The behavior of arsenic and antimony at Pezinok mining site,southwestern part of the Slovak Republic     

Renata Flakova  Zlatica Zenisova  Ondra Sracek  David Krcmar  Ivana Ondrejkova  Martin Chovan  Bronislava Lalinská  Miriam Fendekova 《Environmental Earth Sciences》2012,66(4):1043-1057

Arsenic and antimony contamination is found at the Pezinok mining site in the southwest of the Slovak Republic. Investigation of this site included sampling and analysis of water, mineralogical analyses, sequential extraction, in addition to flow and geochemical modeling. The highest dissolved arsenic concentrations correspond to mine tailings (up to 90,000 μg/L) and the arsenic is present predominately as As(V). The primary source of the arsenic is the dissolution of arsenopyrite. Concentration of antimony reaches 7,500 μg/L and its primary source is the dissolution of stibnite. Pore water in mine tailings is well-buffered by the dissolution of carbonates (pH values between 6.6 and 7.0) and arsenopyrite grains are surrounded by reaction rims composed of ferric iron minerals. Based on sequential extraction results, most solid phase arsenic is in the reducible fraction (i.e. ferric oxyhydroxides), sulfidic fraction, and residual fraction. Distribution of antimony in the solid phase is similar, but contents are lower. The principal attenuation mechanism for As(V) is adsorption to ferric oxide and hydroxides, but the adsorption seems to be limited by the competition with Sb(V) produced by the oxidation of stibnite for adsorption sites. Water in mine tailings is at equilibrium with gypsum and calcite, but far from equilibrium with any arsenic and antimony minerals. The concentrations of arsenic and antimony in the surrounding aquifer are much lower, with maximum values of 215 and 426 μg/L, respectively. Arsenic and antimony are transported by ground water flow towards the Blatina Creek, but their loading from ground water to the creek is much lower compared with the input from the mine adits. In the Blatina Creek, arsenic and antimony are attenuated by dilution and by adsorption on ferric iron minerals in stream sediments with resulting respective concentrations of 93 and 45 μg/L at the site boundary south of mine tailing ponds.  相似文献   

Erratum to: Modeling the photosynthetically active radiation in South West Amazonia under all sky conditions     

Leonardo J. G. Aguiar  Graciela R. Fischer  Richard J. Ladle  Ana C. M. Malhado  Flávio B. Justino  Renata G. Aguiar  José Maria N. da Costa 《Theoretical and Applied Climatology》2012,108(3-4):641-643

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Copper and zinc content of periphyton from two rivers as a function of dissolved metal concentration   总被引：5，自引：0，他引：5  

Renata Behra  Rolf Landwehrjohann  Katrin Vogel  Bettina Wagner  Laura Sigg 《Aquatic Sciences - Research Across Boundaries》2002,64(3):300-306

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Statistical Analysis of Temporal Variations of Seismicity Level in Some Italian Regions     

Renata Rotondi 《Natural Hazards》1999,19(2-3):139-150

Rotondi and Pagliano considered the problem of identifying periods with different seismicity levels as a multiple-changepoint problem: after having estimated the complete part of the historical catalog related to a seismic source zone, inference was made about the number and the location of k 1 changepoints of the occurrence rate in a sequence of n observations from a generalized Poisson process through a stepwise procedure. In this work, we extend such a method estimating the number of changepoints, their location, and other model parameters simultaneously. A fundamental role is played by new computational methods based on the simulation of Markov chains. In particular, we have applied a new version of the reversible jump Metropolis–Hastings algorithm to the data of some Italian seismic sources and we have identified periods with alternately higher and lower seismic activity levels.  相似文献   

Retrieving geomagnetic secular variations from lava flows: evidence from Mounts Arso, Etna and Vesuvius (southern Italy)     

Alberto Incoronato  Antimo Angelino  Romolo Romano  Agostino Ferrante  Renata Sauna  Gianpio Vanacore  Claudio Vecchione 《Geophysical Journal International》2002,149(3):724-730

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Introduction     

Renata Dmowska  Göran Ekström 《Pure and Applied Geophysics》1993,140(2):179-181

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Introduction     

Renata Dmowska  Göran Ekström 《Pure and Applied Geophysics》1994,142(1):1-2

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A Ta,Ti–rich oxide mineral assemblage from the Nancy beryl–columbite–phosphate granitic pegmatite,San Luis,Argentina     

Galliski  Miguel Ángel  Márquez-Zavalía  María Florencia  Škoda  Radek  Novák  Milan  Čopjaková  Renata  Pagano  Diego Sebastián 《Mineralogy and Petrology》2019,113(5):687-701

Mineralogy and Petrology - An assemblage of tantalite-(Mn), tantalian rutile, tapiolite-(Fe), titanowodginite, ferrotitanowodginite, and hydroxycalciomicrolite occurs in the Nancy granitic...  相似文献   

The influence of parametric uncertainty on the relationships between HBV model parameters and climatic characteristics   总被引：1，自引：1，他引：0  

Marzena Osuch  Renata J. Romanowicz  Martijn J. Booij 《水文科学杂志》2015,60(7-8):1299-1316

Abstract

An HBV rainfall–runoff model was applied to test the influence of climatic characteristics on model parameter values. The methodology consisted of the calibration and cross-validation of the HBV model on a series of 5-year periods for four selected catchments (Axe, Kamp, Wieprz and Wimmera). The model parameters were optimized using the SCEM-UA method which allowed for their uncertainty also to be assessed. Nine climatic indices were selected for the analysis of their influence on model parameters, and divided into water-related and temperature-related indices. This allowed the dependence of HBV model parameters on climate characteristics to be explored following their response to climate change conditioned on the catchment’s physical characteristics. The Pearson correlation coefficient and weighted Pearson correlation coefficient were used to test the dependence. Most parameters showed a statistically significant dependence on several climatic indices in all catchments. The study shows that the results of the correlation analysis with and without parametric uncertainty taken into account differ significantly.  相似文献   

Marine debris ingestion by coastal dolphins: What drives differences between sympatric species?     

Ana Paula Madeira Di Beneditto  Renata Maria Arruda Ramos 《Marine pollution bulletin》2014

This study compared marine debris ingestion of the coastal dolphins Pontoporia blainvillei and Sotalia guianensis in a sympatric area in Atlantic Ocean. Among the 89 stomach contents samples of P. blainvillei, 14 (15.7%) contained marine debris. For S. guianensis, 77 stomach contents samples were analyzed and only one of which (1.30%) contained marine debris. The debris recovered was plastic material: nylon yarns and flexible plastics. Differences in feeding habits between the coastal dolphins were found to drive their differences regarding marine debris ingestion. The feeding activity of P. blainvillei is mainly near the sea bottom, which increases its chances of ingesting debris deposited on the seabed. In contrast, S. guianensis has a near-surface feeding habit. In the study area, the seabed is the main zone of accumulation of debris, and species with some degree of association with the sea bottom may be local bioindicators of marine debris pollution.  相似文献