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Iordache I.,Institute for Cryogenics and Isotopic Technologies | Wilson S.,University of Oslo | Lundanes E.,University of Oslo | Iordache M.,Institute for Industrial Ecology ECOIND | And 2 more authors.
Environmental Engineering and Management Journal | Year: 2010

In this study, the authors explore the potential of ultrasound and wet catalyzed peroxide oxidation into the wastewater treatment processes. The processes applied for degradation of pesticides were carried out using Fenton reagent and sonochemical treatment. The Fenton and the sono-Fenton decomposition of 2,4-dichlorophenoxyacetic acid (2,4 D), 4-(2,4-dichlorophenoxy)butyric acid (2,4 DB), 4-chloro-o-tolyoxyacetic acid (MCPA), 3,5-dibromo-4- hidroxybenzonitrile (bromoxynil), and 3-(4-chlorophenyl)-1,1-dimethylurea (monuron) showed that, in all cases ultrasound irradiation of wastewater improved the wet oxidation process. Source


Varlam C.,Institute for Cryogenics and Isotopic Technologies | Stefanescu I.,Institute for Cryogenics and Isotopic Technologies | Cuna S.,Romanian Institute of Isotopic And Molecular Technology | Vagner I.,Institute for Cryogenics and Isotopic Technologies | And 2 more authors.
Radiocarbon | Year: 2010

The Lower Danube Basin covers the Romanian-Bulgarian sub-basin downstream from Cazane Gorge and the sub-basins of the Siret and Prut rivers. To extensively survey the Romanian nuclear power plant impact on the Danube water, tritium and radiocarbon baseline values are required. Therefore, the reported study tried to establish these values based on a 2-yr sampling campaign covering 975 km of the Danube from Cazane Gorge to Tulcea. The tributaries Cerna, Jiu, Olt, and Arges were also included in this study. During the sampling campaigns, tritium concentration of different sampling locations showed values between 7 ± 2.1 and 33.5 ± 2.3 TU. Measured 14C activity for the same locations ranged between 88.45 ± 1.46 and 112.36 ± 1.56 pMC. Lower values were recorded for tributaries: between 8.3 ± 2.1 and 12.2 ± 2.2 TU for tritium and between 67.3 ± 1.29 and 86.04 ± 1.42 pMC for 14C. Despite the nuclear activity in the observed areas, tritium and 14C activities presented slightly higher values for specific locations without any influence on Danube River water. © 2010 by the Arizona Board of Regents on behalf of the University of Arizona. Source


Faurescu I.,Institute for Cryogenics and Isotopic Technologies | Varlam C.,Institute for Cryogenics and Isotopic Technologies | Stefanescu I.,Institute for Cryogenics and Isotopic Technologies | Cuna S.,Romanian Institute of Isotopic And Molecular Technology | And 3 more authors.
Radiocarbon | Year: 2010

In this paper, we investigate a procedure for radiocarbon determination in forest soil and slurry from lake sediments. The total carbon in these samples can be both inorganic and organic. Inorganic carbon can be analyzed in a straightforward manner using the direct absorption method by sample acidification and CO2 capture. For organic carbon, we investigate a hybrid method using the wet-oxidation of organic carbon followed by direct absorption. To evaluate the wet-oxidation processes with potassium dichromate (K2Cr2O7) and potassium permanganate (KMnO4), we performed several experiments using different quantities of soil and sediments in order to establish the quantity of CO2 for each type of sample. The 2 methods offer comparable results for 14C-specific activity (about 0.234 ± 0.024 Bq/g C), values that are expected for these kinds of samples. We also investigated the possibility of isotopic fractionation occurring during CO2 production from raw material by measuring δ13C levels from samples and obtained CO2. © 2010 by the Arizona Board of Regents on behalf of the University of Arizona. Source

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