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In present work, the fate of arsenic was discussed based on quantitative analysis of aqueous and solid arsenic and iron, and qualitative characterization using X-ray absorption near edge spectroscopy (XANES). It is proposed from XANES evidence that orpiment-like mineral is the major As sulfide phase precipitated. This indicates that the arsenic in offshore sediment has undergone a transformation process from oxyhy...

Cadmium (Cd), as a highly mobile and toxic trace element, has been exerting a great pressure on environmental safety due to its increasingly higher input flux from anthropogenic sources. Appropriate remediation technologies for the contaminated environments become necessary. It is known that the fate of Cd is controlled by its sorption reactions and speciation in the environment. Therefore much attention has been ...

The local structure of aqueous metal ions on solid surfaces is central to understanding many chemical and biological processes in soil and aquatic environments. Differences in surface coordination structure may greatly affect the local chemical properties, long-range interactions, surface reactivity, and bioavailability of metal ions in the aquatic environment. Conclusive diagnosis of the surface coordination stru...

Magnetite (Fe3O4) nanoparticles have shown great potential for sorption of arsenic in contaminated soil and water because of the small particle size, large specific surface area, and high sorption capacity and affinity. To prevent nanoparticles from aggregating, and thus, to enhance sorption capacity and soil deliverability, starch has been chosen to act as a stabilizer in preparation of the Fe3O4 particles. Howev...

The modulation and demodulation technique is the base of radio broadcast, as well as the information transmission and communication of modern computers. In physics, the modulation method has been applied to study the spectroscopy of semiconductors since the 1960s. Modulation spectrum, which is to measure small changes of sample under the periodic perturbation of external fields, can substantially increase the cont...

In his Nobel Prize lecture, Odd Hassel particularly referred that there are Cl···N charge-transfer interactions which was widely studied by scientists later in cyanuric chloride crystals. As can be seen in figure 1, the molecules of C3N3Cl3 are forming planar layers parallel to the ab-plane. Within the layers, each molecule is linked to six neighbor molecules by halogen bonds. Owing to its outstanding structure...
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