acid dissociation constants of organic acids in aqueous solution

The development and study of titanium dioxide based buoyant composite photocatalyts for improved applications in photocatalytic degradation of organic pollutants in aqueous solutions

Ngày tải lên : 10/09/2015, 15:50

... most of the surfaces being still exposed, meaning that increasing the deposited Pt amount on TiO2 may not necessarily result in the increase of the photoactivity of TiO2 The deposition of silver ... Huang (1991) examined the photocatalytic oxidation of sulfur-containing compounds using CdS and found that the presence of sulfur-containing organics reduced the photo-corrosion of CdS Yan et al ... DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING NATIONAL UNIVERSITY OF SINGAPORE 2012 Acknowledgement First of all, I would like to thank my supervisor Prof Bai...

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Chemical of alumina reactions in aqueous solution and its application in water treatment

Ngày tải lên : 15/03/2014, 23:22

... water interface 3.3.3.3 Dissolution of alumina Dissolution of alumina should also be taken into consideration when discussing the properties of alumina in aqueous solution Dissolution of alumina ... charge of alumina changes from positive to negative with increasing pH The surface charge density of alumina particles and the dissociation of acidic groups of humic acid are enhanced by increasing ... assumption that anions of the organic acids replace the surface hydroxo groups of alumina, was used by Kummert and Stumm w103x in order to explain the specific interaction of organic acids with the hydrous...

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Báo cáo hóa học: " The Fabrication of Nano-Particles in Aqueous Solution From Oxyﬂuoride Glass Ceramics by Thermal Induction and Corrosion Treatment" pdf

Ngày tải lên : 22/06/2014, 01:20

... (DTA) Using DTA equipment (TA-Inst 2100), samples were held in a Pt crucible and analysed against a calcined Al2O3 reference at a heating rate of 20 °C min-1.The nano-particles in aqueous solution ... nano-particles in aqueous solution have the same luminescent properties as those existing in glass host From a practical point of view, it is possible for the nano-particles in aqueous solution from ... bio-distribution of the drug The nanoparticles in aqueous solution from the GC-host also apply in non-invasive imaging by detecting the luminescence of nano-particles inside biological systems, like cells,...

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the environmental photochemistry of pharmaceutical compounds in aqueous solution and on a clay surface

Ngày tải lên : 13/11/2014, 10:10

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Measurement of OH Radicals in Aqueous Solution Produced by Atmosphericpressure LF Plasma Jet

Ngày tải lên : 29/04/2016, 15:22

... fluorescence intensity of HTA is independent of pH in the range of 6-11 Since TA (Aldrich) does not dissolve in acidic/neutral liquid, aqueous solution of TA was prepared by dissolving TA in the distilled ... density in the solution as a function of treatment time as shown in Fig.7 The concentration of OH radicals in the cuvette almost linearly increases with increasing the time Besides trapping of OH ... reactions as a function of the concentration of LAS aqueous solution Regardless of the initial concentration of LAS in the solution, the degradation rate is about 60 % According to [14], it is considered...

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Microbial Production of Amino Acids in Japan

Ngày tải lên : 26/10/2013, 02:20

... contain lower amounts of lysine, which is one of Microbial Production of Amino Acids in Japan 77 the essential amino acids for those livestocks The estimated amount of l-lysine produced in the ... l-Glutamine l-Histidine l-Isoleucine l-Leucine l-Lysine l-Methionine dl-Methionine l-Phenylalanine l-Proline l-Serine l-Threonine l-Tryptophan l-Tyronsine l-Valine l-Dihydroxyphenylalanine d-Phenylglycine ... Amino Acids in Japan Table Amino acid production in Japan and the world in 1996 Amino acid Method Japan Glycine l-Alanine dl-Alanine l-Aspertate l-Aspergine l-Arginine and analogs l-Cysteine and...

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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

... the incorporation of multiple conservative assumptions in deterministic risk assessment It is not intended to judge the validity of the assumptions In 1998, the State of Wisconsin began developing ... typically in the range of one in ten thousand to one in one million additional cases A case study from the State of Wisconsin illustrates the effect of multiple conservative assumptions in a deterministic ... 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 The analytical...

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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

... 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 ... agro-business management for more innovative packaging and displays to enhance the appeal 25 of organic products It is also important that government finds ways of integrating organic foods issues into...

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Uptake of organic chemicals in plants Human exposure assessment ppt

Ngày tải lên : 05/03/2014, 20:20

... applied in numerous studies It is well suited for determining distribution constants between environmental media and water, and for the determination of protein-binding affinities (Heringa and ... diffuse into the sampling phase depending on the type of fiber used After sampling, the fiber is injected into the inlet of a gas chromatograph for thermal desorption and determination of analytes ... SPARC.8,9 Determining SPME Sampling Kinetics The SPME sampling kinetics were studied for a number of sample types in order to (1) determine the sampling time needed to ensure equilibrium sampling, (2)...

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Báo cáo khóa học: O-acetylation and de-O-acetylation of sialic acids in human colorectal carcinoma docx

Ngày tải lên : 07/03/2014, 14:20

... The resulting residue was resuspended in ice-cold water and sialic acids puriﬁed as previously described [24] The incorporation of [3H]acetate into the glycerol side chain of sialic acids was ... Sialic acid in colorectal carcinoma % Sialic acids in resection margins Table Fluorometric-HPLC and GC-MS analysis of glycoconjugate-bound and free sialic acids isolated from the mucosa of matched ... sialic acid seen in cancer tissue compared to that in the corresponding resection margin was also observed at all stages of colorectal carcinoma (Table 2) Interestingly, the level of Neu5,9Ac2 in...

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Remediation of Organic Chemicals in the Vadose Zone docx

Ngày tải lên : 14/03/2014, 19:20

... (assuming other factors are independent of depth) Effectiveness is improved by the presence of a confining layer, such as a bed of fine-grained sediment, above the well screen The ROI of the well increases, ... of them are intended to increase the partitioning of organic chemicals into vapor phases where they can be recovered by SVE processes In addition, one of the heating methods, conductive heating, ... solubility in water Mixtures of dissolved contaminants increase, slightly, the volatility of most of the individual constituents, as their solubilities often decrease in the presence of other compounds...

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Supply Chain of Organic Products in Bulgaria ppt

Ngày tải lên : 14/03/2014, 20:20

... period Organic farming processing in Bulgaria currently (2007) includes: Drying of herbs, spices, seeds Processing of organic products, including cultivated herbs and spices, packing of fruit, ... unstructured supply chain of the organic products Indepth interviews with organic supply chain participants reveals the main shortcomings of the existing supply chains in the country and the ... 4.Improving the supply chain for organic products in Bulgaria In the survey several questions were asked concerning opinions of the experts for improving the supply chain for the organic products in...

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Cadmium mobilisation and plant availability the impact of organic acids

Ngày tải lên : 15/03/2014, 23:22

... reduces the extent of Cd organic acid complexation, resulting in a lower plant availability There was an increasing trend in SPT values of Cd with increasing concentration of organic acids provides ... uptake of Cd from the Cd treatments with increasing concentration of organic acids seems to be the resultant of the interactions of Cd with organic ligands resulting in the formation of mobile organically ... applying to the surface of growing media of 60-dayold plants a single pulse addition of a solution (200 mL) containing radiolabelled Cd (44 µm) with varying amount of different organic acids: ...

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Báo cáo khóa học: Vertical-scanning mutagenesis of amino acids in a model N-myristoylation motif reveals the major amino-terminal sequence requirements for protein N-myristoylation ppt

Ngày tải lên : 16/03/2014, 16:20

... mutant in which amino acids following the initiating Met were changed to Ala, was used as the starting sequence to evaluate the roles of the amino acids at distinct positions in protein N-myristoylation ... Amino acids at positions 3, and are in bold type Protein Ca2+ binding/EF hand proteins Aplycalcin Hippocalcin Neurocalcin Rem-1 Visinin-like protein ADP-ribosylation factor Arf-6 Fig The combination ... metabolic labeling of model substrate proteins in an in vitro translation system In this case, to avoid the effects of amino acids at other positions in the N-terminal region on protein N-myristoylation,...

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Báo cáo khoa học: Identiﬁcation of amino acids in antiplasmin involved in its noncovalent ‘lysine-binding-site’-dependent interaction with plasmin pptx

Ngày tải lên : 17/03/2014, 03:20

... lysine-binding-site-dependent interaction between plasmin and antiplasmin in detail by constructing seven single-site mutants of antiplasmin Fig Computer model of the C-terminal 40 amino acids in ... lysine-binding-site-mediated interaction between plasmin and antiplasmin Molecular modelling of the C-terminal portion of antiplasmin The amino -acid sequence of the C-terminal 40 residues in antiplasmin ... of the plasmin activity was inhibited) Computer model of the C-terminal 40 amino acids in antiplasmin A computer model of the C-terminal 40 amino acids in antiplasmin [11] was constructed by CS...

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DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY pdf

Ngày tải lên : 22/03/2014, 14:20

... 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 ... tune and initial calibration at the beginning of each 12-hour work shift during which analyses are performed using the following procedure 10.3.1 Inject a µL aliquot of the ng/µL solution of DFTPP, ... concentration of analyte or surrogate in µg/L in the water sample Ax = integrated abundance of the quantitation ion of the analyte in the sample Ais = integrated abundance of the quantitation ion of the internal...

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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

... of the combined process of the feeding rate, which is based on the bioenergetics of organism weight W (kg) and temperature T (8C), and of the diffusion rate of the chemical across the intestinal ... Potential of Organic Chemicals in Aquatic Food Webs derivation of a trophic dilution factor for a group of PAHs In this example, the model is fitted to available BCF and BAF data, resulting in a kM of ... Weight of organism Lipid content of organism Lipid content of lowest trophic level organisms Concentration of particulate organic carbon Concentration of dissolved organic carbon Fraction of freely...

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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

... Rate Constants ii ACKNOWLEDGMENTS A number of individuals have been involved with the project Dr Zubair A Saleem of the U.S EPA, Office of Solid Waste, Washington, ... studies and incorporate the results in modeling Therefore, EPA convened a workshop in Atlanta, Georgia, on anaerobic biodegradation of organic chemicals in 1997 Representatives from academia, industry ... the distribution of rate constants The individual rates are also reported in parentheses following the average Information from the tables in Appendix F for each compound is used in the subsurface...

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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

... 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 ... reached as a final timepoint, an earlier time was chosen for the kinetics calculation, if possible; the use of zero as a denominator in the first-order rate equation would result in an “infinite” value ... leveled off at that point for the remainder of the experiment, the final concentration and time were chosen at the point where the concentration leveled off In column studies, the time field in the...

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