enrichment of trace amounts of organic contaminants taocs in aqueous solution

... result in higher degradation rates of the organic contaminants On the other hand, addition of large amounts of hydrogen peroxide in the feed solution (continuous-mode operation) or at the beginning ... reaction solution may not be beneficial This is because the concentration of organic contaminants decreases but that of hydrogen peroxide remains the same, resulting in continually increasing [H2 ... characteristics of the feed solution (type and concentration of organics, pH, presence of inorganic ions), the concentration of oxygen in the reaction solution, the magnitude of the intensity and...

Ngày tải lên: 16/03/2014, 00:07

Ngày tải lên: 14/11/2014, 09:31

... investigation in the future 2.5 Compounds and Mixtures Although some sources of contaminants emit solely or predominantly one type of compound into the environment, contaminants usually find their way into ... ecosystems in most parts of the world Research in this area is beginning to gain some importance on the American continent, and has been receiving attention in Europe It is an area that requires investigation ... of “green” chemicals in the future Sources and Input of Organic Pollutants to the Environment 2.1 Diffusive versus Point Sources Sources of contaminants to the environment may be classified into...

Ngày tải lên: 14/02/2014, 09:20

... function of these various wetland communities In turn, an increased understanding of the intrinsic contaminant transformation processes would help supporting the development of organic contaminant ... understanding of the processes governing the removal of organic chemicals is crucial for further system optimization Valuable information regarding the fate of organic contaminants in constructed ... when dealing with aged sediments (Lee et al., 2003) Aging results from chemical reactions sequestering contaminants into organic matter, diffusion into very small pores or inclusion of non-aqueous...

Ngày tải lên: 28/03/2014, 19:20

... fragments of TEs can readily be found in introns in both species Screening for inverted repeats (IRs; using RepeatMasker/ RebBase 8.12) located within a single intron and within 100 bp of each ... dinucleotide repeats [5], again resembling heterochromatin rather than euchromatin Immunofluorescent staining of polytene chromosomes with antibodies directed against HP1 shows an abundance of ... reporter of chromatin packaging, giving a uniform red eye phenotype when inserted into the euchromatic arms but a variegating phenotype when inserted into the pericentric heterochromatin or into...

Ngày tải lên: 14/08/2014, 16:21

... 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...

Ngày tải lên: 10/09/2015, 15:50

... and Ventura F (2001) Monitoring of pesticides in drinking and related waters in NE Spain with a multiresidue SPE-GC-MS method including an estimation of the uncertainty of the analytical results, ... 30 40 50 60 Incubation time (min) Fig - Formation of MPP metabolites by CYP3A4 up to an incubation time of 60 The molarity of MPP (10 M) at the beginning of the reaction was defined as 100% ... participation of human hepatic P450 isomers, flavin-containing monooxygenases ans aldehyde oxidase in the biotransformation of the insecticide fenthion, Toxicol Appl Pharmacol., 233, 343-352 Quintana...

Ngày tải lên: 05/09/2013, 10:15

... aggregates of the mutant proteins using thioflavine T (ThT)-binding analysis The results confirmed the role of the regions in fibril formation of Ab in aqueous solution Results Purification of recombinant ... forms of Ab possess intrinsic neurotoxicity [33,34], indicating the importance of structural analysis in aqueous solutions In APP, Ab1)28 is in the extracellular domain and Ab29)42 is in the ... exchange mapping of Ab using NMR revealed that the middle of Ab is involved in a b structure in the fibrils [30] In contrast, the C-terminal region, including residues 28–42, is important in nucleation...

Ngày tải lên: 07/03/2014, 12:20

... decomposition reactions in aqueous solutions Knowledge of alumina interaction with organicyinorganic molecules in aqueous solution is, therefore crucial in order to understand the mechanism of catalytic ... bonding of Cu(II)glutamate complexes at the g-Al2O3 water interface 3.3.3.3 Dissolution of alumina Dissolution of alumina should also be taken into consideration when discussing the properties of ... dissolution rate of metal oxides strongly depends on the pH of aqueous solution, typically increases at both acidic pH, below the pH of zero point of charge of metal oxide and in the alkaline...

Ngày tải lên: 15/03/2014, 23:22

... to increase in contact of dye molecules decrease of the dye removal percentage It seems to adsorbent particles The effect of mixing speeds that increase in mixing speed leads to increase in on ... water re-use in terms of initial interesting feature of lignocelluloses residues is cost, simplicity of design, use of operation and the physical–chemical properties of the functional insensitivity ... reaches at 400 mgL-1Increasing of by banana peel is shown According to Figure 6, initial dye concentration improved number of the dye adsorption increases with increasing of collisions between...

Ngày tải lên: 06/05/2014, 09:02

... (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,...

Ngày tải lên: 22/06/2014, 01:20

... concentrations Specimens in duplicate were immersed for a period of days in 100 ml, pH aqueous solutions containing various concentrations of the studied inhibitors The mass of the specimens before ... samples were obtained from Medan Province, Indonesia The gambir cubes were grinded into fine powder and sieved with a 50-µm mesh Initially, g of powdered gambir were dissolved in 80°C distilled ... evaluation of nPol can also be performed through electrochemical experiments, which consist of the determination of Tafel curves Tafel plots of mild steel in pH aqueous solutions with and without inhibitors...

Ngày tải lên: 07/08/2014, 14:20

Ngày tải lên: 13/11/2014, 10:10

Ngày tải lên: 13/11/2014, 10:24

... factors, including the amount of immobilized indicators, solution pH, solution ionic strength, initial heavy metal concentrations, the presence of interference ions and co-existed organic contaminants ... world Electroplating industries, metal furnishing industries, burning of leaded gasoline, mining and metallurgic industries, and trash incineration are by far the greatest sources of lead pollutants ... levels of lead exposure may result in toxic biochemical effects in humans such as problems in the synthesis of haemoglobin, malfunction of the kidneys, pains in gastrointestinal tract and joints,...

Ngày tải lên: 09/09/2015, 17:52

... Logarithm of rod density (cm-2) plotted against the total concentration of zinc ions in the precursor solution The inset shows the corresponding initial degree of supersaturation of zinc in the ... the growth of ZnO nanorods and films in aqueous solution using zinc acetate and ammonium hydroxide in detail Regardless of the type of substrate used, the solubility of zinc (SZn), interface properties ... doping in solution phase, it is another objective of this thesis to investigate p-doping of ZnO using group I elements using aqueous chemical growth methods 1.7 Organization of the thesis In...

Ngày tải lên: 14/09/2015, 08:26

... A trace amount of copper is essential for human beings It is often incorporated in ceruloplasmin (a kind of protein in human blood) and plays an important role as an antioxidant for human beings ... one of the common contaminants to water The main source of cadmium pollution to water may often include industrial waste effluents, waste sludge and acid mine drainage (Pandey et al., 2008) In ... (Ni), zinc (Zn) and cadmium (Cd) COPPER Copper is widely used in the industry in applications including wiring, 10 plumbing, pesticide manufacturing and domestic metal Therefore, copper contamination...

Ngày tải lên: 14/09/2015, 08:48

... cell wall of marine algae contains a high proportion of alginate constituting 14–40% of the dry 12 weight of the biomass Alginic acid is a polymer composed of un-branched chains of 1, 4linked h-d-mannuronic ... for the adsorption of Cr ions by only analyzing Cr(VI) concentration in aqueous solutions resulting in incorrect elucidation of Cr biosorption Cr(VI) was removed from aqueous solution systems by ... number of toxic heavy metals including chromium, whose increasing levels in the environment are of considerable concern With the rapid development of various industries, wastes containing metals...

Ngày tải lên: 15/09/2015, 22:51

... 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 ... 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 water containing NaOH (Wako ... 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...

Ngày tải lên: 29/04/2016, 15:22