1. Water pollution in the impact areas of the two abandoned metal ore mines in Slovenia and PortugalDoroteja Gošar, 2015, undergraduate thesis Abstract: Mining in both Mežica zinc and lead mine and in Freixeda gold mine caused negative environmental impacts. The main objective of the thesis was to study negative impacts on water quality through time. During the process various literature sources were studied, field work and chemical analyses were performed and interpretation of results with different statistical methods was done.
In Mežica mine the quality of surface water has improved through time and nowadays the Meža River is of good quality. The biggest change was shown in the case of Helena rivulet, where Pb, Zn and Cd concentration between 2002 and 2015 lowered below limit values. Preventive measures and treatment of waste deposits had positive impact on water quality and based on standards for drinking water, groundwater from mine could be a source of drinking water. In Freixeda stream concentration of heavy metals lowered through time and in 2015 values of Zn, Pb, Cd and Cu in Freixeda stream before confluence with the Tua River were below the limit value. An exception is the increased value of As, which was caused by acid mine drainage (AMD) inflow from the mine, but also by the discharge from confined aquifer to Freixeda stream. Treatment of AMD was efficient for a while but due to lack of maintenance it is no longer effective.
Found in: ključnih besedah
Summary of found: ...water. In Freixeda stream concentration of heavy metals lowered through time and in 2015 values...
Keywords: Abandoned mines, heavy metals, pollution, Mežica mine, Freixeda mine
Published: 05.10.2015; Views: 5237; Downloads: 308
 Fulltext (4,82 MB) |
2. On the limits of acoustic emission detectability for twinningA Vinogradov, E Vasilev, M Seleznev, K Máthis, D Orlov, D Merson, 2016, original scientific article Found in: ključnih besedah
Summary of found: ... Metals and alloys, Deformation and fracture, Grain boundaries,...
Keywords: Metals and alloys, Deformation and fracture, Grain boundaries, Twinning, Acoustic emission
Published: 20.02.2017; Views: 3960; Downloads: 0
Fulltext (450,28 KB) |
3. Heavy metal analysis with in-situ prepared copper film electrode as a tool for environmental monitoringNana Ivana Hrastnik, 2017, master's thesis Abstract: Monitoring and measuring heavy metals in the environment is of great importance and requires sensitive and reliable analytical techniques capable of detecting trace level concentrations.
Nowadays, measurements of heavy metals are usually performed using sophisticated and expensive instrumental techniques, such as atomic absorption spectroscopy (AAS), atomic fluorescence spectroscopy (AFS), inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma optical emission spectroscopy (ICP-OES) etc. In this aspect, advanced electroanalytical (stripping) techniques represent a favourable alternative, facilitating sensitive and selective measurements of various analytes using relatively simple, portable and non-expensive instrumentation.
This work is an investigation of novel copper-based electrodes for measuring trace levels of selected heavy metal ions, i.e. mercury(II), lead(II), tin(IV) and nickel(II).
The methods of choice were anodic stripping voltammetry (ASV) in combination with the in-situ prepared copper film electrode (CuFE) for measuring low concentrations of mercury(II) and lead(II) (simultaneously) and tin(IV) in the test solutions and adsorptive cathodic stripping voltammetry (AdCSV) for determination of nickel(II).
Metal-film electrodes are regularly employed in electrochemical stripping analysis due to their simple fabrication and surface regeneration. The newly developed CuFE appears to be a cheaper alternative to gold-based electrodes with several attractive electroanalytical characteristics, i.e. with low limits of detection (LOD), good repeatability and favourable linear response.
Found in: ključnih besedah
Summary of found: ...Monitoring and measuring heavy metals in the environment is of great importance...
Keywords: Copper film electrode, anodic stripping voltammetry, adsorptive cathodic stripping voltammetry, heavy metals, environment.
Published: 12.09.2017; Views: 4198; Downloads: 260
Fulltext (1,78 MB) |
4. Alternative Recovery and Valorization of Metals from Exhausted Catalytic Converters in a New Smart Polymetallic CatalystOreste Piccolo, Laura Sperni, Michele Gallo, Katarina Vogel-Mikuš, Iztok Arčon, Franco Baldi, Sebastiano Tieuli, Stefano Paganelli, 2019, original scientific article Abstract: A new metals-polymeric composite, Metx-EPS (I), was prepared
to be used as catalyst in water or in two-phase aqueous
conditions. The metals source was an exhausted catalytic
converter that was grinded and treated with an acidic solution at room temperature. After filtration, the solution was concentrated, neutralized and added to a broth of Klebsiella oxytoca DSM 29614 to produce (I) where metals are embedded in a peculiar polysaccharide structure (EPS). The composite was easily recovered from the fermentation broth and purified. The process protocol was verified many times and was shown to be reproducible satisfactorily. The % recovery of metals, originally present in the converter, was good as determined by atomic
absorption. The morphology and the chemical state of main
metals in (I) were investigated by X-ray absorption spectroscopy
methods (XANES and EXAFS). No metallic alloy seems to
be evident. The catalytic activity and a possible synergic effect due to the presence of the different metals was valuated in the hydrogenation of some substrates, valuable precursors for theproduction of fine chemicals.
Found in: ključnih besedah
Keywords: Biogenerated polymetallic exopolysaccharide, biphasic catalysis, hydrogenation, metals-polymeric
composite, new catalyst from metallic wastes, EXAFS, XANES
Published: 06.05.2019; Views: 2489; Downloads: 0
Fulltext (2,87 MB) |
5. A Biogenerated Polymetallic Catalyst from Society's WastesOreste Piccolo, Stefano Paganelli, Petro Zanatta, Sebastiano Tieuli, Laura Sperni, Franco Baldi, Iztok Arčon, Michele Gallo, Katarina Vogel-Mikuš, 2019, original scientific article Abstract: Aims:Preparation of the new metals - polymeric composite, Met x-EPS (I), to be used as a green catalyst in water or in two-phase aqueous conditions.
Study Design:
Recovery and valorization of polymetallic
wastes to obtain directly new catalysts
using a microorganism to explore their application in removal of difficult and dangerous chemical
pollutants present in aqueous environment
Found in: ključnih besedah
Summary of found: ...Aims:Preparation of the new metals - polymeric composite, Met x-EPS...
Keywords: Metals
-
polymeric composite, biogenerated polymetallic exopolysaccharide, new catalyst
from metallic wastes, hydrodechlorination
of PCBs in water
Published: 06.05.2019; Views: 2702; Downloads: 0
Fulltext (373,55 KB) |
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7. Under fungal attack on a metalliferous soil: ROS or not ROS? Insights from Silene paradoxa L. growing under copper stressCosimo Taiti, Elisabetta Giorni, Ilaria Colzi, Sara Pignattelli, Nadia Bazihizina, Antonella Buccianti, Simone Luti, Luigia Pazzagli, Stefano Mancuso, Cristina Gonnelli, 2016, original scientific article Abstract: We investigated how the adaptation to metalliferous environments can influence the plant response to biotic stress. In a metallicolous and a non-metallicolous population of Silene paradoxa the induction of oxidative stress and the production of callose and volatiles were evaluated in the presence of copper and of the PAMP fungal protein cerato-platanin, separately and in combination. Our results showed incompatibility between the ordinary ROS-mediated response to fungal attack and the acquired mechanisms of preventing oxidative stress in the tolerant population. A similar situation was also demonstrated by the sensitive population growing in the presence of copper but, in this case, with a lack of certain responses, such as callose production. In addition, in terms of the joint behaviour of emitted volatiles, multivariate statistics showed that not only did the populations respond differently to the presence of
copper or biotic stress, but also that the biotic and abiotic stresses interacted in different ways in the two populations.
Our results demonstrated that the same incompatibility of hyperaccumulators in ROS-mediated biotic stress signals also seemed to be exhibited by the excluder metallophyte, but without the advantage of being able to rely on the elemental defence for plant protection from natural enemies.
Found in: ključnih besedah
Summary of found: ...Biotic interactions
Callose
Heavy metals
Oxidative stress
VOCs...
Keywords: Biotic interactions
Callose
Heavy metals
Oxidative stress
VOCs
Published: 20.04.2020; Views: 2532; Downloads: 0
Fulltext (6,63 MB) |
8. Exploring element accumulation patterns of a metal excluder plant naturally colonizing a highly contaminated soilSara Pignattelli, Ilaria Colzi, Lorenzo Cecchi, Miluscia Arnetoli, Roberto Monnanni, Roberto Gabbrielli, Cristina Gonnelli, 2012, original scientific article Abstract: This work investigates the element distribution in Silene paradoxa growing on the mine dump of Fenice Capanne (Tuscany, Italy). The accumulation of As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn in root apoplast and symplast and in shoot was assessed and compared to the levels of the same metals in the respective rizosphere soils, analyzing both the total and the phytoavailable fractions.
Levels of As, Cu, Fe, Pb and Zn, were above toxicity thresholds in both soil and shoot samples. Inter- and intra-element correlations were analyzed in plant and soil using different statistical methods. Soil total and phytoavailable metal concentration were shown not to be dominant in determining metal accumulation by the plant, since no significant positive correlation was found between metal concentration in soils and plants. Moreover, results indicated that S. paradoxa was able to cope with the studied multi-metal contaminated soil excluding the elements from its tissues and preferentially accumulating them into the root compartment, thus suggesting this species as possible good candidate for phytostabilization purposes.
Found in: ključnih besedah
Summary of found: ...compared to the levels of the same metals in the respective rizosphere soils, analyzing both...
Keywords: Metals, Mine dump, Phytostabilization, Silene paradoxa, Compositional data analysis
Published: 20.04.2020; Views: 2132; Downloads: 0
Fulltext (4,42 MB) |
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10. OBJECTIVE AND PERCEIVED ENVIRONMENTAL QUALITY IN THE TOWNS OF ZENICA AND MARIBORIvana Pandža, Katja Belec, Matjaž Žvokelj, Merima Vrškić, Tajda Huber, Ula Urbas, 2020, treatise, preliminary study, study Abstract: In this study, we measured the concentrations of specific heavy metals in the soil and sediment samples taken on different locations of the cities of Maribor (Slovenia), and Zenica (Bosnia and Herzegovina). The report also includes a questionnaire regarding the residents’ views about the environmental quality of the city they live in.
Found in: ključnih besedah
Summary of found: ...we measured the concentrations of specific heavy metals in the soil and sediment samples taken...
Keywords: Soil, sediments, heavy metals, AAS, pollution, questionnaire, environmental quality.
Published: 11.09.2020; Views: 1950; Downloads: 0
Fulltext (10,44 MB) |
