heavy metals in soils and their environmental significance

... important findings and accordingly suggests relevant research directions in future.Heavy Metals and SOiÌS - 2S nọ 6Cadmium (Cd) and copper (Cu) are of interest in this study, since they are included ... The interactions between metals and soils also determine the bioavailability and transport of metals in soils Therefore, the nature of soil components, metal sorption mechanisms, and corresponding ... according to Dutch Soil Standard In addition, in view of the high toxicity of Cd to human health, the maximum contaminant levels of Cd and Cu in drinking water are 0.005 and 1.3 mg/L, according

Ngày tải lên: 02/10/2024, 01:36

... may havealso enhanced their stability and transportability Settling rate experiments (Figure2.2) indicated a decline in the concentration of kaolinitic colloids remaining insuspension at pH <5.5 ... have increased the soluble metal load These findings clearly demonstrate the role of colloid mineralogical composition on their ability to induce and mediate the transport of heavy metals in subsurface ... migration following humus disintegration has been found to be the maintransport mechanism for Pb in subsoils of forested ecosystems in Switzerlandaffected by the nearby aluminum industry [19] Similarly,

Ngày tải lên: 11/08/2014, 10:22

... metal–water and oxide–water interfaces Van Raij and Peech27 carried out pioneering works in applying Gouy-Chapmann and Stern models to kaolinitic soils Since then, many articles in which ... performed a great deal of work since Pauling 3 introduced the basis for explaining mineral structure and reactivity. Our aims are to provide insight into the main processes that control the ... adsorption and desorption at the mineral–water interface are important processes in soils, sediments, surface waters, and groundwater. By capturing or releasing ions, mineral surfaces play key roles in

Ngày tải lên: 11/08/2014, 10:22

... Molecular Modeling of Fulvic and Humic Acids: Charging Effects and Interactions with Al 3+ , Benzene, and Pyridine James D. Kubicki and Chad C. Trout CONTENTS 5.1 Introduction 5.2 ... ring among the physical, chemical, and biological processes in soils creates an immense challenge for anyone attempting to understand soil formation and behavior. For example, organisms mine soils ... consisting of each of the components discussed above: a model of HA complexed with Al3+ interacting with benzene and pyridine in water Charging and conformational changes in dissolved

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 ... Formation of Biogenic Manganese Oxides and Their Influence on the Scavenging of Toxic Trace Elements Yarrow M Nelson and Leonard W Lion CONTENTS 7.1 Introduction 7.2 Kinetics of Biological Mn Oxidation ... absorption fine structure (XAFS) have begun to elucidate the mineralogy of microcrystalline regions in Mn oxides and Mn oxyhydroxides (Manceau and Combes, 1988; Friedl et al., 1997) Co, Zn, Ce, and trivalent

Ngày tải lên: 11/08/2014, 10:22

... 8 Zinc Speciation in Contaminated Soils Combining Direct and Indirect Characterization Methods Darryl Roberts, Andreas C. Scheinost, and Donald L. Sparks CONTENTS 8.1 Introduction ... anthropogenic and natural input of heavy metals has established the need to investigate and com- prehend metal–soil interactions. The pathways for heavy metal introduction into soil and aquatic ... bioavailable metals. 45 In doing so, the process of sequential extractions will become more complete and universal, significantly improving our understanding of metal partitioning and mobility in soils.

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 ... findings are summarized here The soluble concentrations of Mn, Zn, Ni, and Sr increased in both soils following reduction Total electrolyte concentration also increased following reduction, and ... may also be retained by specific adsorption reactions,19 involving surface hydroxyl sites on mineral and organic soil colloids The partition-ing of metals between these sites and the solution

Ngày tải lên: 11/08/2014, 10:22

... P, Fe, Al and other trace metals) and organic and inorganic pollutants in soils (Quallsand Haines, 1991; McCarthy and Zachara, 1989; Kaiser and Zech, 1998; Berggren et al., 1990; Maxin and Kögel-Knabner, ... (C-N stretch in amino acid and C-O stretch in charides and carboxyl); and a sharp peak at 620 to 700 cm−1 ( C-H bending inaromatic ring or C-H deformation of carbohydrates) (Morrison and Boyd, 1983).The ... predicthow much DOM and DOM-facilitated solutes are transferred to aquatic environ-ments without better understanding of the behavior of DOM itself and interaction of DOM and metals in soils The aim

Ngày tải lên: 11/08/2014, 10:22

... discussed in a subsequent section may beappropriate Recent advances in LDV instrumentation have focused on reduc-ing/eliminating the need for optical alignment, and automating certain time-consum-ing ... the characterization of environmental colloids are discussed Those inter-ested in an in-depth treatment of light-scattering methods and their application tothe study of environmental colloids ... measuring dilute suspensionsand less sensitive to minor changes in instrumental design Sensitivity increases withpath length; however, linearity is sacrificed at higher suspension concentrations andself-quenching

Ngày tải lên: 11/08/2014, 10:22

... alkaline (6.1–8.4) in most paddy and upland field soils 3.1 Total and HCl-Extractable Heavy Metals The ranges and means of total and HCl-extractable metal contents in surface and subsurface soils ... total metal concentrations in the soils (Ho and Egashira 2001; Trinh and Wada 2004; Le 2002); no detailed investigation of contents and chemical forms of heavy metals in soils of the Red River Delta ... rapid intensification of industrial activities including copper and lead casting, phosphorous fertilizer production, chemical manufacturing, etc., has been indicated to have introduced heavy metals

Ngày tải lên: 14/12/2017, 17:50

... productive processes, mining process, refining ore, metals, Moreover,heavy metal compounds are widely used in industrial processes such as coloring anddyeing, in tanning, rubber, textile and paper products, ... washing and soaking process inthe tanks containing copper.Copper and brass tanks are often subjected to strong acids, in their containment processes, containing solutions, which oxidize copper into ... modification 13 1.5 Heavy Metal in Wastewater 14 1.5.1 Heavy Metal in Wastewater 14 1.5.2 Effect of some heavy metals on living body and human 15 1.6 Some general methods in treatment heavy metals 17 1.6.1

Ngày tải lên: 27/07/2017, 23:17

... small scale industries such as colouring, electroplating, metal surface treatments, fabric printing, battery and paints, releasing Cr, Fe, Cu, Pb, Zn, Ni, Mn and other heavy metals into water ... and standard deviations of the heavy metal concentrations in wastewater were calculated Results and Discussion In the present investigation a total of seven heavy metals were recorded in Khandari ... not safe for drinking and cooking This study recommended the continuous monitoring of Cr, Mn, Ni, Zn, Cu, Fe and Pb in water Narmada River should be assessing at times to study heavy metal as

Ngày tải lên: 16/05/2020, 02:51

... Pb, As and Se in tea leaves and soils from tea plantations; (2) to report the degree of contamination and daily intake of toxic heavy met-als via tea (3); to measure the interaction of heavy metal ... for heavy metals in the investigated tea samples decreased as follows: Cd > As > Se > Pb In general, the TFs increased with decreasing metal concentrations in soils Thereby, lower TFs in ... of heavy metals from food can lead to their accumulation in the kidney and liver, causing disruption of numerous biochemical processes and potentially caus-ing cardiovascular, nervous, kidney and

Ngày tải lên: 29/05/2020, 14:09

... been used for determination of Cd, Pb, and Sn in foods, cosmetics, and solid environmental samples Among these techniques, FAAS is widely used for determination of heavy metals in various matrices ... methanol (containing 0.1 mol L−1 HNO3) By only varying the burner and the radiant source, the contents of Cd, Pb, and Sn in samples were monitored and determined by FAAS To determine the effects ... Online: 10.09.2016 • Final Version: 22.12.2016 Abstract: In the current study, a simple and efficient analytical method for preconcentration and determination of Cd(II), Pb(II), and Sn(II) in some

Ngày tải lên: 13/01/2022, 00:14

... extracted and utilized. The economic benefits of mining and selling lead and lead products were large, and the cost of damaged ecosystems seemed minor. The regulations governing the mining and processing ... was established in 1872, and the formation of the Sierra Club, which formed in 1892. In addition, certain federal lands were set aside and were exempt from mining activities and mining rights previously ... WETLANDS FOR THEIR REMOVAL STATUTORY ANALYSIS Mining Law of 1972 The statutes that govern lead mining today date back to the General Mining Law of 1972. In passing this law, Congress intended

Ngày tải lên: 18/06/2014, 19:20

... LLC Trang 11182 HEAVY METALS IN THE ENVIRONMENT: USING WETLANDS FOR THEIR REMOVALexposed sediments in Steele City Bay (locations F, G, and H) and in the reference forest area (see individuals planted ... calculated using three indices The Shannon diversity index is given by where H ′ is the information in bits per individual, pi is the proportion of individuals in a sample belonging to taxon i, and n ... AREA INDEX The leaf area index of floating vegetation was measured using a line-intercept transect 5 m in length The intercept lengths were recorded for individual leaves of Nymphaea Totals of intercept

Ngày tải lên: 18/06/2014, 19:20

... concentrations and s-creatinine, this could in part be explained by an impaired renal func-tion in elderly patients, which is in line with previous findings demonstrating an association between increased ... proteins and activates other MSPs and MMPs [8,9] TATI is a trypsin inhibitor that balances concentrations of trypsin and also functions as a weak inhibitor of other serine proteinases [10,11] In ... on tissue and serum concentrations of tumour associated trypsin inhibitor and their prognostic significance in rectal cancer patients Alexander Gaber1, Christina Stene2, Kristina Hotakainen3, Björn

Ngày tải lên: 09/08/2014, 09:21

... and rivers Some of the anthropogenic sources of heavy metals include industrial wastes and by-products generated by mining and smelting, production and use of materials containing the heavy metals, ... certain main anthropogenic sources of heavy metal pollution (Csuros et al., 2002): ™ Mining and processing ores: Digging a mine, removing ore from it, and extraction and processing of the minerals ... heavy metals in the marine sediments in order to understand their relative mobility and bioavailability in the marine environment; and (iii) to determine prevailing levels of heavy metals in representative

Ngày tải lên: 10/11/2015, 12:34

... gelatinolysis inhibition to papain was employed As shown in Fig 3, at least two different kinds of strong staining bands of 78 kDa and 15 kDa and very weak staining bands of 65 kDa and 20 kDa in ... trypsin; Lane 2 is with gelatin gel and lane 3 is without-gelatin gel as the control The remaining gelatin band in the soybean trypsin inhibitor band of 25 kDa is stained by Coomassie blue in lane ... trypsin inhibitor for trypsin and cystatin C or lactoferrin for papain Lanes 1 and 8 are molecular markers (a) Soybean trypsin inhibitor was applied in lanes 2 and 3, and embedded gelatin was

Ngày tải lên: 16/12/2017, 11:10

... kaolin minerals in TKL2 infill are halloysite, while 80% of them in SSR DS1 infill are kaolinite (Tables 2 and 3 in Churchman et al 2010b). By contrast, the particles of kaolin minerals in the infills ... comprising clay minerals and oxides covering other materials, including organic matter, were predominant in virgin soil but were broken down to fine clay particles that blocked pores in cultivated soils ... project including this study was carried out with the major objective of explaining the role played by kaolin-rich vein-like zones within saprolites on slopes in Hong Kong in causing or enhancing landslides,

Ngày tải lên: 13/01/2020, 19:30