physical and chemical properties of organic matter in water soils air and waste
Báo cáo khoa học: "Initial mineralization of organic matter in a forest plantation soil following different logging residue management techniques" pps
... maintained The main objective of this research was to examine the effect of harvesting and slash management on mineralization of soil organic matter in a forest soil intensively managed In a previous ... year, winter is the most humid season and intense rainstorms occur in spring and autumn Precipitation is usually in the form of rain, with infrequent, nonpersistent snow during cold winters The ... population and its activity The incorporation of logging residues into the mineral soil implied higher rates of soil biological processes, which resulted in increased organic matter decomposition and in...
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geochemical characterization of organic matter in victoria harbour sediments, hong kong
... 1.1) in Hong Kong, resulting in an increase of raw sewage and wastewater effluents being discharged into the harbour This also led to the need for more land area resulting in large-scale dredging ... summarizing methodology for separating and isolating lipid groups from marine sediments ………………………………… 25 Incorporation of carbon into organic matter utilizing the C3 pathway (from Fogel and Cifuentes, ... determine the sources of organic matter, evaluate changes in environmental conditions, and to ascertain whether remnants of bacterial lipids might be present to enhance our understanding of processes...
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PREDICTION OF CHEMICAL REACTIVITY PARAMETERS AND PHYSICAL PROPERTIES OF ORGANIC COMPOUNDS FROM MOLECULAR STRUCTURE USING SPARC pptx
... as shown in Table SPARC has been in use in Agency programs for several years, providing chemical and physical properties to Program Offices (e.g., Office of Water, Office of Solid Waste and Emergency ... measurement efforts involving thousands of chemicals In fact, physical and chemical properties have only actually been measured for about percent of the approximately 70,000 industrial chemicals listed ... and is greater than the pKa of pyridine (5.2) In this case, the NH2 induces charges ortho and para to the in- ring N These charges interact indirectly with the dipole of the nitrogen in the ring...
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Tài liệu PHYSICAL AND CHEMICAL ASPECTS OF ORGANIC ELECTRONIC doc
... contact resistance and of course the presence of domain boundaries defects and impurities in the organic semiconductor The determination of the true intrinsic mobility of an organic semiconductor ... various aspects of OFETs, including the synthesis of new materials, preparation and characterisation of organic thin films, characterisation of device properties and the development of new device ... again on thiophenes, one of the most promising materials within organic electronics, where in particular the implications of minimising the size of the operating devices are discussed In a working...
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Controls of bioavailability and biodegradability of dissolved organic matter in soils
... uptake and degradation of organic matter by microorganisms, then DOM should play a key role in the stabilisation and destabilisation of soil organic matter, and thus, in C dynamics and C pools of soils ... potential and fractions of organic carbon in air- dried and field-moist soils Soil Biol Biochem 20, 737 – 741 Blaser, P., 1994 The role of natural organic matter in the dynamics of metals in forest soils ... Biodegradation; Dissolved organic matter; DOC Introduction In the past 10 years, much progress has been made in the understanding of dissolved organic matter (DOM) functions and dynamics in soils Today, it...
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Fouling and accumulation of dissolved organic matter in membrane bioreactors
... concern in water and wastewater treatment systems In drinking water production, DOM is identified to be the main cause of fouling during microfiltration/ultrafiltration of surface water, resulting in ... in which DOM is characterized in water and its inorganic constituents, and studies of DOM fractions isolated from water and inorganic constituents (Leenheer and Croué, 2003) 2.3.1 DOM Profiling ... the sizes of solutes and particles of interest is presented Figure 2.1 Overview of pressure-driven membrane processes commonly used in water and wastewater treatment and dimensions of various...
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Effect of thickness on the physical, thermal and chemical properties of ultra thin polymer films
... structure of the repeating unit It increases with decreasing flexibility of the polymer chain Flexibility decreases with increasing aromatic composition of the main chain by the incorporation of bulky ... electronic properties, as well as chemical and processing characteristics of polymer thin films in applications Presence or lack of water in photoresists during the fabrication of intergrated ... films and coatings used in these devices are shrinking in dimensions as well Polyimides are widely used in various industries such as in aerospace applications as wire and cable insulation, and in...
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Biological Alteration of Zinc Complexation Characteristics of Dissolved Organic Matter in Domestic Wastewater Treatment Plant Effluent under River Water Environment
... Biodegradability of zinc binding sites in river water DOM Fig represents the variation of DOC, UV254 and SUVA during the river water incubation for weeks in the preliminary study During the first days of incubation, ... shown in Fig and Table 1, Zn titration data obtained for DOM in the original river water sample seems to fit into two linear portions indicating two classes of binding sites In contrast, DOMs in ... persistent within or less than two weeks Biodegradability of zinc binding sites in DOM of WWTP effluent in river water Fig shows the variation of DOC, UV254 and SUVA during the incubation of DOM in WWTP...
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Influence of Phosphorus Concentration on the Biodegradation of Dissolved Organic Matter in Lake Biwa, Japan
... viewpoint of mass balance, the four possible pathways to increase DOM in the lake are as follows: (1) increase in the DOM loading from the watershed, (2) increase in internal production of DOM, ... Mizushima K and Nomura K (1999) Yearly - 222 - Journal of Water and Environment Technology, Vol 9, No.2, 2011 change in predominant species of phytoplankton and water quality in Lake Biwa, Water Waste, ... northern basin of Lake Biwa Consequently, DOM in 2000s was expected to be 1.6 times higher than that in 1980s Since the ratio of CODMn observed in 2000s to that in 1980s in the northern basin of Lake...
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Tài liệu Risk Characterization, Assessment, and Management of Organic Pollutants in Beneficially Used Residual Products pdf
... analysis of the sample Each cleanup step is intended to eliminate interfering compounds by using physical or chemical properties that differ between interfering compounds and the analyte of interest ... C.D Watts, A.B.A Boxall, R.D Davis, and R Scoffin 1996 Monitoring and prioritisation of organic contaminants in sewage sludges using specific chemical analysis and predictive, non-analytical methods ... P.H Krogh, K.K Brandt, J Sorensen, T Madsen, J Petersen, and C Gron 2003 Recycling of sewage sludge and household compost to arable land: Fate and effects of organic contaminants, and impact on...
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Tài liệu CONSUMER PREFERENCE AND CONSUMPTION OF ORGANIC PRODUCTS IN THE EASTERN CAPE PROVINCE OF SOUTH AFRICA docx
... increases in the future demand of all organic products This augurs well for the growth of the organic industry in the Eastern Cape and in South Africa in general The findings of this study are consistent ... group of people as part of its ways, aids in the cohesion of this group, helps that particular group maintain its identity in the face of others, and therefore creates a feeling of "belonging" ... growing importance of organic products in the food system of the Eastern Cape Province which warrants a systematic investigation into consumer preferences and buying behaviour Factors influencing...
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Effect of chlorine on adsorption ultrafiltration treatment for removing natural organic matter in drink2
... 30 3.2 Interaction of chlorine with dissolved and colloidal NOM in IOP/UF To examine the interaction of chlorine with dissolved NOM and colloidal particles during IOP/UF and UF alone, UV and TOC ... capacity of IOP declined slightly after chlorination of raw water The interaction of chlorine with dissolved NOM in raw water caused a decrease in UV absorbance, while that with particulate matter ... used in this study was made of polyethersulfone and had a molecular weight cutoff of 100,000 and an effective surface area of 28.7 cm2 All the membranes used were initially rinsed, using pure water...
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DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf
... procedures for determination of organic compounds in finished drinking water, source water, or drinking water in any treatment stage The method is applicable to a wide range of organic compounds ... portion of the sample into the solvent reservoir The water sample will drain into the cartridge, and from the exit into the suction flask Maintain the packing material in the cartridge immersed in water ... Ais = integrated abundance of the quantitation ion of the internal standard in the sample Qis = total quantity (in micrograms) of internal standard added to the water sample V = original water...
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ANAEROBIC BIODEGRADATION RATES OF ORGANIC CHEMICALS IN GROUNDWATER: A SUMMARY OF FIELD AND LABORATORY STUDIES pdf
... describe, in mathematical terms, the physical and chemical properties of actual landfill sites These models may be used to develop a probability distribution of concentrations by performing a myriad of ... consumption of oxygen or nitrate that was supported by the electron acceptor demand of materials in the landfill leachate Consequently, the rate of supply of oxygen and nitrate into impacted ground waters ... Paper Industry for Air and Stream Improvement; coordinated and provided initial draft criteria and developed the data through the Syracuse Research Institute DISCLAIMER The work presented in this...
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AEROBIC BIODEGRADATION OF ORGANIC CHEMICALS IN ENVIRONMENTAL MEDIA: A SUMMARY OF FIELD AND LABORATORY STUDIES pot
... soil, sediment, surface water (including freshwater, estuarine, and seawater), and aquifer sediment and groundwater mixtures The information obtained from each of these studies ranged from published ... determine the rate of biodegradation of specific contaminants in groundwater during a field study Mass flux of the studied contaminant through a line/cluster of wells (a transect) is recorded instead ... recalcitrant and 2) have similar properties, such as Henry’ Law constant and s from a minimum of two points along a flow path in order to correct for the loss of the compound of interest due...
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Báo cáo hóa học: " Structure and Photoluminescent Properties of ZnO Encapsulated in Mesoporous Silica SBA-15 Fabricated by Two-Solvent Strategy" doc
... under refluxing condition The procedure of incorporating ZnO into the channels of SBA-15 is as follows [21] A total of g of extracted mesoporous silica SBA-15 was suspended in 20 mL of n-hexane ... (Physical Electronics, Inc.) using an AlKa X-ray source (1486.7 eV) The energy scale was 123 648 internally calibrated by referencing to the binding energy of the C 1s peak of a carbon contaminant ... spacings of wt% ZnO/SBA-15, 15 wt% ZnO/SBA15, and 20 wt% ZnO/SBA-15 are 9.9, 10.0, and 10.3 nm, respectively A clear increase of the d100 interplanar spacing has been observed with increasing...
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USES OF ORGANIC MATTER AND USES OF INORGANIC MATTER potx
... [R]By absorbing and retaining, we mean taking up and holding [S]Nitrates are compounds of nitric acid (which consists of nitrogen and oxygen), and alkaline substances Thus nitrate of potash (saltpetre), ... difference? In what way? This is one of the great offices of plowing and hoeing; the lumps of soil being thereby more broken up and exposed to the action of atmospheric influences, which are often ... has also the power of absorbing mineral matters, which are contained in water If a quantity of salt water be filtered through charcoal, the salt will be retained, and the water will pass through...
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Báo cáo lâm nghiệp: "Chemical composition of the periderm in relation to in situ water absorption rates of oak, beech and spruce fine roots" doc
... the rooting horizon Periods of low rainfall in summer irregularly lead to substantial water shortage in the sandy mineral soil and in the forest floor Gravimetric monitoring of soil water content ... root water uptake is provided by water channels (aquaporins) in the cell-to-cell passage of water flow in roots [7, 45] Opening and closing of the channels could alter Lpr mainly when the water ... periderm, and (ii) suberin and lignin content and, thus, water absorption, are a function of periderm thickness MATERIALS AND METHODS 2.1 Study site Field measurements of root water uptake and sampling...
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Báo cáo khoa học: "Influence of decaying wood on chemical properties of forest floors and surface mineral soils: a pilot study" pptx
... sampling designs and could not determine the influence of DW on tree growth (Lowe and Klinka, 1981; Kabzems and Klinka, 1987; Carter and Klinka, 1990; Klinka and Carter, 1990) Humus form studies in ... differences in morphological and chemical properties of forest floor and mineral soil, and each accumulation of DW was examined for the origin (species) and age of decay The objectives of the present ... material in the spodic horizon can be regarded as an index of the degree, and perhaps the intensity, of Spodosol development (Lowe and Klinka, 1981) Translocation of organic matter and sesquioxides...
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