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Iron Atom Exchange between Hematite and Aqueous Fe(II)

26-Jun-2015 | Andrew J. Frierdich; Maria Helgeson; Chengshuai Liu; Chongmin Wang; Kevin M. Rosso; Michelle M. Scherer, Environmental Science & Technology, 2015

Aqueous Fe(II) has been shown to exchange with structural Fe(III) in goethite without any significant phase transformation. It remains unclear, however, whether aqueous Fe(II) undergoes similar exchange reactions with structural Fe(III) in hematite, a ubiquitous iron oxide mineral. Here, we use ...

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Geochemical Triggers of Arsenic Mobilization during Managed Aquifer Recharge

25-Jun-2015 | Sarah Fakhreddine; Jessica Dittmar; Don Phipps; Jason Dadakis; Scott Fendorf, Environmental Science & Technology, 2015

Mobilization of arsenic and other trace metal contaminants during managed aquifer recharge (MAR) poses a challenge to maintaining local groundwater quality and to ensuring the viability of aquifer storage and recovery techniques. Arsenic release from sediments into solution has occurred during ...

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Aerobic Biotransformation of Fluorotelomer Thioether Amido Sulfonate (Lodyne) in AFFF-Amended Microcosms

23-Jun-2015 | Katie C. Harding-Marjanovic; Erika F. Houtz; Shan Yi; Jennifer A. Field; David L. Sedlak; Lisa Alvarez-Cohen, Environmental Science & Technology, 2015

The aerobic biotransformation pathways of 4:2, 6:2, and 8:2 fluorotelomer thioether amido sulfonate (FtTAoS) were characterized by determining the fate of the compounds in soil and medium microcosms amended with an aqueous film-forming foam (AFFF) solution. The biotransformation of FtTAoS ...

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Electrochemical method for wet removal of phosphine

22-Jun-2015 | Guangfei Qu, Jian Zhang, Yilu Lin, Junyan Li, Ping Ning, Yongtao Yu, Environmental Progress, 2015

The removal of phosphine (PH3) was studied with an electrochemical approach using a Ti/SnO2 anode. The effects of the current density, O2 content, gas flow rate, temperature, and type of electrolyte on the PH3 removal were investigated. The liquid phase reaction products were detected by ion ...

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IJERPH, Vol. 12, Pages 6965-6978: Comparison of Six Chromogenic Agar Media for the Isolation of a Broad Variety of Non-O157 Shigatoxin-Producing Escherichia coli (STEC) Serogroups

17-Jun-2015 | Verhaegen, Bavo ; De Reu, Koen ; Heyndrickx, Marc ; De Zutter, Lieven, International Journal of Environmental Research and Public Health, 2015

The isolation of non-O157 STEC from food samples has proved to be challenging. The selection of a suitable selective isolation agar remains problematic. The purpose of this study was to qualitatively and quantitatively evaluate six chromogenic agar media for the isolation of STEC: Tryptone Bile ...

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Formation of Light Absorbing Soluble Secondary Organics and Insoluble Polymeric Particles from the Dark Reaction of Catechol and Guaiacol with Fe(III)

15-Jun-2015 | Samantha Slikboer; Lindsay Grandy; Sandra L. Blair; Sergey A. Nizkorodov; Richard W. Smith; Hind A. Al-Abadleh, Environmental Science & Technology, 2015

Transition metals such as iron are reactive components of environmentally relevant surfaces. Here, dark reaction of Fe(III) with catechol and guaiacol was investigated in an aqueous solution at pH 3 under experimental conditions that mimic reactions in the adsorbed phase of water. Using UV–vis ...

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Equilibrium, kinetics, and thermodynamic evaluation of mercury (II) removal from aqueous solutions by moss (Homalothecium sericeum) biomass

05-Jun-2015 | Duygu Ozdes, Celal Duran, Environmental Progress, 2015

In the present research, Homalothecium Sericeum was utilized for the first time as an effective and readily available adsorbent in removal of Hg(II) ions from aqueous solutions through a batch adsorption technique. The effects of initial solution pH, contact time, initial Hg(II) and adsorbent ...

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Charge, Size, and Cellular Selectivity for Multiwall Carbon Nanotubes by Maize and Soybean

05-Jun-2015 | Guangshu Zhai; Sarah M. Gutowski; Katherine S. Walters; Bing Yan; Jerald L. Schnoor, Environmental Science & Technology, 2015

Maize (Zea mays) and soybean (Glycine max) were used as model food-chain plants to explore vegetative uptake of differently charged multiwall carbon nanotubes (MWCNTs). Three types of MWCNTs, including neutral pristine MWCNT (p-MWCNT), positively charged MWCNT-NH2, and negatively charged ...

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Modular Advanced Oxidation Process Enabled by Cathodic Hydrogen Peroxide Production

03-Jun-2015 | James M. Barazesh; Tom Hennebel; Justin T. Jasper; David L. Sedlak, Environmental Science & Technology, 2015

Hydrogen peroxide (H2O2) is frequently used in combination with ultraviolet (UV) light to treat trace organic contaminants in advanced oxidation processes (AOPs). In small-scale applications, such as wellhead and point-of-entry water treatment systems, the need to maintain a stock solution of ...

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Impact of Iron-Reducing Bacteria on the Corrosion Rate of Carbon Steel under Simulated Geological Disposal Conditions

02-Jun-2015 | Marta K. Schütz; Michel L. Schlegel; Marie Libert; Olivier Bildstein, Environmental Science & Technology, 2015

The current projects for the disposal of high-level radioactive waste rely on underground burial and confinement by metallic envelopes that are susceptible to corrosion processes. The impact of microbial activity must be fully clarified in order to provide biological parameters for predictive ...

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