CCA News & Information Articles

Dissimilatory Arsenate Reduction with Sulfide as Electron Donor: Experiments with Mono Lake Water and Isolation of Strain MLMS-1, a Chemoautotrophic Arsenate Respirer 05-01-2004 Anoxic bottom water from Mono Lake, California, can biologically reduce added arsenate without any addition of electron donors. Of the possible in situ inorganic electron donors present, only sulfide was sufficiently abundant to drive this reaction. We tested the ability of sulfide to serve as an electron donor for arsenate reduction in experiments with lake water. Equilibrium, kinetic and mass transfer studies and column operations for the removal of arsenic(III) from aqueous solutions using acid treated spent bleaching earth 09-01-2004 Abstract: In the present study, a new adsorbent was produced from spent bleaching earth by H2SO4 impregnation method. The sorption of arsenic(III) by acid treated spent bleaching earth was studied to examine the possibility of utilizing this material in water treatment systems. Accumulation of arsenic in Lemna gibba L. (duckweed) in tailing waters of two [Abstract] Accumulation of arsenic in Lemna gibba L. was investigated in tailing waters of abandoned uranium mine sites, following the hypothesis that arsenic poses contamination risks in post uranium mining in Saxony, Germany. Consequently, macrophytes growing in mine tailing waters accumulate high amounts of arsenic, which might be advantageous for biomonitoring arsenic transfer to higher trophic levels, and for phytoremediation Capacity of Lemna gibba L. (Duckweed) for uranium and arsenic phytoremediation 01-01-2004 Abstract: The potential of Lemna gibba L. to clean uranium and arsenic contamination from mine surface waters was investigated in wetlands of two former uranium mines in eastern Germany and in laboratory hydroponic culture. UO's molecular 'claws' trap arsenic atoms 11-16-2004 Discovery could eventually lead to improved treatments for arsenic poisoning EUGENE, Ore.--Chemists at the University of Oregon have hit upon a way to build a molecular "claw" that grabs onto arsenic and sequesters it. The discovery is published in the Nov. 5 issue of Angewandte Chemie International Edition, a premier journal in the field of chemistry Bacillus indicus sp. nov., an arsenic-resistant bacterium isolated Strain Sd/3T (==MTCC 4374T==DSM 15820T), an arsenic- resistant bacterium, was isolated from a sand sample obtained from an arsenic-contaminated aquifer in Chakdah district in West Bengal, India (23° 3' N 88° 35' E). The bacterium was Gram-positive, rod- shaped, non-motile, endospore-forming and yellowish-orange pigmented. Sorption materials for arsenic removal from water:; a comparative 07-01-2004 Five different sorption materials were tested in parallel for the removal of arsenic from water: activated carbon (AC), zirconium- loaded activated carbon (Zr-AC), a sorption medium with the trade name 'Absorptionsmittel 3' (AM3), zero-valent iron (Fe(0)), and iron hydroxide granulates (GIH Phytoremediation of arsenic-contaminated groundwater by the arsenic 01-01-2004 Abstract: Arsenic concentrations in a much larger fraction of U.S. groundwater sources will exceed the maximum contaminant limit when the new 10 microg L(-1) EPA standard for drinking water takes effect in 2006. Thus, it is important to develop remediation technologies that can meet this new standard Biological process of arsenic removal using selected microalgae 05-01-2004 Abstract: In the present investigation, growth of the organisms was reduced due to presence of arsenic (III) and (V) in the culture medium. In comparison to arsenic (V), arsenic (III) had more toxic effect on microalgae Dynamic arsenic removal on a MnO(2)-loaded resin. 12-01-2004 Abstract: Previous batch studies on a polystyrene matrix loaded with manganese dioxide, synthesized from an anionic commercial resin in chloride form, have proven the efficiency of this sorbent in As(V) and As(III) removal. arrA is a reliable marker for As(V) respiration. 10-15-2004 - pub med . Arsenate [As(V)]-respiring bacteria affect the speciation and mobilization of arsenic in the environment.