xrf in soils friable and marine sediments and ecological materials

... SAMPLING COLLECTION AND TESTING Plants, soils and water samples at six locations had been taken in order to quantify the leveling of arsenic contaminant Five sampling locations are within the interesting ... gold mine The results would give the preliminary informations for planning to use in this area which will be advantageous for managing the agriculture and living area in near future GENERAL INFORMATION ... arsenic contaminated in other medias not only in the water To acquire the solution, this study was performed to investigate the contaminant of arsenics in soils and plants compared to those in water...

Ngày tải lên: 25/04/2013, 08:21

Ngày tải lên: 13/11/2014, 16:00

... Within APEC little is known on the introduction of marine pests  Little practical information on measures to prevent introductions  Lack of knowledge in what individual countries are doing ... Conclusions, including the results of the November 2001 Workshop Management Framework - Introd uced Marine Pests Management capabilities and approaches  APEC and the MRCWG have a role in liaising with ... enhance the effectiveness of existing instruments within APEC  Institutional arrangements for managing the marine environment is fragmented in most economies  Baseline surveys to identify IMP are...

Ngày tải lên: 28/10/2013, 11:15

... Canada and the United States in protecting the Arctic marine environment: final remarks Both Canadian and US responses in protecting the Arctic marine environment are driven by individual national interests ... the landward side of the baselines appears to be unchallenged, subject, 16 17 19 D VanderZwaag, ‘Canada and Marine Environmental Protection: The Changing Tides of Law and Policy’, in D McRae and ... processes and systems, and genetic diversity will be maintained in the Arctic marine environment; See the discussion in D Pharand, The Northwest Passage Arctic Straits (Dordrecht: Martinus Nijhoff,...

Ngày tải lên: 01/11/2013, 09:20

... TOCa inoculum Pinney et al., 2000b Zsolnay and Steindl, 1991d; Qualls and Haines, 1992; Boissier and Fontvieille, 1993; Raymond and Bauer, 2001 inoculum + nutrients Zsolnay, 1996; Marschner and ... scarce and conflicting Jandl and Sletten (1999) observed inhibiting, enhancing and no effects of Al additions on the mineralisation of different DOM fractions from forest floor solutions Since ... drying and rewetting as an indicator of metal toxicity in soils Soil Biol Biochem 33, 235 – 240 Metting, F.B., 1993 Structure and physiological ecology of soil microbial communities In: Metting,...

Ngày tải lên: 15/03/2014, 23:22

Ngày tải lên: 15/03/2014, 23:22

... uptake by Chinese brake fern growing in arsenic contaminated soils; (2) to determine the effects of composts and phosphate rock on arsenic leachability in arsenic contaminated soils; and (3) to ... Chinese brake fern took up As mainly from Fe–As and Ca–As fractions in CCA soil, and from WE–As fraction in ASC soil Both compost and phosphate amendments increased As leaching from CCA soil in ... the DOC in both soils with more pronounced increase observed in the BS treatment (Fig 2c and d) In addition, the CCA soil contained more DOC than the ASC soil although the original OC in the ASC...

Ngày tải lên: 16/03/2014, 00:07

... fraction whereas Cu is mainly in the strongly bound organic and residual phases Hewitt and Candy (1990), examined levels of Pb, Cd and Zn in soil and dust samples collected in and around the city ... exists from wind-blown dust Disruption of these soils during highway maintenance, including mowing, and excavation for resurfacing, will cause suspension of these heavily contaminated soils as small ... on I-75 in Cincinnati, during five rainfall events in 1995 Their results showed that the event mean concentrations (EMC) HEAVY METAL CONTAMINATION IN SOILS OF URBAN HIGHWAYS 297 of Zn and Cu exceeded...

Ngày tải lên: 16/03/2014, 00:25

... EQUlLmRIA AND KINETICS IN SOILS (1.17) where Zi is the valence of the metal or ligand whose total molality is m Ti and the sum is over all metals (including hydrogen) and ligands (including hydroxide) ... mathematical expression for In 'Y ± (or In 'YM and In 'YL) should include both linear and bilinear terms in the molalities of all metals and ligands (or all charged species) in an aqueous solution ... compounds of principal interest in soils In this and subsequent chapters, Standard-State chemical potentials for gases, liquids, solids, and solutes usually will be taken from data in the following critical...

Ngày tải lên: 01/04/2014, 10:28

... tunnel linings in overconsolidated clay Proceedings 7th International Symposium of Institution of Mining and Metallurgy and British Tunnelling Society, Tunnelling 94, London, pp 469-481 Bộjui, H and ... shield tunneling, of external loading conditions, as defined in Pecks (1969) design principles These should include loads involved in handling pre-cast concrete segments and shield jacking operations ... Swelling Rock in Tunnelling Rock Mechanics and Rock Engineering, Vol 26, No 4, pp 307-311 Anagnostou, G and Kovri, K (1996a) Face Stability in Slurry and EPB Shield Tunneling Proceedings International...

Ngày tải lên: 11/07/2014, 15:20

... stability and transportability Settling rate experiments (Figure 2.2) indicated a decline in the concentration of kaolinitic colloids remaining in suspension at pH

Ngày tải lên: 11/08/2014, 10:22

... pioneering works in applying Gouy-Chapmann and Stern models to kaolinitic soils Since then, many articles in which modeling is performed have appeared in the literature.26,40–44 More recently, and ... resulting value for ∑s j int is 2.4 and thus LogK H = −7.9 In the case of the hydroxo group, there are two Si-O bonds, and one H donating and one H accepting bond Therefore, ∑s j int = and LogK ... performed a great deal of work since Pauling3 introduced the basis for explaining mineral structure and reactivity Our aims are to provide insight into the main processes that control the proton...

Ngày tải lên: 11/08/2014, 10:22

... 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 may be available in soils and sediments, ... Kubicki, J.D and Bleam, W.F., An introduction to molecular modeling, in Molecular Modeling of Clays and Mineral Surfaces, Kubicki, J.D and Bleam, W.F., Eds., Clay Minerals Society, in press 18 ... acids to mineral surfaces and their role in contaminant binding, Sci Total Environ., 118, 413, 1992 31 Myneni, S.C.B et al., Imaging of humic substance macromolecular structures in water and soils, ...

Ngày tải lên: 11/08/2014, 10:22

... crystalline and of mixed oxidation state (Hem and Lind, 1983; Murray et al., 1985; Adams and Ghiorse, 1988; Wehrli et al., 1992; Mandernack et al., 1995; Mandernack et al., 1995) Investigations using ... of spatial and temporal manganese flux, Can J Fisheries Aquatic Sci., 51, 185, 1994 Bartlett, R.J., Manganese redox reactions and organic interactions in soils, in Manganese in soils and plants, ... mediated mineral formation: Insights into manganese(II) oxidation from molecular genetic and biochemical studies, in Geomicrobiology: Interactions Between Microbes and Minerals, Banfield, J.F and Nealson,...

Ngày tải lên: 11/08/2014, 10:22

... 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 ... Chemical and mineralogical forms of Cu and Ni in contaminated soils from the Sudbury mining region and smelting region, Canada, Environ Pollut., 91, 11, 1996 40 Song, Y et al., Chemical and mineralogical ... are in the left panel (solid line = raw data and dashed line = LCF result) and the corresponding radial structure functions (solid line = raw data and dashed line = shell fitting result) in the...

Ngày tải lên: 11/08/2014, 10:22

... concentrations of Cd and Zn decreased following saturation, and Ni decreased in two of the three soils These decreases in metal solubility coincided with a pH increase in all three soils, and were attributed ... conditions, J Colloid Interface Sci., 227, 531, 2000 12 Kashem, M.A and Singh, B.R., Metal availability in contaminated soils: I Effects of flooding and organic matter on changes in Eh, pH, and solubility ... 56, 1004, 1992 35 Kretzschmar, R and Voegelin, A., Modeling competitive sorption and release of heavy metals in soils, in Heavy Metals Release in Soils, Selim, H.M and Sparks, D.L., Eds., CRC Press,...

Ngày tải lên: 11/08/2014, 10:22

... sorption 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 ... Fe, Al and other trace metals) and organic and inorganic pollutants in soils (Qualls and Haines, 1991; McCarthy and Zachara, 1989; Kaiser and Zech, 1998; Berggren et al., 1990; Maxin and Kögel-Knabner, ... N.J., Copper reactions with inorganic components of soils including uptake by oxide and silicate minerals, in Copper in Soils and Plants, Loneragan, J.F., Robson, A.D., and Graham, R.D., Eds., Academic...

Ngày tải lên: 11/08/2014, 10:22

... altering the system during the sampling and handling processes before analysis.25 11.2.3 LASER DOPPLER VELOCIMETRY AND PARTICLE CHARGE Evaluating particle surface charge is critical to understanding ... separates containing layer silicates and iron and aluminum oxides, Soil Sci Soc Am J., 56, 1074, 1992 Golden, D.C and Dixon, J.B., Silicate and phosphate in uence on kaolin-iron oxide interactions, ... McCarthy, J.F and Degueldre, C., Sampling and characterization of colloids and particles in groundwater for studying their role in contaminant transport, in Environmental Particles, Buffle, J and van...

Ngày tải lên: 11/08/2014, 10:22

... fetida) and springtails (Folsomia candida)) and microbes (potential nitrification rate and glucose induced respiration) in the same soils that were used for the corresponding speciation studies, and ... (DOC) In aquatic systems, DOC is the dominant complexing agent for metals and thus it is integral to the aqueous speciation modeling However, in soil systems, the contribution of DOM in binding ... (y-axis) and various TBLM parameters (x-axis): (c) log KHBL, and (d) log KHBL In the calculations, the value of β is fixed at 2.60 in all cases Only H+ was included in (c) and both Ca2+ and H+ were included...

Ngày tải lên: 13/11/2014, 11:21