Authors:Kitti Balog, Andrea Farsang, and Tivadar M. Tóth
Hungarian Plain (Case study about the risk of sewage thermal water seepage on soil medium). Carpathian Journal of Earth and Environmental Sciences. 6. (1) 229–240.
Balog K., Farsang A. & Czinkota I., 2011b. A használt hévíz
Authors:J. Cizdziel, Y. Wei, K. Stetzenbach, V. Hodge, J. Cline, R. Howley, and F. Phillips
Samples of rock, soil and seepage were collected from Yucca Mountain, USA, and analyzed for 36Cl/Cl ratios by accelerator mass spectrometry (AMS). Rock excavated from the Drill Hole Wash fault at repository horizon depths
produced a ratio suggesting that small amounts of water with “bomb-pulse” 36Cl had percolated to that site over the past 50 years. Rock from four other sites within the exploratory studies facility
did not yield bomb-pulse ratios. Ratios in the soil varied depending on depth and location, with some samples producing bomb-pulse
signatures. Ratios for seep water were slightly elevated above the present cosmogenic background value. This paper also discusses
results from a column study mimicking the passage of 36Cl through volcanic rock and from an experiment using bromide instead of chloride as a carrier in sample preparation for AMS.
Some symptoms of excessive seepage of water were observed at the earthfill dam of the 400 MW Tri An hydropower plant in South Viet Nam. To provide experimental information for assessing the situation, isotope tracer experiments were performed using 24 existing piezometric boreholes encompassing a 1100 m long middle section of the dam. Filtration velocities measured were in the ranges (0.2–30) cm d–1 in the dam body and (0.5–75) cm d–1 in subsurface strata. No abnormally permeable horizons were detected. Permeability coefficients were calculated and compared with that obtained in pre-project hydrogeological surveys and by field tests during dam construction. Tracer experiments yielded permeability of the same range for the subsurface aquifer but from one to two orders of magnitude higher for the dam body. Such a dramatic change of permeability of the dam body me dia is interpreted as a result of interaction with seeping water after reservoir impoundment. A transient erosion process took place during several years. The losses of water by seepage through the dam body and infiltration to underground water were estimated as 1100 m3 d–1 and 15,000 m3 d–1 respectively, less than 1/2000 of the quantity of water consumed for power generation. A multi-well interconnection experiment was performed to determine the velocity and direction of subsurface flows.
Authors:Nils Baumann, Thuro Arnold, and Martin Lonschinski
In situ leaching of uranium ores with sulfuric acid during active uranium mining activity on the Gessenheap has caused longstanding
environmental problems of acid mine drainage and elevated concentrations of uranium. To study there remediation measures the
test site Gessenwiese, a recultivated former uranium mining heap near Ronnenburg/East Thuringia/Germany, was installed as
a part of a research program of the Friedrich-Schiller University Jena to study, among other techniques, the phytoremediation
capacity of native and selected plants towards uranium. In the first step the uranium speciation in surface seepage and soil
pore waters from Gessenwiese, ranging in pH from 3.2 to 4.0, were studied by time-resolved laser-induced fluorescence spectroscopy
(TRLFS). Both types of water samples showed mono-exponential luminescence decay, indicating the presence of only one major
species. The detected emission bands were found at 477.5, 491.8, 513.0, 537.2, 562.3, and 590.7 nm in case of the surface
water samples, and were found at 477.2, 493.2, 513.8, 537.0, 562.4, and 590.0 nm in case of the soil water samples. These
characteristic peak maxima together with the observed mono-exponential decay indicated that the uranium speciation in the
seepage and soil pore waters is dominated by the uranium (VI) sulfate species UO2SO4(aq). Due to the presence of luminescence quenchers in the natural water samples the measured luminescence lifetimes of the UO2SO4(aq) species of 1.0–2.6 μs were reduced in comparison to pure uranium sulfate solutions, which show a luminescence lifetime of
4.7 μs. These results convincingly show that in the pH range of 3.2–4.0 TRLFS is a suitable and very useful technique to study
the uranium speciation in naturally occurring water samples.
Investigations are currently carried out in Saxony to study environmental impacts due to uranium-mining activities. Radioactive and other inorganic species were determined in both mining waters of different origin and leachates from mediumscale column experiments and batch-tests. Uranium concentrations were measured using -spectrometry, absorption spectrophotometry, square-wave polarography and inductively coupled mass spectrometry. For mining waters the concentration range was less than 1 to ca 4 mg·dm–3, in one case up to 7 mg·dm–3.
Authors:M. Nakada, M. Saeki, N. Masaki, and S. Tsutsui
Preparation of source and sample holder is described for the Mössbauer studies of237Np and238U. For the Mössbauer measurement of237Np, a source assembly with small sources of241Am metal was developed taking account of the transport regulations for radioactive substances. The source assembly of241Am showed a sufficient activity enough to measure the Mössbauer spectra of237Np. In order to handle237Np compounds safely, trebly sealed holders were designed which could encapsulate237Np samples without the seepage of liquid helium. A source for238U Mössbauer measurement was also developed from a highly pure242PuO2.
Authors:M. Svetina, B. Smodiš, Z. Jeran, and R. Jaćimović
Three watersheds were studied by sampling bulk precipitation deposition, seepage water at 50 cm soil depth and spring water. As the main analytical method for determination of trace elements and heavy metals in water samples, thek0-based method of INAA was used. The results showed an increased content and concentration range of trace elements in precipitation, soil water and spring water in the vicinity of the otanj Thermal Power Plant. We demonstrated that thek0-based method of INAA as a multielement nondestructive technique is a highly suitable approach to determining some toxic trace elements in environmental studies of the water cycle.
Curium was produced for experimental programs for use as a heat source for isotopic electrical power generators and by 1968
approximately 5 kg had been produced at the Savannah River Site (SRS). Size fractionated groundwater samples were collected
near a disposal basin in F-Area at SRS in 1998 and in 2004. Separation of 244Cm via extraction chromatographic methods was followed by alpha spectrometric measurement. In both years a trend of increasing
Cm activities downstream of the seepage site was observed. Migration and immobilization resulting from base injection remediation
between sampling dates explain large differences in 244Cm concentration.