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Mos R.B.,Technical University of Cluj Napoca | Petrisor T.,Technical University of Cluj Napoca | Nasui M.,Technical University of Cluj Napoca | Mesaros A.,Technical University of Cluj Napoca | And 5 more authors.
Materials Letters | Year: 2016

We report on the preparation and characterization of a nanosystem deposited on (001)MgO substrates consisting of La0.7Sr0.3MnO3 (LSMO) nanoinslands prepared by a new method derived from the polymer-assisted deposition, namely polymer-assisted surface decoration (PASD). The LSMO nanostructures were grown at 1100 °C for 4 min. under ambient atmosphere from a polymeric precursor solution. The X-ray diffraction (XRD) measurements (2θ/ω and φ scans) show cube-on-cube epitaxial growth of the LSMO nanoislands on the (100)MgO substrate. Atomic force microscopy (AFM) studies have revealed the homogenous distribution of the nanoislands grown on the substrate surface. Statistical information, size, height and density of the nanoislands have been extracted from the AFM images. The TEM investigation of the LSMO/MgO interface reveals the presence of misfit dislocations. © 2016 Elsevier B.V. All rights reserved .


Baceva K.,Ss. Cyril and Methodius University of Skopje | Stafilov T.,Ss. Cyril and Methodius University of Skopje | Sajn R.,Geological Survey of Slovenia | Tanaselia C.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2012

The purpose of this study was to establish the atmospheric deposition of various elements in the Kavadarci region, Republic of Macedonia (known for its ferronickel mining and metallurgical activities) using moss biomonitoring, and to determine whether the deposition is anthropogenic or from geogenic influences. The sampling network includes 31 moss samples evenly distributed over a territory of about 600 km2. A total of 46 elements (Ag, Al, As, Au, Ba, Be, Ca, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Fe, Ga, Gd, Ge, Hg, Ho, K, La, Li, Lu, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Rb, Sb, Sm, Sr, Tb, Th, Ti, U, V, Yb, Zn, Zr) were determined by mass spectrometry with inductively coupled plasma (ICP-MS). Based on a distribution pattern of elements determined in moss, two anthropogenic geochemical associations (Co-Cr-Cu-Fe-Mg-Ni and As-Cd-Cu-Hg-Pb-Zn), were detected. The distribution of these elements shows an increased content (especially Ni, Co and Cr) in the moss samples from the surroundings of the smelter plant compared to the rest of the samples. Thus, the median value of Ni in moss samples from the whole region (40 mg kg -1) is much higher than the median for Macedonia (5.82 mg kg -1). Moreover, the median content of Ni in the moss samples from the polluted area (around the smelter) is 178 mg kg-1 with an enrichment ratio in the moss samples of almost 5.5 times higher than the unpolluted areas (32 mg kg-1). This fact confirms the influence of the dust from the ferronickel plant to the air pollution in this region. Copyright © Taylor & Francis Group, LLC.


Baceva K.,Ss. Cyril and Methodius University of Skopje | Stafilov T.,Ss. Cyril and Methodius University of Skopje | Sajn R.,Geological Survey of Slovenia | Tanaselia C.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA | Makreski P.,Ss. Cyril and Methodius University of Skopje
Environmental Research | Year: 2014

The aim of this study was to investigate the distribution of some toxic elements in topsoil and subsoil, focusing on the identification of natural and anthropogenic element sources in the small region of rare As-Sb-Tl mineralization outcrop and abandoned mine Allchar known for the highest natural concentration of Tl in soil worldwide. The samples of soil and sediments after total digestion were analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). Factor analysis (FA) was used to identify and characterize element associations. Six associations of elements were determined by the method of multivariate statistics: Rb-Ta-K-Nb-Ga-Sn-Ba-Bi-Li-Be-(La-Eu)-Hf-Zr-Zn-In-Pd-Ag-Pt-Mg; Tl-As-Sb-Hg; Te-S-Ag-Pt-Al-Sc-(Gd-Lu)-Y; Fe-Cu-V-Ge-Co-In; Pd-Zr-Hf-W-Be and Ni-Mn-Co-Cr-Mg. The purpose of the assessment was to determine the nature and extent of potential contamination as well as to broadly assess possible impacts to human health and the environment. The results from the analysis of the collected samples in the vicinity of the mine revealed that As and Tl elements have the highest median values. Higher median values for Sb are obviously as a result of the past mining activities and as a result of area surface phenomena in the past. © 2014 Elsevier Inc.


Balabanova B.,Goce Delcev University of Štip | Stafilov T.,Ss. Cyril and Methodius University of Skopje | Sajn R.,Geological Survey of Slovenia | Tanaselia C.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA
Environmental Science and Pollution Research | Year: 2016

Atmospheric deposition was investigated using the terrestrial moss species Hypnum cupressiforme (Hedw.) and Homolothecium lutescens (Hedw.) in the Bregalnica River basin, Republic of Macedonia. Long-term emission occurs in this area due to the hydrothermal exploitation of Pb–Zn deposits (Sasa and Zletovo mines) and copper ore exploitation and floatation (Bučim mine). Determination of the chemical elements was conducted using atomic emission spectrometry with inductively coupled plasma (ICP-AES) and mass spectrometry with inductively coupled plasma (ICP-MS). A combination of multivariate techniques (PCA, FA and CA) was applied for data processing and identification of element association with lithogenic/anthropogenic origin. Seven dominant factors were extracted from the total of 69 analysed elements. Spatial distribution maps were constructed for the determination and localisation of smaller areas with higher contents of certain anthropogenic elements. In this way, the influences of selected human activities on local air pollution can be determined. The summarised data show quantification of the element distributions. This not only allows the determination of the distribution of hazardous elements but also presents complete characterisation of element deposition in the environs of mines. © 2016 Springer-Verlag Berlin Heidelberg


PubMed | Geological Survey of Slovenia, INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA, Ss. Cyril and Methodius University of Skopje and Goce Delcev University of Štip
Type: Journal Article | Journal: Archives of environmental contamination and toxicology | Year: 2016

Attic dusts were examined as historical archives of anthropogenic emissions, with the goal of elucidating the enrichment pathways associated with hydrothermal exploitation of Cu, Pb, and Zn minerals in the Bregalnica River basin in the eastern part of the Republic of Macedonia. Dust samples were collected from 84 settlements. Atomic emission spectrometry and mass spectrometry with inductively coupled plasma were applied as analytical techniques for the determination of 69 element contents. Multivariate analysis was applied for the extraction of dominant geochemical markers. The lithogenic distribution was simplified to six dominant geochemical markers: F1: Ga-Nb-Ta-Y-(La-Gd)-(Eu-Lu); F2: Be-Cr-Li-Mg-Ni; F3: Ag-Bi-Cd-Cu-In-Mn-Pb-Sb-Te-W-Zn; F4: Ba-Cs-Hf-Pd-Rb-Sr-Tl-Zr; F5: As-Co-Ge-V; and F6: -Na-Sc-Ti. The anthropogenic effects on the air pollution were marked by a dominance of F3 and secondary dominance of F5. The fifth factor also was determined as a lithogenic marker for the occurrence of the very old Rifeous shales. The first factor also presents a very unique association that despite the heterogeneity relays on natural phenomena of tracking the deposition in areas of Proterosoic gneisses; related to the distribution of fine particles was associated with carbonate-silicate volcanic rocks. Intensive poly-metallic dust depositions were recorded only in the surroundings of localities where the hydrothermal extractions are implemented. Long-term deposition can be considered as pollution indexes for these hot spots. This mainly affects the Cd, Pb, and Zn deposition that is as high as 25, 3900, and 3200mg/kg, respectively.


PubMed | Geological Survey of Slovenia, INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA, Ss. Cyril and Methodius University of Skopje and Goce Delcev University of Štip
Type: Journal Article | Journal: Environmental science and pollution research international | Year: 2016

Atmospheric deposition was investigated using the terrestrial moss species Hypnum cupressiforme (Hedw.) and Homolothecium lutescens (Hedw.) in the Bregalnica River basin, Republic of Macedonia. Long-term emission occurs in this area due to the hydrothermal exploitation of Pb-Zn deposits (Sasa and Zletovo mines) and copper ore exploitation and floatation (Buim mine). Determination of the chemical elements was conducted using atomic emission spectrometry with inductively coupled plasma (ICP-AES) and mass spectrometry with inductively coupled plasma (ICP-MS). A combination of multivariate techniques (PCA, FA and CA) was applied for data processing and identification of element association with lithogenic/anthropogenic origin. Seven dominant factors were extracted from the total of 69 analysed elements. Spatial distribution maps were constructed for the determination and localisation of smaller areas with higher contents of certain anthropogenic elements. In this way, the influences of selected human activities on local air pollution can be determined. The summarised data show quantification of the element distributions. This not only allows the determination of the distribution of hazardous elements but also presents complete characterisation of element deposition in the environs of mines.


Balabanova B.,Goce Delcev University of Štip | Stafilov T.,University of Macedonia | Sajn R.,Geological Survey of Slovenia | Tanaselia C.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2016

The main subject of this investigation was the assessment of the lithogenic and anthropogenic distribution of 69 elements in the sediments and fluvisol in the Bregalnica river basin. Alluvial soil and fluvisol samples were collected from the total of eighteen locations along the course of the Bregalnica river and additional thirteen samples were collected from its tributaries. The matrix elements accumulation patterns followed the order: Fe > Na > Al > Ca > Mg > K > Ti > P. The potentially toxic elements, such as As, Cd, Pb, and Zn, have enriched content in the sediments in the medium course of the river, where the main anthropogenic introduction activities occurred. By multivariate analysis the dominant geochemical associations were extracted, as follows: F1: Y-Eu-Lu-Cr-V-La-Gd-Nb-Co-Hf-Zr-Ga-Mg-Fe-Sr-Ta-Sn-Li-Na-Rb-Ni-Ge-Be-Cs; F2: As-W-Ba-Ag-Cu-Tl-Zn-Sb-Mo-In-Cd-Te-Bi-Pb and F3: I-Sc-Br-K. Lead and zinc contents were strongly correlated with the hydrothermal exploitations, especially in the area of Neogene clastite and vulcanite. These elements occur as dominant geochemical markers of the anthropogenic impacts of polymetallic enrichments due to the hydrothermal ore exploitation (Factor 2). The impact of Oligocene volcanism (Kratovo-Zletovo region) was observed in the lithological enrichments of Pb, Zn, Cu, As, Sb, Mo and Bi. Despite the natural distribution along the course of the Bregalnica river, an exceptional anomaly in the iron distribution of the old polymetallic unused mineralization was detected in Zone 1 (Berovo region). © 2016 Taylor & Francis Group, LLC


Gog A.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA | Senila L.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA | Roman M.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA | Luca E.,University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca | And 2 more authors.
Studia Universitatis Babes-Bolyai Chemia | Year: 2012

Microalgae, the third generation biodiesel feedstock, have emerged as one of the most promising alternative sources of lipids that can be used in the production of biodiesel due to their advantages over conventional crops. The aim of this study was to obtain Nannochloropsis oculata microalgae oil using hexane extraction methods together with fatty acid characterization for biodiesel application. The chemical composition of microalgae showed a high total lipid content, N. oculata microalgae being a potential feedstock for biodiesel production. For algal oil extraction, dynamic extraction with Soxhlet apparatus proved more efficient, with a lipid yield of 0.190 g/g dried microalgae comparatively to only 0.136 g lipid/g dried microalgae for static hexane extraction. The main fatty acids for N. oculata microalgae are palmitic acid, palmitoleic acid, eicosatrienoic acid and eicosapentaenoic acid, the latest being also the major constituent, with a value of 48.86% (w/w).


Gog A.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA | Senila L.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA | Barsan S.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA | Puscas A.,INCDO INOE 2000 Research Institute for Analytical Instrumentation ICIA | Luca E.,University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca
Studia Universitatis Babes-Bolyai Chemia | Year: 2011

This paper reports a full evaporation (FE) headspace gas chromatographic (HS-GC) method for rapid determination of ethanol in sugar beet fermentation liquid. In this method, a very small volume,10 μL of sugar beet fermentation liquid sample is introduced into a headspace sample vial and heated up to a temperature of 105 °C, when a full evaporation can be achieved within 3 min. The ethanol in the headspace of the vial is then measured by GCFID. The full evaporation technique showed a good reproducibility, with a relative standard deviation less than 2.54% for six measurements. The method was verified by using spiked fermentation samples with different volumes of standard ethanol solution when ethanol concentrations were determined together with their corresponding confidence intervals, the relative standard deviations and the recovery degrees. The relative standard deviations ranged from 1.18% to 2.59% and the recovery degrees ranged from 88.7% to 92.6%. The present method is simple, rapid and requires no sample pretreatment.

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