Distribution of uranium and radium isotopes in an aquifer of a semi-arid region (Manouba-Essijoumi, Northern Tunisia)

Added, Ayed; Mammou, Abdallah Ben; Fernex, F.; Rezzoug, S.; Bernat, M.

doi:10.1016/j.jenvrad.2005.02.010

Cited by 8 publications

(3 citation statements)

References 15 publications

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“…This is an indication that both radioisotopes are being leached to the same extent in all the mining area. In groundwaters, the observed ratios were 17.4, 192 and 2.3 for stations Added et al (2005) reported 238 U/ 226 Ra concentrations in aquifers of a semi-arid region in Tunis as high as 37.8. However, in deep aquifers the ratio dropped to 0.24 as a consequence of the development of reducing conditions.…”

Section: Radionuclide In Water Bodiesmentioning

confidence: 92%

Radioecological characterization of a uranium mining site located in a semi-arid region in Brazil

Fernandes

Lamego

Perez

et al. 2006

Journal of Environmental Radioactivity

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Section: Radionuclide In Water Bodiesmentioning

confidence: 92%

Radioecological characterization of a uranium mining site located in a semi-arid region in Brazil

Fernandes

Lamego

Perez

et al. 2006

Journal of Environmental Radioactivity

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“…The samples were collected in sterile bottles, directly transmitted and stored in ice boxes at 4°C in the laboratory in Tunis. Among the samples, we chose eco-logical niches typical of the Maghreb area, such as the Sebkhet el Sijoumi (Added et al, 2005) and Chott el Jerid (Hedi et al, 2009), which are reservoirs of salt-tolerant microorganisms.…”

Section: Collection and Preparation Of Samplesmentioning

confidence: 99%

High‐throughput isolation of giant viruses of the Mimiviridae and Marseilleviridae families in the Tunisian environment

Boughalmi

Saadi

Pagnier

et al. 2013

Environmental Microbiology

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Giant viruses of the Megavirales order have been recently isolated from aquatic environments and have long been neglected because they are removed from samples during viral purification for viral metagenomic studies. Due to bacterial overgrowth and susceptibility to high concentrations of antibiotics, isolation by amoeba co-culture has a low efficiency and is highly time-consuming. Thus, few environments have been exhaustively investigated to date, although the ubiquitous distribution of the Acanthamoeba sp. suggests that these viruses could also be ubiquitous. In this work, we have implemented a high-throughput method to detect amoebae lysis on agar plates that allows the testing of hundreds of samples in a few days. Using this procedure, a total of 11 new Marseilleviridae strains and four new Mimiviridae strains, including a virus infected with a virophage, were isolated from 1000 environmental samples from Tunisia. Of these, four corresponded to new genotypic variants. These isolates are the first African environmental isolates identified from these two families, and several samples were obtained from a hypersaline aquatic environment. These results demonstrate that this technique can be used for the evaluation and characterization of large collections of giant viruses to provide insight into understanding their ecology.

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“…Radon and radium activities in groundwater are mainly controlled by the primary uranium and thorium contents of the aquifer systems (Butler & Helena 1990; Lauria et al. 2004; Added et al. 2005).…”

Section: Introductionmentioning

confidence: 99%

Radon and radium content of some cold and thermal aquifers from Bihor County (northwestern Romania)

Roba¹,

Codrea²,

Moldovan³

et al. 2010

Geofluids

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In the present study, two of the major naturally occurring radionuclides ( 226 Ra and 222 Rn) were analyzed in water samples from shallow, medium-depth, and deep geothermal aquifers, all of which are located in Bihor County, northwestern Romania. Here, the results of radon and radium measurements, performed from 2008 to 2009 in 50 locations, are reported. Radon proved to have a wide range of activity, with values from 4.5 to 110.8 Bq l )1 for shallow aquifers, from 9.3 to 106.0 Bq l )1 for medium-depth aquifers, and from 10.1 to 34.8 Bq l )1 for deep geothermal aquifers. The shallow aquifers have lower radium concentrations (0.06 to 0.48 Bq l )1 ), compared to medium-depth aquifers (0.1 to 0.52 Bq l )1 ) and deep geothermal aquifers (0.27 to 1.8 Bq l )1 ). The principal aim was a thorough investigation into the possible correlations between the occurrence of radon and radium in different aquifers and the hydrogeological, hydrogeochemical, and geothermal features of the area. Besides the direct link between the occurrence of uranium and thorium and the 226 Ra and 222 Rn contents in groundwater, the measurements we performed have allowed us to identify a secondary control on radionuclide distributions caused by the adsorption of dissolved radium onto clay minerals in exchange for sodium (for the sandy clay aquifer of Sȃ cuieni), the high competition for adsorption sites in aquifers with high concentrations of dissolved calcium and magnesium (for the limestone dolomite aquifer of Oradea), and the role of thermal processes.

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Distribution of uranium and radium isotopes in an aquifer of a semi-arid region (Manouba-Essijoumi, Northern Tunisia)

Cited by 8 publications

References 15 publications

Radioecological characterization of a uranium mining site located in a semi-arid region in Brazil

Radioecological characterization of a uranium mining site located in a semi-arid region in Brazil

High‐throughput isolation of giant viruses of the Mimiviridae and Marseilleviridae families in the Tunisian environment

Radon and radium content of some cold and thermal aquifers from Bihor County (northwestern Romania)

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