clay silt and sand found in soil

Bioavailability and toxicity of cd to microorganisms and their activities in soil

Ngày tải lên : 15/03/2014, 23:21

... cause a 10% decrease in urease activity after week incubation amounted to 150 in sandy loam soil, 360 in silt loam, 950 in clay soil and 1980 in sandy peat soils (Doelman and Haanstra, 1986) The ... of glutamic acid in both sandy and silty loam soils, but not in clay and sandy peat soils (Haanstra and Doelman, 1984) The mineralization of carbon and nitrogen in different soils were related ... shown to be inhibitory to denitrification in a silt loam soil at 10 mg kgy1 (Bollag and Barabasz, 1979), and in clay and sandy loam soils, but only at )50 mg kgy1 soil (McKenney and Vriesacker,...

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Báo cáo lâm nghiệp: "Eﬀect of single Quercus ilex trees upon spatial and seasonal changes in soil water content in dehesas of central western Spain" potx

Ngày tải lên : 07/08/2014, 16:21

... in the undisturbed soil During installation, eﬀorts were made to ensure maximum contact between the rods and the soil Soil was drilled with a stainless steel soil column cylinder with a cutting ... Walkley and Black method, using samples for all distances, but grouping them every 40 cm, below m depth A total of 237 determinations were made Texture (sand, silt and clay contents) and retention ... holding capacity beneath the canopy could be explained by the observed increase in soil organic matter and clay content, and the improvement of the soil structure (decrease of bulk density) in...

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Environmental chemistry of explosives and propellant compounds in soils and marine systems distributed source characterization and remedial technologies

Ngày tải lên : 13/03/2018, 15:02

... 0.50 and 0.338) and nine weapons (Browning and Sig Sauer pistols, rifle C7, carbine C8, machine guns C6, C9 and M2HB, and rifles McMillan and Timberwolf) Samples were collected in aluminum containers ... Employing a multi-linear regression analysis from the data contained in Brannon and Pennington (36), and additional information from the original papers cited in that publication (including pH, ... retroactive modeling of contaminants in order to reconstruct a reasonable baseline survey for determining pre-conflict contaminant levels The principles included in this book, and in particular,...

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the binding and availability of 2,4,6-trinitrotoluene (tnt) from sand, clay minerals, and soils the effects of aging and the implications for biotreatment

Ngày tải lên : 13/11/2014, 15:42

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DSpace at VNU: Clay dispersion and its relation to surface charge in a paddy soil of the Red River Delta, Vietnam

Ngày tải lên : 12/12/2017, 06:36

... at soil pH according to Pleysier and Juo, 1980), Ca (62%) and Mg (30%) are the most common cations In paddy soils, flooding and tilling for a new crop can facilitate the dispersion of clay In ... from a typical paddy soil of the RRD were determined at different pH and concentrations of cations and anions, which are found in the soil solution Soaking of a soil sample in water under anaerobic ... measured in the experiments after clay flocculation is probably due to the presence of DOM in the supernatant In soils, the competitive binding of H+ and Ca2+ by soil functional groups affects SC and...

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Chromium speciation in municipal solid waste: Effects of clay amendment and composting

Ngày tải lên : 23/09/2012, 14:48

... factor in assessing the role of clay addition in controlling the mobility and plant availability of metals (Qiao et al., 1993) In order to determine the long-term fate and potential hazard of land ... 20% Zn in leachable form and 77% Zn in plant available form in the blank MSW sample, but in sewage sludge only less than 1.5% Zn was in leachable and 29% Zn in plant available form (Qiao and Ho, ... the insoluble humin fraction that was produced in the composting process (Fig 1) In contrast to the decrease of soluble organic matter during sludge composting, it gradually increased during...

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arsenic contamination in soils, water and plants

Ngày tải lên : 25/04/2013, 08:21

... composed of alternating layers between clay, silty clay and sandy silty clay which are smaller grain sizes and higher cohesion than purely sandy soils Because of their small grain sizes and high cohesions, ... contamination in soil Soil samples from locations, called in corresponding points as bore holes (BH) number, were classified using the Unified Soil Classification System Soil profiles and their ... 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...

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ARSENIC POLLUTION IN SOIL AND GROUNDWATER OF BANGLADESH

Ngày tải lên : 05/09/2013, 08:40

... fine sands, and muds occur at an interval of 3-4.9m (upper muddy layer) Sands are composed of well sorted quartz grains accompanying significant mica flakes Tourmaline and zircon are ... horizon 27.7m and 28.9 m shown in SiO2/Al2O3, Al2O3/TiO2 ratios, which may be due to influx of coarse sands Table Rare Earth Elements And Other Trace Elements Found In Core Sample In Samta INAA No ... to be confined to the intermediate aquifer (30-45 m depth) 4.0 million Tubewells in Bangladesh Supplying Drinking water to the people and among them 1.12 million Tubewells are contaminated with...

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Evaluation of Dredged Sediment as a Silt and Clay Source for Artificial Tidal Flats

Ngày tải lên : 05/09/2013, 09:38

... mountain sand and DS giving 5% and 10% silt and clay content We placed cm depth of these mixtures into 10 L aquaria into which sand- filtered seawater flowed 30 individuals of R philippinarum ... difference in silt and clay content As shown in Table 4, the silt and clay content in E3 was about 15-30% Although the silt and clay content (64%) in C3 was measured only once during the experimental ... and 3/100 slope In this trial, PS treated DS, PAC treated DS, and untreated DS were each mixed with mountain sand (1.6% silt and clay) to achieve 25% of silt and clay content (Table 3) This silt...

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Báo cáo "The effect of Cu concentration in soil and phosphorous fertilizer on plant growth and Cu uptake by Brassia juncea L. grown on contaminated soils " doc

Ngày tải lên : 14/03/2014, 15:20

... water and then dried at 70oC until stabilisation of weight The monitoring indicators for plants growth include plant height and biomass Total Cu in soil and plant tissues, Cu2+ (HNO3 0.43N) in soil ... concentration in soil and Cu content in plant shows a significant positive effect (Fig 1) Table The contents of Cu2+ in soil, Cu content in plant and plant height (fresh weight) Cu2+ in soil Plant ... Cu2+ in soil with plant growth and Cu accumulation in plant The relationship between Cu concentration in soil and biomass of Brassica juncea is presented in Table The highest plant height and...

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USEPA REGION 9 TECHNICAL GUIDELINES FOR ACCURATELY DETERMINING VOLATILE ORGANIC COMPOUND (VOC) CONCENTRATIONS IN SOIL AND SOLID MATRICES potx

Ngày tải lên : 14/03/2014, 20:20

... or sampling and analysis plan (SAP) Region 9’s guidelines for measuring VOC concentrations in soil and other solid matrices include the following: Samples should be handled as intact soil cores ... Organic Compounds in Soil Subsamples US Army Cold Regions Research and Engineering Laboratory, Special Report 95-5 Hewitt, A.D and J.E Lukash (1996) Obtaining and Transferring Soils for In- Vial Analysis ... should be handled in intact soil cores and stored in hermetically sealed vessels in both the field and the laboratory December 2005 -9- EPA Region Technical Guidelines for Accurately Determining Volatile...

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Concentration and chemical speciations of cu, zn, pb and cr of urban soils in nanjing, china

Ngày tải lên : 15/03/2014, 23:22

... increased with the increase of clay content (Xu and Yang, 1995; Liu, 1996) Lu (2000) reported that Cu, Zn, Pb and Cr in Nanjing urban soils were mainly originated from anthropogentic input, and ... value of soils in China and twice as much as the natural background value of soils in the Nanjing area The mean total Pb concentration is four times more than the mean value of soils in China and ... background value of soils in the Nanjing area The mean total Cr concentration is higher than the mean value of soils in China and the natural background value of soils in the Nanjing area Taking the natural...

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Concentration and distribution of extractable elements in soil as affected by tillage systems and fertil

Ngày tải lên : 15/03/2014, 23:22

... elements are normally found in phosphate fertilizers ŽCharter et al 1995; Todorova and Dombalov 1995 and fertilization for long periods increases their concentration in soils ŽHe and Singh, 1993b; Taylor, ... Jeng and Slingh, 1995 The bioavailability of these elements depends upon their chemical forms in soils, which is related to clay content and mineralogy, the organic matter type and content, pH and ... slightly higher pH values and lower OM and Al Only the higher contents of Co, Pb and Zn in top soil under ZT were related to higher OM and Al contents and lower pH in those soils The comparison between...

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Controls of bioavailability and biodegradability of dissolved organic matter in soils

Ngày tải lên : 15/03/2014, 23:22

... after soil 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: ... 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 ... active sand was used as an inoculum Biologically active sand was used as an inoculum besides suspended inocula d No direct addition of inoculum; use of unfiltered samples (Zsolany and Steindl,...

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Crop uptake and extractability of cadmium in soils naturally high in metals at different ph levels

Ngày tải lên : 15/03/2014, 23:22

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Arsenic solubility and distribution in poultry waste and long term amended soil

Ngày tải lên : 15/03/2014, 23:49

... waste-amended soil Soil Sci 2000;165:260 –268 Han FX, Banin A, Triplett GB Redistribution of heavy metals in arid-zone soils under a wetting–drying soil moisture regime Soil Sci 2001;166:18 –28 Hingston ... determined following the methods of Karathanasis and Hajek (1982) and Karathanasis and Harris (1994) Samples were pretreated to remove salts, carbonates, OM and Fe oxides, and the fine clay- sized ... with high binding affinity for As It has been shown that incorporation of alum into poultry-house bedding materials significantly decreases soluble As concentrations in poultry wastes and in runoff...

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Effect of cd and as in soil on growth availability to plant

Ngày tải lên : 16/03/2014, 00:07

... As and Cd on the growth of chinese cabbage, radish and lettuce and to establelish the critical level of elements in chinese cabbage, radish and lettuce Materials and Methods A silty loam soil ... edible part of chinese cabbage, radish, and lettuce grown at the Cd treated soils Contents of As and Cd in edible part of chinese cabbage, radish, and lettuce The contents of As and Cd in agricultural ... contents in brown rice were 0.41 and 0.52 mg kg-1 FW at the 10 mg kg-1 As treated loam and sandy loam soils, respectively The contents of As in edible part of chinese cabbage, radish and lettuce...

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Effects of compost and phosphate amendments on arsenic mobility in soils and arsenic uptake by the hyper

Ngày tải lên : 16/03/2014, 00:07

... 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 ... 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 soil ... Al–As in the CCA soil For the ASC soil, however, treatments decreased Fig Soil pH (a and b) and DOC (c and d) in the CCA (a, c) soil and ASC (b, d) soil samples after compost and phosphate treatments...

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Heavy metal contamination in soils of urban highways (comparision between runoff and soil concentration

Ngày tải lên : 16/03/2014, 00:25

... 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 ... contamination of soils along highways, with the main emphasis on Pb For example, Vandenabeele and Wood (1972), who worked on highway soil samples in Utah, found 180 to 215 ppm Pb in surface soil and ... 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...

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Báo cáo khoa học: Acute intermittent porphyria – impact of mutations found in the hydroxymethylbilane synthase gene on biochemical and enzymatic protein properties pdf

Ngày tải lên : 23/03/2014, 04:21

... porphobilinogen (PBG) deaminase gene mutations in acute intermittent porphyria: ﬁrst study in patients of Slavic origin Scand J Clin Lab Invest 57, 217–224 24 Chen CH, Astrin KH, Lee G, Anderson ... in black The interacting partners of the mutated residues are shown in yellow and the dipyrromethane (DPM) cofactor is shown in the ball and stick representation Magenta indicates the beginning ... (1989) A point mutation G-A in exon 12 of the porphobilinogen deam- Mutations found in the HMBS gene 32 33 34 35 36 37 38 inase gene results in exon skipping and is responsible for acute intermittent...

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