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Title: Elemental mercury: Its unique properties affect its behavior and fate in the environment

Authors:
; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1398615
Grant/Contract Number:
FG01-05EW07033; HRD-1547798
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Environmental Pollution
Additional Journal Information:
Journal Volume: 229; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-07 04:04:57; Journal ID: ISSN 0269-7491
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Gonzalez-Raymat, Hansell, Liu, Guangliang, Liriano, Carolina, Li, Yanbin, Yin, Yongguang, Shi, Jianbo, Jiang, Guibin, and Cai, Yong. Elemental mercury: Its unique properties affect its behavior and fate in the environment. United Kingdom: N. p., 2017. Web. doi:10.1016/j.envpol.2017.04.101.
Gonzalez-Raymat, Hansell, Liu, Guangliang, Liriano, Carolina, Li, Yanbin, Yin, Yongguang, Shi, Jianbo, Jiang, Guibin, & Cai, Yong. Elemental mercury: Its unique properties affect its behavior and fate in the environment. United Kingdom. doi:10.1016/j.envpol.2017.04.101.
Gonzalez-Raymat, Hansell, Liu, Guangliang, Liriano, Carolina, Li, Yanbin, Yin, Yongguang, Shi, Jianbo, Jiang, Guibin, and Cai, Yong. 2017. "Elemental mercury: Its unique properties affect its behavior and fate in the environment". United Kingdom. doi:10.1016/j.envpol.2017.04.101.
@article{osti_1398615,
title = {Elemental mercury: Its unique properties affect its behavior and fate in the environment},
author = {Gonzalez-Raymat, Hansell and Liu, Guangliang and Liriano, Carolina and Li, Yanbin and Yin, Yongguang and Shi, Jianbo and Jiang, Guibin and Cai, Yong},
abstractNote = {},
doi = {10.1016/j.envpol.2017.04.101},
journal = {Environmental Pollution},
number = C,
volume = 229,
place = {United Kingdom},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on May 31, 2018
Publisher's Accepted Manuscript

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  • The release of mercury from concrete containing fly ashes from various generator boilers and powdered activated carbon sorbent used to capture mercury was measured in laboratory experiments. Release of gaseous mercury from these concretes was less than 0.31% of the total quantity of mercury present. The observed gaseous emissions of mercury during the curing process demonstrated a dependency on the organic carbon content of the fly ash, with mercury release decreasing with increasing carbon content. Further, lower gaseous emissions of mercury were observed for concretes incorporating ash containing activated carbon sorbent than would be expected based on the observed associationmore » with organic carbon, suggesting that the powdered activated carbon more tightly binds the mercury as compared to unburned carbon in the ash. Following the initial 28-day curing interval, mercury release diminished with time. In separate leaching experiments, average mercury concentrations leached from fly ash concretes were less than 4.1 ng/L after 18 h and 7 days, demonstrating that less than 0.02% of the mercury was released during leaching. 25 refs., 4 figs., 5 tabs.« less
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  • The spectroscopic properties and dynamic behavior of peridinin in several different solvents were studied by steady-state absorption, fluorescence, and transient optical spectroscopy. The lifetime of the lowest excited singlet state of peridinin is found to be strongly dependent on solvent polarity and ranges from 7 ps in the strongly polar solvent trifluoroethanol to 172 ps in the nonpolar solvents cyclohexane and benzene. The lifetimes show no obvious correlation with solvent polarizability, and hydrogen bonding of the solvent molecules to peridinin is not an important factor in determining the dynamic behavior of the lowest excited singlet state. The wavelengths of emissionmore » maxima, the quantum yields of fluorescence, and the transient absorption spectra are also affected by the solvent environment. A model consistent with the data and supported by preliminary semiempirical calculations invokes the presence of a charge transfer state in the excited state manifold of peridinin to account for the observations. The charge transfer state most probably results from the presence of the lactone ring in the {pi}-electron conjugation of peridinin analogous to previous findings on aminocoumarins and related compounds. The behavior of peridinin reported here is highly unusual for carotenoids, which generally show little dependence of the spectral properties and lifetimes of the lowest excited singlet state on the solvent environment.« less
  • Titanium aluminide alloys, based on gamma TiAl, are currently of interest because of potential applications in high performance airframe and gas turbines. Their low densities, high melting temperatures, good elevated temperature strength and modulus retention, and environmental resistance favors them for these applications. However, their practical use are largely limited by their poor workability and ductility at temperatures lower than 700 C. Although the ductility has been improved in two phase TiAl alloys by adding alloying elements such as Cr, Mn, Nb and V, and by microstructural control in recent years, the ability to manufacture them still remains a problem.more » The reactive powder processing method offers a promising alternative to overcome this problem. This method involves cold-extrusion of an elemental powder mixture and reactive sintering. The as-extruded material can easily be machined or reformed into different shapes, since titanium aluminides are not present at this stage. The reactive sintering is conducted as the last step to form the desired titanium aluminides in the finished products. By this route, the poor workability of titanium aluminides can be avoided. In the present paper, a binary alloy Ti[sub 52]Al[sub 48](TiAl) and a ternary alloy Ti[sub 50]Al[sub 48]Cr[sub 2](TiAlCr), prepared in the same way from elemental powders, are investigated. The tensile tests were carried out at room temperature to 900 C in air. The influence of 2 at.% Cr addition on the tensile properties and fracture behavior of the alloys are reported. An emphasis is placed on the correlation between microstructure and deformation, and fracture behavior of the alloys.« less