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Abstract  

This study aims to find out a vascular plant species that accumulate relatively high concentrations of arsenic (As) for its use as phytoremediator at abandoned and contaminated mining areas, such as São Domingos mines (Portugal). The assessment of As contamination levels in soils and plants of other similar sites in the north of the country (Castromil and Poço de Freitas) was also conducted; and the sample analyses were made by instrumental neutron activation analysis. Agrostis genera have shown higher As transfer coefficients than other studied plant species and, in particular, Agrostis curtisii has shown a reasonable ability to accumulate high concentration of this toxic element.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: M. Freitas, A. Pacheco, H. Anawar, I. Dionísio, H. Dung, N. Canha, A. Bettencourt, F. Henriques, C. Pinto-Gomes, and S. Capelo

Abstract  

This study has determined contamination levels in soils and plants from the São Domingos mining area, Portugal, by k 0-INAA. Total concentrations of As, Sb, Cr, Hg, Cu, Zn and Fe in soils were very high, exceeding the maximum limits in Portuguese legislation. Concentrations of toxic elements like As, Sb and Zn were highest in roots of Erica andevalensis, Juncus acutus, Agrostis castellana and Nicotiana glauca. Additionally, As, Br, Cr, Fe, Sb and Zn in all organs of most plants were above toxicity levels. Those species that accumulated relatively high concentrations of toxic elements in roots (and tops) may be cultivated for phytostabilisation of similar areas.

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Journal of Thermal Analysis and Calorimetry
Authors: Yuri Park, Godwin A. Ayoko, Janos Kristof, Erzsébet Horváth, and Ray L. Frost

Abstract

In this study, mono- and di-alkyl cationic surfactants were used to prepare organoclays through ion exchange and the prepared organoclays were characterised by X-ray diffraction (XRD) and thermogravimetric analysis (TG). Larger basal spacings were observed in the interlayer of the organoclays intercalated with DDDMA than organoclays intercalated with DDTMA. The DTG curves identify the thermal stability of organoclays intercalated with two different types of surfactants (DDTMA and DDDMA) and the different arrangements of the surfactant molecules intercalated in the montmorillonite. Both organoclays intercalated with organic surfactant molecules proved to be thermally stable at high temperature. This study provides an understanding of the structure and properties of organoclays, which will enhance the potential applications of organoclays in environmental remediation.

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Abstract  

A number of nuclear technologies developed and applied at the Savannah River Site in support of nuclear weapons material production and environmental remediation can be applied to problems in law enforcement. Techniques and equipment for high-sensitivity analyses of samples are available to identify and quantify trace elements and establish origins and histories of forensic evidence removed from crime scenes. While some of these capabilities are available at local crime laboratories, state-of-the-art equipment and breakthroughs in analytical techniques are continually being developed at DOE laboratories. Extensive experience with the handling of radioactive samples at the DOE labs minimizes the chances of cross-contamination of evidence received from law enforcement. In addition to high-sensitivity analyses, many of the field techniques developed for use in a nuclear facility can assist law enforcement personnel in detecting illicit materials and operations, in retrieving of pertinent evidence and in surveying crime scenes. Some of these tools include chemical sniffers, hand-held detectors, thermal imaging, etc. In addition, mobile laboratories can be deployed to a crime scene to provide field screening of potential evidence. A variety of portable sensors can be deployed on vehicle, aerial, surface or submersible platforms to assist in the location of pertinent evidence or illicit operations. Several specific nuclear technologies available to law enforcement and their potential uses are discussed.

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their production ,” in Activated Carbon Surfaces in Environmental Remediation , T. J. Bandosz , ed., Ser. Interface Science and Technology , vol. 7 , Elsevier , 2006 , pp. 1 – 47 . 10.1016/S1573-4285(06)80010-4 [11] J. Edzwald , Water Quality

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Introduction Photocatalytic oxidation using semiconductors as photocatalysts represents an excellent technology for environmental remediation. In particular, photocatalytic oxidation based on TiO 2 has been demonstrated to be

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environmental remediation . J Colloid Interface Sci 316 : 298 – 309 10.1016/j.jcis.2007.07.078 . 16. Świątkowski , A , Padee , A 2007 Possibility of preparation of activated carbons from poly

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Journal of Thermal Analysis and Calorimetry
Authors: Eunice F. S. Vieira, Antonio R. Cestari, Wagner A. Carvalho, Cíntia dos S. Oliveira, and Renata A. Chagas

environmental remediation technologies. Due to ability to remove different types of dye, easy handling and produce high quality treated water, the adsorption technique has already received considerable attention and several adsorbents have been developed for

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Journal of Thermal Analysis and Calorimetry
Authors: Rabia Nazir, Muhammad Mazhar, Tehmina Wakeel, Muhammad J. Akhtar, Muhammad Siddique, Muhammad Nadeem, Nawazish A. Khan, and Muhammad R. Shah

. Zhang , D , Wei , S , Kaila , C , Su , X , Wu , J , Karki , AB , Young , DP , Guo , Z . 2010 . Carbon-stabilized iron nanoparticles for environmental remediation . Nanoscale . 2 : 917 – 919 10.1039/c0nr00065e

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