Water pollution in the impact areas of the two abandoned metal ore mines in Slovenia and PortugalDoroteja Gošar
, 2015, diplomsko delo
Opis: 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.
Najdeno v: ključnih besedah
Povzetek najdenega: ...drinking water. In Freixeda stream concentration of heavy metals lowered through time and in 2015...
Ključne besede: Abandoned mines, heavy metals, pollution, Mežica mine, Freixeda mine
Objavljeno: 05.10.2015; Ogledov: 2744; Prenosov: 168
Polno besedilo (4,82 MB)
Heavy metal analysis with in-situ prepared copper film electrode as a tool for environmental monitoringNana Ivana Hrastnik
, 2017, magistrsko delo
Opis: 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.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Monitoring and measuring heavy metals in the environment is of great importance...
Ključne besede: Copper film electrode, anodic stripping voltammetry, adsorptive cathodic stripping voltammetry, heavy metals, environment.
Objavljeno: 12.09.2017; Ogledov: 1773; Prenosov: 121
Polno besedilo (1,78 MB)
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, izvirni znanstveni članek
Opis: 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.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Biotic interactions
Ključne besede: Biotic interactions
Objavljeno: 20.04.2020; Ogledov: 96; Prenosov: 0
Polno besedilo (6,63 MB)