arsenic Articles
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Bioaccumulation and oxidative stress in Daphnia magna exposed to arsenite and arsenate
Arsenic pollution and its toxicity to aquatic organisms have attracted worldwide attention. The bioavailability and toxicity of arsenic are highly related to its speciation. The present study investigated the differences in bioaccumulation and oxidative stress responses in an aquatic organism, Daphnia magna, induced by 2 inorganic arsenic species (As(III) and As(V)). The bioaccumulation of ...
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Lummi Island, Washington - Arsenic, Iron, Sulfide Treatment System
In mid 2004, AdEdge Technologies Inc. (AdEdge) was selected by Miller Water Association and Anvil Corporation to assist in the design of a fullscale arsenic treatment project for this small community. Arsenic levels are alarmingly high at 0.18 mg/l, 18 times higher than the new Federal standard of 0.010 mg/l. In addition to arsenic, many of the homeowners using the water objected to the ...
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Tracking of arsenics during the thermal stabilization of an AsH3 scrubber sludge
Toxic arsenics in an AsH3 scrubber sludge were thermally stabilized in the temperature range of 973–1,373 K. To better understand how the high-temperature treatments can stabilize arsenics in the sludge, their synchrotron X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectra of arsenics were determined. It is found that the reduced ...
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Campbell Ranch, Nevada Arsenic & Uranium Treatment - Case Study
Campbell Ranch, Nevada Arsenic & Uranium Treatment In March 2009, AdEdge Water Technologies was contacted by Indian Health Services to design, manufacture, and start up an arsenic and uranium treatment system for the Campbell Ranch community in Nevada. Arsenic concentrations were approximately 0.023 mg/L and uranium concentrations were 0.047 mg/L, well above the United States Environmental ...
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Impact of Carbon Nanotubes on the Toxicity of Inorganic Arsenic [As(III) and As(V)] to Daphnia magna: The Role of the Certain Arsenic Species
As a kind of emerging nanomaterials, hydroxylated multi‐walled carbon nanotubes (OH‐MWCNTs) may interact with other pollutants in the aquatic environments and further influence the toxicity, transport and fate of them. So, evaluation of toxicity to arsenic in present of CNTs needs to receive much more attention. Current experiments were conducted to explore the underlying mechanisms for the ...
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Desorption kinetics and leaching study of arsenic from arsenite/arsenate-loaded Natural Laterite
Desorption kinetics of arsenite- and arsenate-loaded Natural Laterite (NL) is performed under varying NaOH concentration (0.05-0.3 mol/L) and pH (4.0-11.0) of the desorption medium. The kinetic desorption data are well fitted to pseudo-second order kinetic model. The leaching of NL under aqueous medium is performed in the pH range of 2-12. Separately arsenite- and arsenate-loaded NL is leached ...
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Accumulation kinetics of arsenic in Daphnia magna under different phosphorus and food density regimes
In the present study, the dissolved uptake, dietary assimilation, and elimination of arsenic (initially added as arsenate) in the freshwater cladoceran Daphnia magna were examined. A biphasic correlation between the arsenic uptake rate and its ambient concentration, as well as a two–saturation‐site arsenic uptake competition with phosphate was observed. The calculated uptake rate constant, as ...
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Campbell Ranch, Nevada - Case Study
In March 2009, AdEdge Water Technologies was contacted by Indian Health Services to design, manufacture, and start up an arsenic and uranium treatment system for the Campbell Ranch community in Nevada. Arsenic concentrations were approximately 0.023 mg/L and uranium concentrations were 0.047 mg/L, well above the United States Environmental Protection Agencys maximum contaminant levels of 0.01 ...
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Arsenic Treatment Project Pueblo of Isleta, New Mexico - Adedge Technologies, Inc.
In August, 2004, following successful field piloting, AdEdge Technologies, Inc. (AdEdge) was selected by the Pueblo of Isleta, located south of Albuquerque, New Mexico, to provide a turnkey project for furnishing an arsenic treatment system, installation, startup, and commissioning to bring the casino water system into compliance with the new maximumcontaminant level (MCL) for arsenic. The Isleta ...
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Arsenic Treatment Project - Pueblo of Isleta, New Mexico
In August, 2004, following successful field piloting, AdEdge Technologies, Inc. (AdEdge) was selected by the Pueblo of Isleta, located south of Albuquerque, New Mexico, to provide a turnkey project for furnishing an arsenic treatment system, installation, startup, and commissioning to bring the casino water system into compliance with the new maximum contaminant level (MCL) for arsenic. The ...
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Executive Summary of Arsenic Contamination in the World
Annex 1 is an ancillary summary database which provides supplementary material to Table 1 in the Executive Summary of Murcott: Arsenic Contamination in the World: An International Sourcebook. Table 1 is entitled Arsenic Contamination in the World and summarizes the exposed populations, the current arsenic standards and the sources of arsenic for each of the 105 identified countries, by ...
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A Pilot Survey of In-Service Home Arsenic Tracked in from Chromated Copper Arsenate–Treated Decks
Arsenic is a known carcinogen. It is also known to be readily dislodgeable from chromated copper arsenate (CCA)–treated lumber. The floors of in-service homes were tested for inorganic arsenic using a wipe method similar to the U.S. Housing and Urban Development (HUD) method for lead dust clearance sampling. Additionally, a hand-sampling method was used that involved direct dermal contact with ...
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Effect of co-existing copper and calcium on the removal of As(V) by reused aluminum oxides
Among the various heavy metals, arsenic is frequently found in abandoned mine drainage and the environmental fate of arsenic in real aqueous solutions can be highly dependent on the presence of co-existing ions. In this study, removal of arsenate through adsorption on the reused aluminum oxide or through precipitation was investigated in a single and in a binary system as a function of pH and ...
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A critical review of the separation of arsenic oxyanions from dilute aqueous solution (the contribution of LGICT)
This paper presents an overview of research related to the effective removal (by sorption and/or flotation) of arsenates and arsenites from aqueous effluents, as exerted in depth at GICT Laboratory of Chemistry Department in Aristotle University during the last decade. This paper presents, compares and comments the results of more than 20 scientific papers. Equilibrium, thermodynamic and kinetic ...
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The IRIS Assessment of Inorganic Arsenic: Is Science Being Hijacked?
The arsenic Integrated Risk Information System (IRIS) assessment exemplifies the current administration’s unwillingness to walk its own talk on transparency and scientific ...
By Acta Group
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The binding of metal ions to molecularly-imprinted polymers
Imprinting polymerization is a flexible method to make resins specific for different compounds. Imprinting polymerization involves the polymerization of the resin in the presence of a template, here cadmium ions or arsenate. The template is then removed by washing, leaving specific binding sites in the resin. In water treatment, the removal of toxic metal ions is difficult due to the limited ...
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Arsenic removal using novel combined Fe/Mn adsorbent modified with silica
Arsenic pollution has become a dominant environmental concern in recent years. Various techniques for arsenic removal from water have been developed. However, these techniques efficiently remove arsenic from drinking water but require toxic and expensive chemicals and generate a large amount of exhaust sludge, which is not always regenerable. In this study a novel Fe-Mn-Si oxide material was ...
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Pteris multifida Poir., a new arsenic hyperaccumulator: characteristics and potential
This paper reports a new arsenic hyperaccumulator, Pteris multifida Poir, a fern that grows widely in the southeast of China. The results show that the average arsenic content in the fronds was 1144.78 mg/kg, with a highest value of 2061 mg/kg. The average arsenic content in the roots was 692.7 mg/kg, and the average bioconcentration factor was 1.2, with a highest value of 1.78. The average ...
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Distribution of iron in activated carbon composites: assessment of arsenic removal behavior
The main objectives of this study were to evaluate the effectiveness of using iron impregnated granular activated carbon (AC) to remove arsenic from water and to assess the partitioning behavior of arsenic under a variety of conditions. Iron impregnated granular activated carbon (AC-Fe) composites were prepared with different ferric (Fe+3) concentrations, ranging from 0.09 to 3.0 M. These ...
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EPA Arsenic - Demonstration Projects
AdEdge Technologies, Inc. was selected by USEPA through an expert peer review process in cooperation with the individual host sites to conduct full scale arsenic treatment demonstrations using its Granular Ferrric Oxide Adsorption Technology. The program is designed to gather further cost and performance data on commercially available, proven technologies which are candidates to become Best ...
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