arsenic antimony and bismuth
Arsenic solubility and distribution in poultry waste and long term amended soil
... surface and groundwater via runoff and leaching Several studies have documented As speciation and toxicity in soils (Onken and Hossner, 1995; Cox et al., 1996a) The bioavailability, toxicity and ... 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 fraction (-0.2 ... 0.7 46.5 15.9 19.3 12.2 1.0 a b Mean of five samples and standard error From Ref Curtis (1998) sissippi between 1997 and 2000 (Table 2) In 1999 and 2000, multiple, composite waste samples were collected...
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Arsenic speciation and distribution in an arsenic hyperaccumulating plant
... Uptake, accumulation and translocation of arsenic in both arsenic- tolerant and non-tolerant plants have been studied although those plants are not arsenic hyperaccumulators (Meharg and Mac¨ nair, 1990, ... results from these studies Experimental 2.1 Reagents and standards The inorganic arsenic standard and other individual stock solutions of internal standards used for inductively coupled plasma mass ... species (e.g Wells and Richardson, 1985; Macnair and Cumbes, 1987; Meharg and Macnair, 1990, 1991a) It has been reported that in both arsenic tolerant and nontolerant Holcus lanatus L., arsenic uptake...
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arsenic contamination in soils, water and plants
... 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, it causes leading ... kilometer from the mine and at the altitude of 276 meters from the mean sea level Most of lands were engaged in farming and cropping plants such as corns, tapiocas, soybean, and rubber trees Within ... dilution, and final measurement Since this technique related to analytical chemistry and spectrometry, more details of this method can be found in Bailey et al, (2003) RESULTS AND DISCUSSION • Arsenic...
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ARSENIC POLLUTION IN SOIL AND GROUNDWATER OF BANGLADESH
... CONCLUSION AND RECOMMENDATIONS Priority should be given to the following points for the mitigation of arsenic problem in Bangladesh and give people access to arsenic free water a) Arsenic affected ... the analysis of soil and water samples related to Arsenic problem is very important d) Essential to findout the exact and possible sources of arsenic in the groundwater in the arsenic affected areas ... sedimentation, provenance and tectonics Geo.Soc Am Paper, 284,21-40 Nesbitt, H.W Fedo, C M and Young, G.M.(1997) Qyartz and feldspar stability, steady and non-sready state weathering, and petrogenesis...
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Removal of arsenic from synthetic groundwater by adsorption using the combination of laterite and ironmodified activated carbon
... arsenic concentration and inlet flow rate The samples taken were acidified and analyzed for residual arsenic concentration A mixture of 70% As[III] and 30% As[V] was used in all experiments and ... is arsenic adsorption capacity of adsorbent, (mg/g); and CA is concentration of arsenic molecule in the solution, mg/L At equilibrium, from equation (3) dq/dt = 0; q = q e and CA = CA,e,, and ... AC, LA, and AC-Fe and Figure illustrates the comparison of LA-AC and LA-AC-Fe These figures indicated that the combination of LA and AC-Fe is the most feasible - 50 - Journal of Water and Environment...
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Effect of Calcium and Magnesium Addition on Arsenic Leaching from Paddy Field Soil of Bangladesh
... < 11.5 and might form at pH 12 and 12.5 Leachate pH obtained ranged between 7.0 and 8.0 which might not support the first hypothesis On the other hand, adsorption of Ca and Mg from GW and subsequent ... Other Conditions 0.9 Effect of P and 100 and 2.0 pH adjusted to 3.0, 5.0, 7.0, 9.0 and 11.0 pH 7.0 Leaching in anaerobic incubation and 100 0.9 Effect of Ca and Mg concentrations Effect of pH ... the adsorbed amount of Ca and Mg with different additions of Ca and Mg Results indicated that Ca and Mg adsorption increased with the increase in Ca and Mg addition and the amount adsorbed increased...
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Arsenic and membrane toxicity
... tế bào với arsenic Tế bào hấp thu arsenic Sự hấp thu arsenic tế bào HPLC, NMR, SDS page Vò trí arsenic trên/trong tế bào (membrane, intracellular…) Không hấp thu Được tổng hợp Tổng arsenic giữ ... • Arsenic tác động vò trí nào…màng tế bào? Arsenic tác động vào trình đồng hóa glucose Các vò trí đánh dấu Toxicology and Applied Pharmacology 197 (2004) 67– 83 F.S Walton et al / Toxicology and ... tính arsenic Chức bảo vệ màng tế bào yếu dẫn đến công mạnh mẽ yếu tố khác Relative fluorescent intensity [a.u] Arsenic hóa lỏng màng tế bào 0.35 0.30 With arsenic 0.25 0.20 0.15 0.10 Without arsenic...
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Tài liệu Báo cáo "Arsenic removal from water by magnetic Fe1-xCoxFe2O4 and Fe1-yNiyFe2O4 nanoparticles " pptx
... http://www.epa.gov/safewater /arsenic [2] M Bissen, F.H Frimmel, Arsenic A review Part I: Occurrence, toxicity, speciation, mobility, Acta Hydroch Hydrob 31 (2003) [3] L.C.D Anderson, K.W Bruland, Biogeochemistry of arsenic ... chronic arsenicism in Taiwan, J Nat Cancer Inst 40 (1968) 453 [5] L.G Twidwell, J McCloskey, P Miranda, M Gale, Technologies and potential technologies for removing arsenic from process and mine ... Co- and Ni-ferrites linearly reduces with x and y Figure presents the saturation magnetization as a function of Co and Ni content A linear dependence was found in the samples with the Co and...
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Báo cáo " Preparation of nano-structural MnO2 in ethanol-water media coated on calcinated laterite and study of its arsenic adsorption capacity " docx
... Sciences and Technology 24 (2008) 227-232 C aq Cs = C aq + b.C m C m where Caq and Cs is arsenic equilibration concentration in liquid and solid phase respectively; Cm is maximum concentration of arsenic ... competition of hydration and solvation and for long chain molecule solvent, there appeared net-like of solvent molecules in water solution; that hampered molecules and ions association and crystals growing ... 173 [2] Ashutish Pandey, Anjana Pandey, Mukesh Kumar, H C Verna, Sol-gel Synthesis and characterization of Eu+++/Y2O3 nanophosphorus by an alkoxide precursor, Materials Chemistry and Physics 96...
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Blank values, adsorption, pre concentration, and sample preservation for arsenic speciation of environme
... temperatures and different pre-concentration ratios (see Figs and 8) As(III) and AsC always had the lowest recoveries among the arsenic compounds and under all conditions tested In contrast, As(V) and ... using germanium (10 g Ge l−1 ) as an internal standard Detection limits for arsenic species and the total arsenic were calculated as three times the standard deviation from instrumental blank values ... and river water The concentrations of total arsenic in these water samples were all below g As l−1 with the dominance of inorganic arsenic, As(III), and As(V) Remarkable amounts of organic arsenic...
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Comparision between background concentration of arsenic in urban and non urban areas of florida
... compare arsenic background concentrations in urban and nonurban soils in Florida, and (ii) investigate the relationship between arsenic background concentrations and the extent of human activity and ... concentrations and soil properties (total Fe, total Al, pH, clay, OC, and cation exchange capacity (CEC)) of both the urban and non-urban soils were conducted in this study The correlation between pH and arsenic ... concentrations and OC and the siltqclay content of the soil (Aloupi and Angelidis, 2001; Chirenje, 2000; Wilcke et al., 1998) There was significant (as0.05) correlation between arsenic concentrations and...
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Arsenic speciation in environmental and biological samples extraction and stability studies
... (2003) 85–98 total arsenic determination and for total As species characterization and/ or validation Procedures 3.1 Mineralization for total arsenic determination 3.1.1 Fish, rice and chicken samples ... 1:1–9:1) and M H3 PO4 (only for soil samples) Table shows the total arsenic content found in rice, chicken, fish and soil, after acid digestion of raw samples and determination by HG-AFS, and the ... presence of borohydride The arsenic content in rice and chicken is of the same order of magnitude and about three and two orders of magnitude lower than that of soil and fish, respectively The 9:1...
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Arsenic transformations in the soil rhizosphere plant system fundamental and potential application to ph
... 10, Meharg and Macnair (1990); 11, De Koe and Jaques (1993); 12, Jiang and Singh (1994); 13, Jacobs and Keeney (1970); 14, Woolson (1972); 15, Small and McCants (1962); 16, Creger and Peryea ... as Lupinus albus and members of the Protaceae exude particularly strong organic acids and phenolics (Dinkelaker et al., 1995) Arsenic and P belong to the same chemical group and have comparable ... shoots and roots of both tolerant and non-tolerant clones of Holcus lanatus Jacobs and Keeney (1970) compared As accumulation in corn from artificially contaminated soils (20 and 80 mg kg(1) Arsenic...
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Effects of compost and phosphate amendments on arsenic mobility in soils and arsenic uptake by the hyper
... of Fe–As and Ca–As, but increased water-soluble and exchangeable As (WE–As) and 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 ... 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 identify possible ... produce volatile arsenicals by a reductive pathway from inorganic and methylated forms of As (Onken and Adriano, 1997) Akins and Lewis (1976) added DSMA-74As to a soil system and measured a loss...
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Geochemistry of inorganic arsenic and selenium in a tropical soil effect of reaction time, ph, and comp
... in aqueous and subsurface systems, namely )2, 0, +4, and +6 The fate and transport of Se in contaminated sites are very much influenced by its chemical form and speciation Selenite and Se(VI) ... 1994; Carbonell Barrachina et al., 1996; Lo and Chen, 1997; Su and Suarez, 2000; O’Reilly et al., 2001), and oxidation states of As and Se Competitive ions and soil properties are also being emphasized ... (Faust and Aly, 1999) Hence, at pH 4.7, H3 AsO0 and H2 AsOÀ are the respective predominant dissolved As(III) and As(V) species While HSeOÀ and SeO2À are the predominant dissolved Se(IV) and Se(VI)...
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thermomechanical and thermal contact characteristics of bismuth telluride films electrodeposited on carbon nanotube arrays
... for Si (2.6 Â 10À6 KÀ1 [10]) and Bi2Te3 (13.0 Â 10À6 KÀ1 [11]), the theoretical stress-free lateral displacement between the TE film and the substrate was calculated and is also indicated in Table ... Sands, Appl Phys Lett 2008, 92, 013133-1-3 [8] A Ioffe, Semiconductor Thermoelements and Thermoelectric Cooling, Infosearch, London 1958 [9] M S Martin-Gonzalez, A L Prieto, R Gronsky, T D Sands, ... films were visually analyzed for deposited directly on a silicon substrate and another grown on signs of cracks or peeling, and the observations are presented in CNT array The X-ray diffraction patterns...
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báo cáo hóa học:" Crystal structure and electrical properties of bismuth sodium titanate zirconate ceramics" pdf
... Metal and Materials Technology Center (MTEC), Nation Science and Technology Development Agency (NSTDA), Thailand Research Fund (TRF), and the National Research University Project under Thailand’s ... zirconate experiment and analysis and drafted the manuscript PJ participated as the assistant for the research experiment AW and SJ participated in the conception and design of the study and revised the ... effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides Acta Cryst 1976, A32:751-767 15 Lily Kumari K, Prasad K, Yadav KL: Dielectric and impedance study...
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báo cáo hóa học:" Adsorption and desorption characteristics of arsenic onto ceria nanoparticles Nanoscale Researc" pptx
... when the task was to speciate arsenic( III) and arsenic( V) Arsenic( V) was determined by the difference between total inorganic arsenic and arsenic( III) Results and discussion Characterization ... of ionic strength on the adsorption of arsenic( III) and arsenic( V) onto the surfaces of ceria NPs were presented in Figure The amount of arsenic( III) and arsenic( V) adsorbed by ceria NPs was stable ... adsorption of arsenic( V) and arsenic( III) by ceria NPs which resulted from an inner sphere complex formation between arsenic and the surface of ceria NPs The strong pH dependence and ionic strength...
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Báo cáo hóa học: " Synthesis and Electrochemical Sensing Toward Heavy Metals of Bunch-like Bismuth Nanostructures" doc
... Preparation and Analytical Procedure A potential of -1.5 V was applied between cathode and anode The pulse time was 0.4 ms and the time between pulses was 0.8 ms After deposition of 40 min, the nano bismuth ... situ prepared bismuth film electrodes (BiFEs) and the bunch-like bismuth under the same conditions, it is observed that anodic peak current of the heavy metals at the bunch-like bismuth electrode ... neighboring nanowires had their ends assembled and knitted together from different orientations, forming the bunches and the nests of the bunch-like bismuth microstructure The growth of these Bi...
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