ion exchange and adsorption of inorganic contaminants

Ngày tải lên: 14/11/2014, 09:31

... 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 necessary to produce a fertile condition of soil, ... larger proportion of the soil, namely the clay, sand, and limy portions, are useful for purposes which have been named in the first part of this section, while the clay has an additional effect ... particular condition of inorganic matter is requisite for fertility? What is the fixed rule with regard to this? What is the condition of the alkalies in most of their combinations? Of the acids?...

Ngày tải lên: 29/06/2014, 15:20

... The increases of root growth, root length and the higher number of ramifications may allow the exploitation of a greater volume of soil and thus, nutrient extraction in soil water and layers not ... INTRODUCTION of To understand and The objective of this study was to determine the effects of an increase in CO con2 centration on the carbon gain of Quercus suber seedlings We examined the effects of ... enhancement i) on leaf gas exchange under well-watered conditions and moderate drought and ii) on biomass production and predict the impact of increasing CO upon natural vegetation, it is necessary...

Ngày tải lên: 08/08/2014, 18:21

... characterization and adsorption study Journal of Physical Science, Vol 19(1), 63–78, 2008 2.3.4 67 Preliminary biosorption study of Cd(II) ion Adsorption of Cd(II) ion from a single metal aqueous solution ... 0.05–0.5 g and the pH of the solution was kept constant at 6.0 RESULTS AND DISCUSSION 3.1 Isolation and Characterization of Chitin Isolation of chitin from prawn seawater shells consisting of depigmented, ... Effect of Adsorbent Mass on the Biosorption of Cd(II) Ion The effect of adsorbent mass on the biosorption of Cd(II) ion was examined by conducting adsorption experiments using fixed concentration of...

Ngày tải lên: 07/08/2014, 14:20

Ngày tải lên: 13/03/2015, 10:12

... Exchange and Promissory Notes (Geneva, 1930) The League of Nations Articles I - XI [Omitted] TITLE I - Bills of Exchange CHAPTER I - Issue and Form of a Bill of Exchange Article A bill of exchange ... Limitation of actions (Articles 70 and 71); 311 Holidays, computation of limits of time and prohibition 312 of days of grace (Articles 72, 73 and 74) The following provisions are also applicable to ... the original is null and void 269 CHAPTER X - Alterations Article 69 In case of alteration of the text of a bill of exchange, parties who have signed subsequent to the alteration are bound according...

Ngày tải lên: 22/10/2013, 10:15

... Configuration and Administration of Microsoft Exchange This document describes how to more securely install, configure, and administer the Microsoft Exchange Server and associated clients The focus of ... encryption and decryption of messages as well as the application and verification of digital signatures The client also stores the user’s private key in an encrypted manner The Exchange client and ... proceeding II Trademark Information Windows NT, Microsoft Exchange, and Microsoft Outlook are either registered trademarks or trademarks of Microsoft Corporation in the U.S.A and other countries All...

Ngày tải lên: 22/10/2013, 16:15

... explanation for the 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 ... concentrations of calcium (Ca) and other cations, trace metals, boron (B), and silica (SiO2) The reported concentrations for major cations and anions carry an uncertainty of ±3% Precision values ... Na and Cl, and has relatively high concentrations of Ca, Mg (Fig 3), Sr, Ba and NH4, but very low amounts of SO4, HCO3 (Fig 4) and H2S With the exception of Fe, the concentrations of trace metals...

Ngày tải lên: 14/02/2014, 03:20

... full-length v-KIND; DKIND1, deletion of KIND1; DKIND2, deletion of KIND2; DKIND1 + 2, deletion of both KIND1 and KIND2; DRasN, deletion of RasN; DGEF, deletion of RasGEF; KIND1, KIND1 domain; ... 600–767) region, we next generated a series of GST-fused deletions of the CD2-1 region (Fig 3E) and examined the interactions between bacterially expressed proteins of these subregions (Fig S1C) and ... domains of Spir-2 and PTPN13 were generated by RT-PCR and inserted into pEGFP-C1 and pGEX-4T-2 The N- and C-terminal regions of the v-KIND KIND2 and the MAP2 CD were generated by PCR and cloned...

Ngày tải lên: 14/02/2014, 19:20

... industry; of industry and implementation information, providing of those technologies in ACCREDITATION The Institute of Paper Science and Technology is accredited by the Commission Colleges and Schools ... Master of Science and Doctor of Philosophy NOTICE on Colleges degrees of the Southern Association of AND DISCLAIMER The Institute of Paper Science and Technology (IPST) has provided a high standard ... INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY PURPOSE AND MISSIONS The Institute of Paper Science and Technology is an independent graduate school, research organization, and information center...

Ngày tải lên: 09/03/2014, 01:20

... Percentage concentration of ethanol in MnSO4 solution and EP2: Percentage concentration of ethanol in KMnO4 solution Table showed strong effect of ethanol concentration in reagents’ solution on MnO2 nanoparticles ... molecules and ions association and crystals growing Nanodimensional MnO2 adsorbent Figure and described the surface of denaturated laterite before and after coating of MnO2 particles Fig SEM image of ... AA-6800, Shimadzu) Results and discussion Nanodimensional MnO2 formation Table The effect of ethanol concentration in reagent solutions on nanodimensional MnO2 formation (%) EP1 10 15 25 50 75...

Ngày tải lên: 14/03/2014, 10:20

... also accelerated the adsorption kinetics The adsorption edges shifted to lower pH substantially in the presence of phosphate, indicative of enhanced Cd adsorption The adsorption of Cd did not reach ... Gerth, J., Brummer, G.W., 1989 Reaction kinetics of the adsorption and desorption of nickel, zinc, and cadmium by goethite II Modeling the extent and rate of reaction J Soil Sci 40, 437–456 Bibak, ... slope of adsorption curves, the adsorption edge shifted distinctly to lower pH, indicating the substantial enhancement of Cd adsorption The pH50 (the pH value at which 50% of heavy metal ions...

Ngày tải lên: 15/03/2014, 23:08

... imperfections in the crystal lattice and the different nature and position of charges on the surface There are two q1 = Fig Adsorption of As(III) on Wyoming bentonite as a function of pH and ionic ... number and position of potential planes, and the position of the adsorbed species The two main reactions occurring are ion exchange, which is mainly of electrostatic nature, and surface complexation, ... precipitation, and fixation [4] Adsorption is a two-dimensional accumulation of matter at the solid/water interface and is understood primarily in terms of intermolecular interactions between solute and...

Ngày tải lên: 15/03/2014, 23:09

... isotherms, and Pb adsorption was almost an order of magnitude greater than that of Cd (Figs and 3) Extraction with NH2OHÁHCl and Na2S2O4 signi®cantly reduced both Pb and Cd adsorption, and adsorption ... measuring Pb and Cd adsorption from solutions with de®ned metal speciation and initial Pb and Cd concentrations ranging from 0.2 to 2.0 mM The equilibration solutions were prepared by dilution of 1000 ... speciation calculated by MINEQL for a total Pb/Cd concentration of 1.0 mM b Measurement of Pb and Cd adsorption to natural bio®lms Pb and Cd adsorption isotherms were obtained for extracted and...

Ngày tải lên: 15/03/2014, 23:12

... concentration of organics, pH, presence of inorganic ions), the concentration of oxygen in the reaction solution, the magnitude of the intensity and wavelength of the UV light, the desirable extent of ... peroxide and its inhibition effect at higher concentrations A summary of the reaction rate constants of certain of these reactions is provided in Table Redox potentials of many of these reactions ... oxidation (enhanced generation of hydroxyl radicals); and (b) direct formation of additional hydroxyl radicals due to H2 O2 reduction by the conduction band electron In turn, higher rates of hydroxyl...

Ngày tải lên: 16/03/2014, 00:07

... Fig Effect of SO2À at various concentrations on the adsorption of As(III), As(V), Se(IV), and Se(VI) 3.4 Effect of competitive anions on As and Se adsorption Arsenite and Se(VI) adsorption decreased ... the adsorption kinetics of As(III) on several Spanish soils 3.3 Effect of pH on As and Se adsorption The adsorption of As(III), As(V), Se(IV), and Se(VI) on the tropical soil as a function of pH ... the adsorption of As and Se 3.5 Adsorption isotherm Various adsorption isotherms were used to describe the thermodynamics of As(III), As(V), Se(IV), and Se(VI) adsorption In this study, As(V) and...

Ngày tải lên: 16/03/2014, 00:25

... precipitation of aqueous solutions) these contributions have led to a greater understanding of the method of nanoparticle production using microemulsion media V CONTROL OF POLYMER ADSORPTION AT ... (EOR) processes and preparation of nanoparticles of advanced materials, (4) adsorption of polymers at solidliquid interfaces and selective occulation, and (5) the mechanical strength of surfactant ... control the adsorption, conformation, and role of surface molecular architecture in selective polymer adsorption For a particular polymer functionality, the adsorption depends on the nature and energetics...

Ngày tải lên: 16/03/2014, 11:43

... nitrogen deposition on land and coastal environments: a review of methods and data, Atmos Environ., 37, 2173–2191, 2003 Fan, H B and Hong, W.: Estimation of dry deposition and canopy exchange in ... Version Fig Concentrations of DON in precipitation (a), throughfall (b) and soil solution (c) from Figure Concentrations of DON in precipitation concentration and soil solution (c) from three subtropical ... the concentrations and fluxes of dissolved inorganic (DIN) and organic N (DON) in precipitation, throughfall, surface runoff and soil solution for three subtropical forests in a region of South China...

Ngày tải lên: 23/03/2014, 00:20

... manures ii) The determination of the manures effects on organic matter content and adsorption complex of the soil under cassava cultivation 191 MATERIALS AND METHODS Site description The study was carried ... saturation content (%) cation exchange capacity (me:100 g) Figure Responses in soil sum of the exchangeable bases cations at - 22 and 22 - 55 cm soil layers in the sandy soil under cassava cultivation ... manures which has three roles of organic matter sources, of protection of the soil against erosion and of increase in the activity of earthworms which reduce water runoff (Hole et al., 2005; Parfitt...

Ngày tải lên: 23/03/2014, 21:20

... interactions with Na+ or K+ ions A number of isoforms of the a and b subunits has been isolated from various tissues of numerous species, and it has been repeatedly demonstrated that the function of ... type I membrane peptides and also offers the possibility of addressing physiologically relevant questions in connection with the regulation of the expression of this type of protein THE CATALYTIC ... Glu779 is a part of the overall structure that participates in the formation of an ion coordination complex involved in cation selectivity and activation of the sodium pump Of all acidic amino...

Ngày tải lên: 24/03/2014, 00:21