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  Subjects -> ENGINEERING (Total: 2054 journals)
    - CHEMICAL ENGINEERING (169 journals)
    - CIVIL ENGINEERING (160 journals)
    - ELECTRICAL ENGINEERING (87 journals)
    - ENGINEERING (1142 journals)
    - ENGINEERING MECHANICS AND MATERIALS (318 journals)
    - HYDRAULIC ENGINEERING (50 journals)
    - INDUSTRIAL ENGINEERING (52 journals)
    - MECHANICAL ENGINEERING (76 journals)

CHEMICAL ENGINEERING (169 journals)                  1 2     

ACS Combinatorial Science     Full-text available via subscription   (Followers: 9)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 4)
Acta Polymerica     Hybrid Journal   (Followers: 6)
Additives for Polymers     Full-text available via subscription   (Followers: 21)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 5)
Advanced Chemical Engineering Research     Open Access   (Followers: 8)
Advanced Powder Technology     Hybrid Journal   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 16)
Advances in Chemical Engineering and Science     Open Access   (Followers: 22)
Advances in Polymer Technology     Hybrid Journal   (Followers: 11)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 4)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 10)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 4)
Applied Petrochemical Research     Open Access   (Followers: 3)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 6)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 9)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 5)
BMC Chemical Biology     Open Access   (Followers: 4)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Catalysts     Open Access   (Followers: 7)
Chemical and Engineering News     Free   (Followers: 4)
Chemical and Materials Engineering     Open Access  
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 8)
Chemical and Process Engineering     Open Access   (Followers: 3)
Chemical and Process Engineering Research     Open Access   (Followers: 5)
Chemical Communications     Full-text available via subscription   (Followers: 30)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 24)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 10)
Chemical Engineering and Science     Open Access   (Followers: 2)
Chemical Engineering Communications     Hybrid Journal   (Followers: 10)
Chemical Engineering Journal     Hybrid Journal   (Followers: 20)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 16)
Chemical Engineering Science     Hybrid Journal   (Followers: 12)
Chemical Geology     Hybrid Journal   (Followers: 9)
Chemical Papers     Hybrid Journal   (Followers: 3)
Chemical Product and Process Modeling     Full-text available via subscription   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 336)
Chemical Society Reviews     Full-text available via subscription   (Followers: 31)
Chemical Technology     Open Access   (Followers: 5)
ChemInform     Hybrid Journal   (Followers: 3)
Chemistry & Industry     Hybrid Journal   (Followers: 2)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry of Materials     Full-text available via subscription   (Followers: 235)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 6)
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 1)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 3)
Coke and Chemistry     Hybrid Journal  
Coloration Technology     Hybrid Journal   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 8)
Computer Aided Chemical Engineering     Full-text available via subscription   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 7)
CORROSION     Full-text available via subscription  
Corrosion Reviews     Full-text available via subscription   (Followers: 4)
Crystal Research and Technology     Hybrid Journal   (Followers: 2)
Current Opinion in Chemical Engineering     Open Access   (Followers: 3)
Education for Chemical Engineers     Hybrid Journal   (Followers: 4)
Ekologia : The Journal of Institute of Landscape Ecology of Slovak Academy of Sciences     Open Access  
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription  
European Polymer Journal     Hybrid Journal   (Followers: 41)
Fibers and Polymers     Full-text available via subscription   (Followers: 3)
Fluorescent Materials     Open Access  
Focusing on Modern Food Industry     Open Access   (Followers: 3)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 1)
Geochemistry International     Hybrid Journal  
Handbook of Powder Technology     Full-text available via subscription   (Followers: 2)
Heat Exchangers     Open Access   (Followers: 1)
High Performance Polymers     Hybrid Journal  
Indian Chemical Engineer     Hybrid Journal   (Followers: 3)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 12)
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 9)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 19)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 4)
Info Chimie Magazine     Full-text available via subscription   (Followers: 3)
International Journal of Chemical and Petroleum Sciences     Open Access   (Followers: 2)
International Journal of Chemical Engineering     Open Access   (Followers: 6)
International Journal of Chemical Reactor Engineering     Full-text available via subscription   (Followers: 3)
International Journal of Chemical Technology     Open Access   (Followers: 4)
International Journal of Chemoinformatics and Chemical Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Food Science     Open Access   (Followers: 2)
International Journal of Industrial Chemistry     Open Access  
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 3)
International Journal of Science and Engineering     Open Access   (Followers: 7)
International Journal of Waste Resources     Open Access   (Followers: 5)
ISRN Chemical Engineering     Open Access   (Followers: 4)
ISRN Polymer Science     Open Access   (Followers: 11)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 4)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 12)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 217)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 8)
Journal of Chemical & Engineering Data     Full-text available via subscription   (Followers: 11)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 2)
Journal of Chemical Engineering     Open Access   (Followers: 4)
Journal of Chemical Engineering and Materials Science     Open Access  
Journal of Chemical Science and Technology     Open Access   (Followers: 3)
Journal of Chemical Sciences     Partially Free   (Followers: 15)

        1 2     

Journal Cover Geochemistry International     [SJR: 0.401]   [H-I: 13]
   Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1556-1968 - ISSN (Online) 0016-7029
   Published by Springer-Verlag Homepage  [2210 journals]
  • Geochemistry of seismoactive regional faults: Baikal Rift zone, east
           Siberia
    • Abstract: Abstract The contents of mobile ore elements Pb, Zn, Cu, Mo, Ag, Sn, As, Tl, Hg, as well as B and Fe group elements are determined and their distribution is studied in a loose cover and waters at the surface of the largest regional faults of the Baikal Rift Zone: Tunka, Barguzin, marginal suture of the Siberian Platform, and in the near-fault Kucheger thermal field. The amounts of O2, CO2, CO, CH4, H2S, SO2, Rn, and Rn-related ionization of ground air are measured in soil gases at the faults. Geochemical associations typical of faults were identified. The geochemical fluxes of their major elements and natural toxic elements As, Tl, and Hg on the subsurface geochemical barriers are calculated. Migration of ore elements is a function of near-fault heat flows, the surface values of which were estimated from distant Earth’s sounding data with establishing the dominant of convective component.
      PubDate: 2015-01-01
       
  • Microrhythmic distribution of Co, Mn, Ni, and La contents in cobalt-rich
           ferromanganese crusts from the Magellan Seamounts
    • Abstract: Abstract Variations in the contents of Fe and Mn and a number of trace elements (Co, Ni, Cu, Zn, As, Rb, Sr, Y, Zr, Pb, Th, U, Te, Ba, La, Ce, Nb, and Mo) were simultaneously measured in microlayers in samples of cobalt-rich ferromanganese crusts from the surface of three guyots of the Magellan Seamounts by means of synchrotron micro-XRF analysis on a VEPP-3 accelerator facility at the Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences. Micro-scale periodic variations were detected in the contents of most trace elements. The high and low contents of Co, Ni, and Mo in the crusts display also a larger scale periodicity. Based on the previous dating of ferromanganese crusts from the Magellan Seamounts and recent estimates of crust growth rates, we determined the geochronological position of maxima in the stratigraphic section and time intervals between trace element extrema. It was shown that micro-scale periodic variations in trace element contents in all the samples analyzed by us are similar despite the significant differences in the absolute contents of trace elements. The similar trace element variations suggest that this periodicity could be related to global changes in climatic conditions in the ocean. The analysis of correlations between trace elements and manganese, the major component of the crust, revealed the persistency of geochemical associations for all the age stages of crust formation. This can be considered as evidence for the hydrogenous origin of ferromanganese materials on the seamounts. Some specific variations in trace element contents observed in layer III were attributed to the contribution of volcanic processes during the respective stage of development.
      PubDate: 2015-01-01
       
  • Material transfer through the interface between peraluminous metapelite
           and gedrite-bearing gneiss at high temperatures and moderate pressures
    • Abstract: Abstract Relations between gedrite-bearing gneisses and aluminous metapelites were studied in amphibolite- and granulite-facies rocks in the Sharyzhalgai Complex, Eastern Sayan. The rocks show reaction relations and provide evidence of simultaneous diffusion of components through the interface between these chemically unequilibrated rocks, with the displacement of the boundary between them. In the vicinity of the gedrite-bearing gneiss, garnet and sillimanite of the aluminous metapelite are replaced (up to complete disappearance) by cordierite. The XMg of the rock and its minerals simultaneously increase. The diffusion coefficients of major oxides were evaluated as follows (cm2/s): TiO2 = 6.98 × 10−15, Al2O3 = 1.45 × 10−14, FeO = 9.70 × 10−15, MgO = 3.27 × 10−14. The thicknesses 2h (cm) of the zones of diffusion-controlled transfer of various components were estimated as follows: TiO2 = 6.6, FeO = 7.8, K2O = 8.5, Al2O3 = 9.5, Fe2O3 = 14.1, MgO = 14.3. The average calculated velocity of the interface is V = 4.2 × 10−6 cm/year. The relative mobility of major oxides was determined as follows: MgO > Fe2O3 > Al2O3 > K2O > FeO > TiO2.
      PubDate: 2015-01-01
       
  • Isotope-geochemical data on ferruginous mineral waters: Conditions of
           formation of “Marcial Waters” resort, Karelia
    • PubDate: 2015-01-01
       
  • Compositional variability of pyrope in kimberlites at high pressures and
           temperatures
    • PubDate: 2015-01-01
       
  • The possibility of phosphatization of silicates in the supergene zone
    • PubDate: 2015-01-01
       
  • Fractionation of zirconium in pyroxenes of alkaline magmas
    • Abstract: Abstract Pyroxenes of the Lovozero Massif (Kola Peninsula) intensely accumulate zirconium. The Zr content in the pyroxenes varies from 0.01 to 2.3%. In the pyroxenes from the Eudialyte Complex, Zr content increases with increasing the stratigraphic height in the sequence of the Lovozero intrusion. In contrast, Zr concentration in pyroxenes from the Differentiated Complex show very uneven distribution. This is related to the crystallization of pyroxenes at different stages of melt evolution and to the variations in their alkalinity. The zirconium distribution in pyroxenes of the Lovozero Massif is determined by the fractional crystallization differentiation. The partition coefficient of zirconium between pyroxene and ultraalkaline magmatic system was determined for the first time on the basis of alkaline pyroxene—melt equilibrium in hypabyssal porphyritic lujavrites. The model of generation of zirconium (eudialyte) ores in the Lovozero Massif was developed using this value and equations of equilibrium and fractional crystallization.
      PubDate: 2015-01-01
       
  • Phase relations in the system (Mg,Ca) 3 Al 2 Si 3 O 12 -Na 2 MgSi 5 O 12
           at 7.0 and 8.5 GPa and 1400–1900°C
    • Abstract: Abstract The CaO-MgO-Al2O3-SiO2-Na2O multicomponent system was experimentally studied at 7.0 and 8.5 GPa using an anvil-with-hole toroidal high-pressure apparatus to examine two binary joins: pyropegrossular and grossular-Na-majorite. These and literature data were employed to simulate the liquidus surface of the pyrope-grossular-Na-majorite system. The liquidus surface of garnet of predominantly pyrope composition is dominant in the diagram, and the garnet contains much of the Na2MgSi5O12 end member. Melting was observed in this region at temperatures above 1900°C, and the solidus of the system occurs at temperatures below 1550°C. The pyrope-grossular system shows a miscibility gap at 50–65 mol % of the pyrope component and two series of garnet solid solutions. The dominant phase at grossular and Na-majorite mixing is pyroxene, and garnet crystallizes within a fairly narrow field in the grossular-rich region. All garnets synthesized in the systems have elevated Si and Na concentrations and belong to the majorite series, for which a uniform mechanism of isomorphism (Mg, Ca) + Al = Si + Na was proved.
      PubDate: 2015-01-01
       
  • Fractal polymer globules: A new insight on prebiological evolution
    • Abstract: Abstract One of the most important problems of the origin of life, namely, the problem of the evolutionary primary carriers of selective functions in evolution that provided the required accuracy in the assembly of complex molecular structures at the prebiological stages of evolution, is discussed in this paper. In contrast to the widely abundant approaches to this problem that consider only RNA- and/or protein-like structures, we suggest that so-called fractal (crumpled) polymer globules could be the primary carriers of selective functions. The unusual structure and dynamics of fractal globules are described in this paper. It is demonstrated that although a fractal globule does not have the elements of the secondary structure of RNA and proteins, its dynamic properties are similar to those of biological molecular machines.
      PubDate: 2014-12-01
       
  • Early stage of the evolution of the universe: Molecular medium and the
           emergence of properties of functioning of living systems
    • Abstract: Abstract It was shown that the modern theory of molecular processes provides a natural explanation for the most important (formulated in this paper) observed features of biosphere formation at the earliest stages of the appearance of the molecular world. An increase in the complexity of molecular objects was accompanied by the appearance of some essential properties that would subsequently be dominant in much more sophisticated structures: viruses, cells, bacteria, etc. The determinism of biosphere development controlled by the genetic code and the diversity of objects composing the biosphere occur in mutually complementary (in the sense of Bohr) relations. The elimination of any item of this pair will inevitably result in the disappearance of the biosphere and the life phenomenon itself. It was established how molecules can acquire and process in a unique way fuzzy information and, then, provide its directional transfer into the intramolecular space over considerable distances. A possible basis for the construction of molecular logical units and transducers was discussed. We considered also the problem of complementarity, training, and pattern comparison in the molecular world. It was shown that periodic changes in the parameters of external impacts result in the appearance of a rhythm (biorhythm) common for the whole molecular ensemble and can stimulate biochemical processes and, moreover, affect the direction of evolution in a biomolecular system. These results provided a basis for the further stages of reserach, including a transition from qualitative inferences to quantitative estimates.
      PubDate: 2014-12-01
       
  • Highly diluted aqueous solutions: Formation of nano-sized molecular
           assemblies (nanoassociates)
    • Abstract: Abstract Based on experimental data obtained using a combination of physicochemical techniques (dynamic light scattering, microelectrophoresis, conductivity, surface tension, pH, dielectric constant, polarimetric measurements, atomic force microscopy, and UV and EPR spectroscopy) a previously unknown fundamental phenomenon was discovered: the formation of nanometer-sized molecular assemblies (nanoassociates) in low-concentration aqueous solution, which were prepared by serial dilution. The formation and rearrangement of nanoassociates in solutions of different concentrations can be considered as a major factor controlling the physicochemical and, probably, specific biological properties of diluted aqueous solutions. The formation of nanoassociates is triggered by the solute under certain conditions, the most important of which are the specific solute structure, the presence of external physical fields (geomagnetic and low-frequency electromagnetic), and the solution preparation procedure.
      PubDate: 2014-12-01
       
  • Photoinduced processes of hydrogen peroxide formation and decomposition
           and their role in photosynthesis and biosphere origin
    • Abstract: Abstract Processes of mutual photocatalytic transformation of O2 and H2O2 in aqueous suspensions of chlorophyll and phthalocyanine immobilized on silica gel were investigated with application to the problem of the origin and evolution of the biosphere. It was demonstrated that chlorophyll affects the processes of H2O2 generation in water saturated in air oxygen and H2O2 decomposition in water upon illumination. The efficiency of these photocatalytic processes was shown to depend on pH of the medium and the amount of the pigment coating the substrate surface. The formation of organic products was detected at the irradiation of the suspensions of chlorophyll (phthalocyanine)/silica gel/water containing H2O2 and an inorganic carbon source.
      PubDate: 2014-12-01
       
  • Prebiotic synthesis and selection of macromolecules: Thermal cycling as a
           condition for synthesis and combinatorial selection
    • Abstract: Abstract A model of prebiotic synthesis and selection of macromolecules describing the origin of informative biopolymers is proposed; thermal cycling is considered as a driving force of the synthesis and evolution of prebiotic polymer systems. Kinetic models of prebiotic evolution and models of kinetic selection of optimal macromolecule configurations are provided. The proposed mechanisms of selection and competition are largely based on supramolecular interactions among monomers and polymers, as well as on the resistance of macromolecules to hydrolysis. The conditions of the interdependent coexistence of the three prebiotic polymer worlds are analyzed.
      PubDate: 2014-12-01
       
  • Preface to the special issue “Problems of the Origin and Evolution
           of the Biosphere”
    • PubDate: 2014-12-01
       
  • Life is a product of molecular ordering “machine”
    • Abstract: Abstract The main characteristic of life is the ordered state of living matter and the growth of order within the whole history of biological evolution. Any sustainable development requires the presence of an attractor. It is shown that consecutive ordering is due to steady-state systems. A novelty in the proposed concept consists in a combination of the principle of entropy disproportionation as a source of ordering with the steady state of a process responsible for the presence of an attractor. A remarkable property of ATP from the viewpoint of the ordering mechanism under consideration is that the reaction of ATP hydrolysis is universally conjugated with reactions of synthesis of biologically important polymers. Therefore, the appearance of ATP rather than of the “RNA world,” as in the well-known paradigm, must be considered the onset of the emergence and evolution of life. The chemical unit cell with ATP was the earliest form of the universal ordering “machine.” The proposed model of the ordering mechanism explains the uniqueness of the protein and nucleotide form of life in the Universe and some specific features of evolution that have not found explanation within the Darwinism theory, and also substantiate the requirement to the geological situation in which life appeared. The last ones, in addition to the usual conditions, i.e., the availability of an energy source and water, and an acceptable range of temperature, also involve the presence of a highly reducing environment and cyclic changes of environmental conditions, for example, alternation of day and night, drying and moistening, heat and cold, etc.
      PubDate: 2014-12-01
       
  • 238 U/ 235 U isotope ratio variations in minerals from hydrothermal
           uranium deposits
    • Abstract: Abstract The 238U/235U ratio was precisely measured in uranium minerals from 11 hydrothermal deposits of different geologic settings and ages situated in ore regions of Asia, Europe, Africa, and North America by MC-ICP-MS using a 233U-236U double spike. The spike was calibrated in reference to the CRM-112A standard with 238U/235U = 137.837 ± 0.015 (Richter et al, 2010). The long-term reproducibility of 238U/235U measurement was estimated as ±0.07‰ by the analysis of monitor samples and the IRMM-3184 standard. The analyses were performed using 0.02–0.04-mg microsamples of uraninite, pitchblende, and coffinite, which were locally extracted from polished sections under an optical microscope. The 238U/235U values obtained for 50 samples of U-bearing minerals range from 137.703 to 137.821, with a 0.86‰ difference and a mean 238U/235U value of 137.773 ± 0.056 (±2SD). The range of 238U/235U variations in seven deposits with uraninite is 0.41‰, which is twice as low as for the deposits with pitchblende-dominated ores. Our study provided the first results for 238U/235U variations in minerals from individual deposits. The largest variations were found in the Oktyabr’skii (Eastern Transbaikalia), Schlema-Alberoda (Erzgebirge), and Shea Creek (Athabasca basin) deposits: 0.70, 0.33, and 0.59‰, respectively. Uranium from the early growth zones of 4–5 mm thick pitchblende spherulitic crusts is isotopically heavier (by 0.22–0.45‰) than uranium from the latest growth zones. A similar isotopic shift in 238U/235U in terms of magnitude (0.31‰) and sense was observed between pitchblende and coffinite overgrowths. The uranium isotopic composition of late pitchblende generations, the products of dissolution and reprecipitation of early phases, is 0.46‰ lighter than that of early pitchblende phases. The character of uranium isotope distribution in pitchblende aggregates is consistent with nuclear-volume-dependent isotope fractionation accompanying U(VI) reduction to U(IV) (Bigeleisen, 1996; Schauble, 2007; Stirling et al., 2007), which causes an enrichment of the U(IV)-bearing solid phase in the heavy isotope 238U. The range of 238U/235U ratios for 11 hydrothermal (high-temperature) deposits (137.703–137.821) lies well within the broader (two-fold) range of values determined for the low-temperature deposits Dybryn in Transbaikalia (Golubev et al., 2013) and Pepegoona in South Australia (Murphy et al., 2014). This can be explained by the fact that the uranium isotopic fractionation associating with U(VI) → U(IV) reduction is accompanied by isotope shifts owing to the long-term interaction of groundwater with early phases within sandstone-type deposits. At the same time, owing to the higher temperatures (by 100–300°C) of formation of hydrothermal deposits compared with sandstone-type deposits, nuclear-volume-dependent uranium isotope fractionation decreases by more than a factor of 2 (Bopp et al., 2009).
      PubDate: 2014-12-01
       
  • Microheterogeneity of crystal growth zones as a result of REE
           fractionation
    • Abstract: Abstract Structural features of rhythmically zoned florencite and xenotime crystals from quartz veins of the Au-REE occurrences of the Near-Polar Urals are considered. The crystals were studied in the growth zones 0.01–0.15 mm wide. Rhythms consist of small structural elements: oriented intergrowths of several mineral species, layered-block distribution of Sr and Ca, syntaxic intergrowths of minerals of the same structural type, cocrystallization caverns, and late dissolution cavities with inclusions of argentite and pitchblende. The growth zones of crystals show successive change in lanthanides: from light to heavy REEs in florencite, and, vice versa, in xenotime, which is explained by the Ce and Y activity. The mechanism of element fractionation in the crystals is of dual nature. The rare-earth intergrowths contain four lanthanide groups: (La-Ce-Pr), (Nd-Sm-Eu-Gd), (Gd-Tb-Dy), (Ho-Er-Tm-Yb-Lu). This is caused by complexing ability of the elements, which is expressed in the tetrad effect of REE fractionation. Crystals, in turn, separate isomorphic complexes according to the properties of its facets and concentrations of elements in solutions. The structures of crystals and their growth elements are considered from the crystallochemical viewpoint.
      PubDate: 2014-12-01
       
  • Is the Fischer-Tropsch process possible in a geologic medium?
    • PubDate: 2014-12-01
       
  • Behavior of lanthanides during the formation of the Iul’tin deposit,
           Chukchi Peninsula
    • PubDate: 2014-12-01
       
  • Interaction of dissolved organic matter with Hg(II) along salinity
           gradient in Boston Lake
    • Abstract: Abstract Mercury pollution has become one of the serious ecological and health problems in developing countries. In aquatic environments, widespread dissolved organic matter (DOM) affects the physical transfer, chemical transformation and bioavailability of heavy metal ions. In the arid inland lakes, water salinity has been increasing due to close hydrological system and much higher vaporization than precipitation, and thus there are usually salinity gradients in these inland lakes. The change of salinity may exert influences on complexation of DOM with heavy metals. However, response of the metal complexation of DOM to the salinity is still unclear. In this study, three-dimensional molecule fluorescence spectroscopy (3D-EEM) was used to examine the interaction of Hg(II) and DOM in sediment along a salinity gradient of the Bosten Lake, the biggest inland freshwater lake in China. Three fluorescence peaks were identified in the EEM fluorescence spectra of all DOM samples. All the three fluorescence peaks could be quenched by Hg(II), indicating the formation of stable nonluminous DOM-Hg complexes. The conditional stability constant and binding constant for DOM-Hg(II) were 3.82–4.34 and 3.76–5.54, respectively. Conditional stable constants and binding constants for the system of Hg(II) and protein-like substances were higher than those for the humic substances-Hg(II) system. The ligand ratio of fluorophore to Hg(II) correlated well with the salinity. The strong complexation of Hg(II) and DOM and its responses to salinity change may significantly influence transport, transformation and ecological risk of Hg in Bosten Lake.
      PubDate: 2014-12-01
       
 
 
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