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Automated Spectrophotometric Analyzer for Rapid Single-Point Titration of Seawater Total Alkalinity

11-09-2013 | Quanlong Li; Fengzhen Wang; Zhaohui Aleck Wang; Dongxing Yuan; Minhan Dai; Jinshun Chen; Junwei Dai; Katherine A. Ho ..., Environmental Science & Technology, 2013

An automated analyzer was developed to achieve fast, precise, and accurate measurements of seawater total alkalinity (AT) based on single-point titration and spectrophotometric pH detection. The single-point titration was carried out in a circulating loop, which allowed the titrant (hydrochloric ...

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Complexation Facilitated Reduction of Aromatic N-Oxides by Aqueous FeII–Tiron Complex: Reaction Kinetics and Mechanisms

09-09-2013 | Yiling Chen; Huichun Zhang, Environmental Science & Technology, 2013

Rapid reduction of carbadox (CDX), olaquindox and several other aromatic N-oxides were investigated in aqueous solution containing FeII and tiron. Consistent with previous work, the 1:2 FeII–tiron complex, FeL26-, is the dominant reactive species as its concentration linearly correlates with the ...

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A Natural Driven Membrane Process for Brackish and Wastewater Treatment: Photovoltaic Powered ED and FO Hybrid System

04-09-2013 | Yang Zhang; Luc Pinoy; Boudewijn Meesschaert; Bart Van der Bruggen, Environmental Science & Technology, 2013

In isolated locations, remote areas, or islands, potable water is precious because of the lack of drinking water treatment facilities and energy supply. Thus, a robust and reliable water treatment system based on natural energy is needed to reuse wastewater or to desalinate groundwater/seawater ...

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Aggregation Kinetics of Manganese Dioxide Colloids in Aqueous Solution: Influence of Humic Substances and Biomacromolecules

03-09-2013 | Xiaoliu Huangfu; Jin Jiang; Jun Ma; Yongze Liu; Jing Yang, Environmental Science & Technology, 2013

In this work, the early stage aggregation kinetics of manganese dioxide (MnO2) colloids in aqueous solution and the effects of constituents of natural organic matter (i.e., Suwannee River fulvic acid (SRFA), Suwannee River humic acid (SRHA), alginate, and bovine serum albumin (BSA)) were ...

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Multiwalled Carbon Nanotube Deposition on Model Environmental Surfaces

03-09-2013 | Xiaojun Chang; Dermont C. Bouchard, Environmental Science & Technology, 2013

Deposition of multiwalled carbon nanotubes (MWNTs) on model environmental surfaces was investigated using a quartz crystal microbalance with dissipation monitoring (QCM-D). Deposition behaviors of MWNTs on positively and negatively charged surfaces were in good agreement with ...

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Waste Plastic and Pharmaceuticals, Could an Integrated Solution Help?

29-08-2013 | Karel D. Klika, Environmental Science & Technology, 2013

Environmental Science & Technology DOI: 10.1021/es403576t

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Limits of the Linear Accumulation Regime of DGT Sensors

27-08-2013 | Sandrine Mongin; Ramiro Uribe; Carlos Rey-Castro; Joan Cecília; Josep Galceran; Jaume Puy, Environmental Science & Technology, 2013

A key question for the practical application of DGT (Diffusive Gradients in Thin films) as dynamic sensors in the environmental monitoring of trace metals is the influence of pH and dissolved ligands over the linear accumulation regime. Protons compete with metal ions for the binding to the DGT ...

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Diffusive Gradients in Thin Films Technique Equipped with a Mixed Binding Gel for Simultaneous Measurements of Dissolved Reactive Phosphorus and Dissolved Iron

27-08-2013 | Di Xu; Yifei Chen; Shiming Ding; Qin Sun; Yan Wang; Chaosheng Zhang, Environmental Science & Technology, 2013

Developing a technique to track the release of phosphorus (P) and iron (Fe) simultaneously in sediments would be very useful in deepening our understanding of the internal loading process of P coupled with Fe cycling in aquatic systems. In this study, a new technique was established to measure ...

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The •OH Radical Yield in the H2O2 + O3 (Peroxone) Reaction

21-08-2013 | Alexandra Fischbacher; Justus von Sonntag; Clemens von Sonntag; Torsten C. Schmidt, Environmental Science & Technology, 2013

The peroxone process is one of the AOPs that lead to •OH. Hitherto, it has been generally assumed that the •OH yield is unity with respect to O3 consumption. Here, experimental data are presented that suggest that it must be near 0.5. The first evidence is derived from competition experiments. ...

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Relative Reactivity of Biogenic and Chemogenic Uraninite and Biogenic Noncrystalline U(IV)

16-08-2013 | José M. Cerrato; Matthew N. Ashner; Daniel S. Alessi; Juan S. Lezama-Pacheco; Rizlan Bernier-Latmani; John R. Bargar ..., Environmental Science & Technology, 2013

Aqueous chemical extractions and X-ray absorption spectroscopy (XAS) analyses were conducted to investigate the reactivity of chemogenic uraninite, nanoparticulate biogenic uraninite, and biogenic monomeric U(IV) species. The analyses were conducted in systems containing a total U concentration ...

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