAL STAGES OF FISH potx

Ngày tải lên : 05/03/2014, 20:20

... good reprQducibility of exposure concentrations for both volatile and insoluble toxicants The most toxic compounds included Capacitor 21, chlorobenzene, 2,4-dichlorophenol, and phenol Chlorobenzene ... effects of the eleven organics on fish embryos and larvae, the more toxic compounds included Capacitor 21, chlorobenzene, chloroform, dichlorophenol, and ph~nol and the least toxic were OOP and NTA ... supported on the constricted upper wall of the stirring compartment (Figure 3) Access to test organisms was obtained by opening the watertight joint and removing the chamber cover Prior to opening...

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PURIFICATION OF ORGANIC CHEMICALS pot

Ngày tải lên : 05/03/2014, 21:20

... EXPLOSION with acetone vapour Organic impurities have been removed from acetone by adding 4g of AgN03 in 3Oml of water to 1L of acetone, followed by lOml of M NaOH, shaking for lOmin, filtering, ... 0.4 on paper chromatography with CHC13EtOH (2:8) as solvent and developed with ammoniacal AgN03 Also crystallises in needles from EtOAc containing a few drops of Me2CO It is hygroscopic and should ... acetyl chloride Small amounts of acetone can be purified as the NaI addition compound, by dissolving l00g of finely powdered NaI in 400g of boiling acetone, then cooling in ice and salt to -go Crystals...

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Supply Chain of Organic Products in Bulgaria ppt

Ngày tải lên : 14/03/2014, 20:20

... chain with food products applies to certified organic foods as well The adoption of the principles of HACCP in ensuring safety and quality of food products is mandatory in Bulgaria under the Foodstuff ... Control along the supply chain of organic food from production and processing to selling plays an important role in maintaining the quality and safety 3.4 Ranking the outlets for sale of organic ... development of organic farming are the problems in the supply chain of organic products The paper will provide a comprehensive overview of current status and prospects for development of organic food...

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EVALUATING THE SUBSURFACE FATE OF ORGANIC CHEMICALS OF CONCERN USING THE SESOLL ENVIRONMENTAL FATE MODEL potx

Ngày tải lên : 22/03/2014, 14:20

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