Simplified alpha-spectroscopic analysis of uranium in natural waters after its separation by cation-exchange

Kiliari, Tasoula; Pashalidis, Ioannis

doi:10.1016/j.radmeas.2010.06.024

Cited by 55 publications

(26 citation statements)

References 4 publications

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“…A number of studies have been carried out in different parts of the world to study the occurrence of U in waters (Chau and Michalec 2009;De Camargo and Mazzilli 1996;Killiari and Pashalidis 2010) and to evaluate its chemical and radioactive toxicities. In 2012, the World Health Organization (WHO) proposed a provisional guideline of 30 lg l -1 for U, which was based on its chemical toxicity.…”

Section: Introductionmentioning

confidence: 99%

Lithological and hydrochemical controls on distribution and speciation of uranium in groundwaters of hard-rock granitic aquifers of Madurai District, Tamil Nadu (India)

Thivya

Chidambaram

Keesari

et al. 2015

Environ Geochem Health

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Uranium is a radioactive element normally present in hexavalent form as U(VI) in solution and elevated levels in drinking water cause health hazards. Representative groundwater samples were collected from different litho-units in this region and were analyzed for total U and major and minor ions. Results indicate that the highest U concentration (113 µg l(-1)) was found in granitic terrains of this region and about 10 % of the samples exceed the permissible limit for drinking water. Among different species of U in aqueous media, carbonate complexes [UO2(CO3)(2)(2-)] are found to be dominant. Groundwater with higher U has higher pCO2 values, indicating weathering by bicarbonate ions resulting in preferential mobilization of U in groundwater. The major minerals uraninite and coffinite were found to be supersaturated and are likely to control the distribution of U in the study area. Nature of U in groundwater, the effects of lithology on hydrochemistry and factors controlling its distribution in hard rock aquifers of Madurai district are highlighted in this paper.

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Section: Introductionmentioning

confidence: 99%

Lithological and hydrochemical controls on distribution and speciation of uranium in groundwaters of hard-rock granitic aquifers of Madurai District, Tamil Nadu (India)

Thivya

Chidambaram

Keesari

et al. 2015

Environ Geochem Health

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“…Method calibration using cation-exchange separation results in efficiency of 85%. The electrodeposition of uranium on stainless steel discs produced results within excellent yields, generally over 99% (Pashalidis and Tsertos, 2004;Killiari and Pashalidis, 2010). The Minimum Detectable Activity (MDA) reached in the measurements was estimated to be about 1 mBq l L1 at the 95% confidence limit.…”

Section: A-spectroscopymentioning

confidence: 92%

“…The employment of high-resolution a-spectroscopy allows an accurate determination of the activity of the 238 U and 234 U radioisotopes. Generally, 500 ml of each groundwater sample were pre-treated by cation-exchange as described elsewhere (Pashalidis and Tsertos, 2004;Killiari and Pashalidis, 2010). This pre-analytical procedure, which is selective for uranium (Killiari and Pashalidis, 2012), was carried out in parallel for every sample.…”

Section: A-spectroscopymentioning

confidence: 99%

Uranium levels in Cypriot groundwater samples determined by ICP-MS and α-spectroscopy

Charalambous

Aletrari

Piera

et al. 2013

Journal of Environmental Radioactivity

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“…500 ml of each groundwater sample was pre-treated by cation-exchange using Chelex 100 as described elsewhere [2]. This pre-analytical procedure is selective for uranium and was carried out in parallel for every sample.…”

Section: Instrumentation and Analysismentioning

confidence: 99%

Determination of uranium concentration in ground water samples of Northern Greece

Samaropoulos

Efstathiou

Pashalidis

et al. 2012

EPJ Web of Conferences

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The activity concentration of 238 U and 234 U has been determined in groundwater samples of hot springs and deep wells from the region of Northern Greece. The analysis was performed by alpha spectroscopy after pre-concentration and separation of uranium by cation exchange (Chelex 100 resin) and finally its electro-deposition on stainless steel discs. The uranium concentration in deep wells and springs varies strongly between 0.15 and 7.66 μg l −1 . Generally the springs present higher uranium concentration than the deep wells, except of the Apollonia spring, which has shown the lowest value of 0.15 mg l −1 . 238 U and 234 U activity concentration ranged between 1.8-95.3 mBq l −1 and 1.7-160.1 mBq l −1 , respectively. The obtained isotopic ratio 234 U/ 238 U varies between 0.95 and 1.74 which means that the two isotopes are not in radioactive equilibrium. The highest 234 U/ 238 U activity ratio values correspond to the Langada springs, indicating most probably old-type waters. On the other hand, ground waters from wells with relatively low uranium activity concentration and low 234 U/ 238 U isotopic ratios, point to the presence of younger waters with a stronger contribution of a local recharge component to the groundwater. *

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Simplified alpha-spectroscopic analysis of uranium in natural waters after its separation by cation-exchange

Cited by 55 publications

References 4 publications

Lithological and hydrochemical controls on distribution and speciation of uranium in groundwaters of hard-rock granitic aquifers of Madurai District, Tamil Nadu (India)

Lithological and hydrochemical controls on distribution and speciation of uranium in groundwaters of hard-rock granitic aquifers of Madurai District, Tamil Nadu (India)

Uranium levels in Cypriot groundwater samples determined by ICP-MS and α-spectroscopy

Determination of uranium concentration in ground water samples of Northern Greece

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