the relationships between the phytoavailability and the extractability of heavy metals in contaminated soils
Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 2 pps
... spent by the colloids within the monoliths Since the number of interactive exchange sites available on the eluting colloids is limited compared to the sites available within the matrix of the entire ... colloid behavior The presence of colloids in the flushing suspensions enhanced the transport of both soluble and colloid-bound Pb fractions Since the soluble source of the Pb in the macropore space ... patterns shown by the settling kinetics experiments (Figure 2.10) It is interesting that in spite of the high EC and, therefore, increased ionic strength of the LSB+CaCO3 colloids, their high pH...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 4 docx
... unraveling the affinity of mineral surfaces for both inorganic and organic species The main effects of proton adsorption-desorption on the adsorption of metals in general and heavy metals in particular ... potential and represents the difference in the electrical potential between the surface and the bulk solution, and aH represents the activity of protons in the bulk The combination of equations 4.2 and ... to be one of the most complete and reliable in the literature because of the success in passing the test The clay fraction (75%) contains mainly kaolinite, and also a small amount of vermiculite...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 5 pptx
... development of more hydrophobic regions and coiling of the C backbone could increase the sorption of hydrophobic contaminants and increase the sequestration capacity of the NOM All these components ... dissociating the Al3+-HA complex, diminishing the presence of water locally around the region of the HA bonded to Al3+ could severely inhibit the tendency of the complex to dissociate.84 5.3.4 PYRIDINE ... presented in Figure 5.9 show that the previous model calculations overpredicted the amount of interaction between H atoms attached to the benzene ring (both in benzene and pyridine) and the O atoms in...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 7 pptx
... adsorption isotherm (Figure 7.4) (Nelson et al., 1999b) The steep isotherm is important because it indicates that the difference between the adsorption of the biogenic Mn oxide and the abiotic ... additivity of their Langmuir isotherms (compare columns to in Tables 7.4 and 7.5) These results suggest that interactions between the Mn and Fe oxides under these conditions did not alter the adsorption ... Langmuir adsorption isotherms, was used to estimate the relative contributions of each surface coating constituent to total Pb and Cd binding of the biofilms The results agreed with the experiments described...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 8 ppsx
... successful in identifying Zn-bearing phases in the subsoil, indicating that Zn was not found in abundant portions in any one phase Aluminum, Si, and Fe in the maps in the subsurface soil indicated the ... phase or other minerals in the matrix which may cause fluorescence, resulting in an interference with the spectrum of the central element of interest (e.g., for Co and Ni in samples containing Fe ... determine and understand the nature of the interactions of metal ions with these reactive sites These interactions can be considered one portion of the overall concept of metal speciation in soils...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 9 pps
... during reduction, then the model must account for both the change in the dissolution rate of Mn oxides and the repartitioning of metals to specific adsorption sites 9.4 SUMMARY The changes in the ... EC is in molc l−1 Although soluble concentrations of K and Na changed slightly between 24 and 84 h, these cations were not included in the calculation of EC as they were not included in the cation ... behaving as an exchangeable cation in the soil, very similar to Ca and Mg The relative increase in the concentrations of Sr, Ca, and Mg between 24 and 84 h was very similar to the relative increase...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 10 ppsx
... in soils In most agricultural soils with pH ranging from to 8, such as soils containing larger amounts of 2:1 minerals, DOM, is mainly present in the mobile form instead of adsorbed form in these ... variety of soils with clay contents ranging from to 54%, showed that the adsorption of the DOC by soils increased as the clay, organic matter contents, and the surface areas of the soils increased The ... pointed out that the HiB fraction mainly consisted of the N-containing group, including most amino acids, amino sugar, low-molecular-weight amines, and pyridine, while the HiA fraction contained...
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Geochemical and Hydrological Reactivity of Heavy Metals in Soils - Chapter 11 ppt
... in the SEM as a consequence of inelastic scattering events, with the resulting spectra consisting of two distinct components: “characteristic” x-rays indicative of the atomic composition of the ... extensive review of the application of TEM to the study of soil minerals Interaction of the electron beam with the specimen in the TEM produces the same x-ray signals observed in the SEM: characteristic ... regions of the sample closer to the initial probe location The in uence of sample coating on SEM imaging and EDS analysis has frequently been neglected A fraction of the beam electrons lose their initial...
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Effect of poverty on the relationship between personal exposures and ambient concentrations of air pollutants in ho chi minh city
... Residents of District spent 213 more time in traffic, sleeping and in the bedroom, while residents of BT spent more time engaged in other 214 activities, in the living room and using a fan 215 From the ... we examined the correlation between 277 the average of the two monitoring stations with the repeated measurements of study participants Figure 278 shows the results of the analysis of the correlation ... without including SES and offering all significant predictors in 386 the bivariate analysis; second forcing SES in the same models Should the TAP and questionnaire 387 variables be explained by the...
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Measurement and behaviour of heavy metals in the marine environment of singapore
... 2.4 Chemical speciation of heavy metals in marine sediments Increasing awareness of the important role of sediments in the transport and storage of heavy metals in the marine environment has led ... dissolution and release the metals to the water column The results in the depletion of the recycled heavy metals in surface waters and enrichment at depth Bio-limiting heavy metals: Bio-limiting heavy ... studies on heavy metal pollution in the marine environment of Singapore and data on the vertical distribution of heavy metals in the seawater column are lacking In addition, there have been no investigations...
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Báo cáo khoa học: Photosynthetic acclimation: State transitions and adjustment of photosystem stoichiometry – functional relationships between short-term and long-term light quality acclimation in plants ppt
... in May 2004 in the surroundings of Jena) The range of photosynthetically active radiation (400–700 nm) and the absorption maxima of PSII and PSI (680 and 700 nm) are marked along the top of the ... the PQ–cyt b6f complex and ⁄ or the ferredoxin ⁄ thioredoxin system (Fig 3) The interplay between the kinases and their substrates integrates these varying redox signals and initiates appropriate ... days and seasons) Important abiotic determinants include the geographical latitude of the ecosystem, the appearance of clouds and the leaf movement by wind Biotic in uences depend mainly on the individual...
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Development of novel titanate nanotubesreduced graphene oxide composite for the removal of heavy metals from aqueous solution
... aluminum, platinum and copper in the form of metal ions They enter the body through the streets of the body to absorb as respiratory, gastrointestinal and through the skin If heavy metals enter the ... that of GO, indicating a lower density of defects present in rGO Second, the G band shifts by ~ 5cm−1 in the rGO-TNT Therefore, both the change in Raman band intensity and the blue shift of the ... Overview of heavy metals 2.1.1 Definitions and sources of heavy metals The origin of the term "heavy metal" is not clear An early use dates from 1817, when Gmelin divided the elements into nonmetals,...
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Báo cáo lâm nghiệp: "Relationships between the parameters of aboveground parts and the parameters of root plates in Norway spruce with respect to soil drainage" docx
... even lower in the case of spruce trees growing in well-drained sites Interestingly, in either of the localities no correlation was determined between the crown proportion index and the root plate ... cm in trees growing in well-drained sites Therefore, we have not found out any large differences in the calculated mean values of AWrp, St and Sv between the trees growing in the waterlogged and ... out differences in root plate parameters between the Norway spruce trees growing in the waterlogged and in the well-drained sites The mean value of Wrp was 500 cm in trees growing in waterlogged...
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Báo cáo lâm nghiệp: "Relationships between hydraulic traits and habitat preference for six Acer species occurring in the French Alps" pptx
... diameter of the stem segments used as indicated by the strong coefficients of determination obtained for every individual The analysis of variance and the tests of TuckeyKramer indeed showed that the ... by increasing their resistance to cavitation [13], one of the major causes of decline in the botanical species in the absence of water [5] In contrast, Acer species are more restricted to their ... conditions in the low mountain stand (La Bastille, closed symbols) For A monspessulanum, three individual trees in the mountain stand were compared with a tree of the wet site (closed symbols) The linear...
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Báo cáo y học: "How the relationships between general practitioners and intensivists can be improved: the general practitioners'''' point of view" ppt
... activity, working area, population of working city, and distance between their office and the nearest university hospital ICU In addition, information concerning the number of patients per year, the way ... assessing the opinions of GPs about their relationships with intensivists Page of and two epidemiologists (TM and PFP)) and was divided into five parts (English version in Additional file 1) Professional ... the occurrence of a GP/relative meeting during the patient ICU stay (frequency and the aim of these meetings) The frequency of reception of an ICU report was estimated GPs' wishes Materials and...
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Investigating the relationships between intrinsic motives and willingness to contribute knowledge to close and distant colleagues
... understanding within the collective; and (3) Relational capital, referring to the characteristic of relationships within the collective, including the trust of reciprocity within, and the identification ... motivator on intrinsic motivation per se, but rather due to the activation of a competing intrinsic motive by the extrinsic motivator which results in the individual abandoning the original behavior ... engage in a particular behavior The individual will assess the match-up between intrinsic motives and the situational factors and make choices based on the likelihood of fulfilling the intrinsic...
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Interpreting the relationships between network closure and firms competitive advantages a knowledge based perspective
... that there existed positive interactions between interorganizational learning and intraorganizational learning, and in this sense they were two complementary tasks that when handled hand in hand ... were the two types of intermediary learning that tied up exploitation and exploration, and “extension and internalization” were the other two types of intermediary learning that tied up intra- and ... capacity as the nexus between internal and external learning, and it could be one of the key mechanisms in creating synergy between the two learning activities Fourthly, studying contingency factors...
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The interaction between climate and the processing of coated papers in printing and finishing pot
... tearing in the internal structure of the paper and blistering in the printed areas (see figures) binding agents and coating pigments used, the amount of binding agents contained in the paper and ... The situation in paper production and printing industry ˿ The situation in printing and finishing industry ˿ Circumstances in the workshop ˿ Paper handling 11 ˿ ˿ ˿ ˿ Blistering Breaking in the ... bars and the former fold, causing the print to smear and preventing successful processing in the folding unit Two-sided printing in a printing unit Heatset inks settle (or “set”) when the thin-liquid...
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Báo cáo hóa học: " The relation between Ashworth scores and neuromechanical measurements of spasticity following stroke" doc
... participated in performing the experiments, interpreting data and writing the paper WZR participated in interpreting data and writing the manuscript, RLH participated in interpreting data and writing the ... reflex and intrinsic mechanical properties were estimated using the difference between the slope/intercepts of the paretic and the slope/intercepts of the nonparetic side Since abnormalities in the ... torque as the output The intrinsic and reflex stiffness IRFs were convolved with the experimental input to predict the intrinsic and reflex torque, respectively IRFs were assessed in terms of the percentage...
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Báo cáo y học: "Collaboration between general hospitals and community health services in the care of suicide attempters in Norway: a longitudinal study" ppt
... Predictors of a chain of care structure in the CHS To examine whether quality of care indicators at EDs in 1999 could predict whether or not the CHS had a chain of care structure in 2006, a series of ... CHS with and without a chain of care structure Including the variable 'chain of care programme during the late 1990s' in the analysis increased the correct classification in 1999 (79%) and 2006 ... at the hospital level might be important aspects in fostering the presence of a CCS in the CHS Regular training and supervision of staff in the assessment and psychosocial care and aftercare of...
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