Entity

Time filter

Source Type


Oprea G.M.,Technical University of Cluj Napoca | Michnea A.M.,Environmental Protection Agency Maramures | Mihali C.,Technical University of Cluj Napoca
Revue Roumaine de Chimie | Year: 2011

The influence of temperature and collector concentration on its adsorption rate on mineral surface was studied as regarding the 8-hydroxyquinoline/ smithsonite system. Theoretical equations as well as experimental data may be useful to estimate the adsorption rate and kinetics connected to the conditioning stage in mineral flotation in order to optimize the selectivity and the recovery of the valuable mineral. Source


Mihali C.,Technical University of Cluj Napoca | Michnea A.,Environmental Protection Agency Maramures | Oprea G.,Technical University of Cluj Napoca | Gogoasa I.,Banat University of Agricultural Sciences and Veterinary Medicine, Timisoara | And 3 more authors.
Journal of Food, Agriculture and Environment | Year: 2012

Baia Mare is a mining and metallurgical centre in North-west Romania producing lead and copper for over 150 years. The lead smelter is located in Ferneziu district in a relative densely populated area. We collected 11 soil samples around the lead smelter and also 44 vegetable samples of 8 vegetable species commonly grown in gardens in Ferneziu district. The contents of trace elements (As, Pb, Cd, Zn, Cu, Ni, Mn and Co) in soil and vegetables were analyzed by inductively coupled plasma atomic emission spectrometry. The average contents of As and heavy metals in the edible part of vegetable samples were: As 1.21; Pb 29.21; Cd 1.23; Zn 82.72; Cu 10.4; Ni 0.44; Mn 18.88 and Co 0.18 mg kg -1 dry weight (DW) while in the soil samples they were: 143.45; 3058.82; 6.28; 976.82; 607.82; 4.20; 1239.27 and 4.63 mg kg -1 DW. Pollution indexes were used in order to characterize the overall degree of soil and vegetable contamination with As and heavy metals. Pb is the prevalent pollutant element both in soil and vegetables but also important pollutants were Cd, As, Zn and Cu, while Co, Mn and Ni do not present any hazard due to their presence in soil or in plants. Transfer factors (TF) were calculated and they decrease in the following order: Cd > Ni > Zn > Co > Cu > Mn > Pb≈As. The high values of Cd TF for some vegetables like carrot, parsley and dill are of big concern. The consumption of the vegetables grown in Ferneziu area poses risk on the health of residents especially for vegetables having high values of TF or high concentration of pollutant elements (Cd, Pb, Zn and As) in the soil in their gardens. Source


Oprea G.,Technical University of Cluj Napoca | Michnea A.,Environmental Protection Agency Maramures | Mihali C.,Technical University of Cluj Napoca | Senila M.,Romanian National Institute for Optoelectronics | And 4 more authors.
American Journal of Environmental Sciences | Year: 2010

Problem statement: The objective of this research was to evaluate the degree of soil contamination with arsenic and antimony in Baia Mare, a nonferrous mining and metallurgical center located in the North West region of Romania. The soil in the area is affected by the emissions of powders containing metals from metallurgical factories. Previous studies indicated the soil contamination with copper, zinc, cadmium and lead, but there is few data about the actual level of soil pollution with arsenic and antimony. Approach: The soil samples were collected from 2 districts of Baia Mare: Ferneziu, which is located in the proximity of a lead smelter and Sǎsar district which is located along the Sǎsar River in the preferential direction of the wind over a metallurgical factory producing lead. As reference was considered Dura area located in a less polluted hilly area, in the west part of the town. Samples of soil and plants from the residential area of Ferneziu, Sǎsar and Dura districts were collected. The arsenic determination was carried out by inductively coupled plasma atomic emission spectrometry and the antimony determination by inductively coupled plasma mass spectrometry. Results: In Ferneziu area, the concentration of arsenic in soil ranged between 0.25 and 255 mg kg-1. In Sǎsar district the arsenic concentration in the soil ranged between 5.5 and 295 mg kg-1. Regarding antimony, in Ferneziu area the concentration ranged between 5.3 and 40.6 mg kg-1; while in Sǎsar, antimony soils concentrations vary in the range: 0.9-18.4. Arsenic and antimony concentrations in plants were low for almost of the samples, both in Ferneziu and Sǎsar area indicating a low mobility of these elements in the studied soils. Conclusion: This study indicated the soil pollution with arsenic both in Ferneziu district and in Sǎsar district. The soil pollution with antimony was found especially in Ferneziu district. © 2010 Science Publications. Source


Mihali C.,Technical University of Cluj Napoca | Oprea G.,Technical University of Cluj Napoca | Michnea A.,Environmental Protection Agency Maramures | Jelea S.-G.,Technical University of Cluj Napoca | And 4 more authors.
Carpathian Journal of Earth and Environmental Sciences | Year: 2013

In order to assess the soil pollution level by heavy metals and also the possibility of metals entrance in the food chain via plants, pollution load index (PLI), contamination factors (CF) and soil to plant transfer factors (TF) were calculated. Topsoil samples (1-10 cm) and plants growing on them were collected from four areas in Baia Mare city and surroundings: three polluted areas (Ferneziu, Sǎsar and Center) and one reference area. The following heavy metals: Cu, Zn, Pb, Cd, Ni, Cr, Co, Mn, Sn were analyzed in soil and plant samples by inductively coupled plasma atomic emission spectrometry. The highest TF were obtained for Cd (0.66-3.13) while the lowest values were calculated for Pb (0.004-0.02). The contamination level of the soil within the investigated areas was assessed according to PLI values. Ferneziu district, where the lead smelter is located, was found being the most polluted site for Cd, Pb, Cu, Zn and Sn. Cluster analysis was conducted in order to classify metals of different sources and origins. Cd, Pb, Sn, Zn and Cu occur as a result of anthropogenic activities while Co, Cr, Mn and Ni in soil can be naturally found in the soil composition. Source


Oprea G.,Technical University of Cluj Napoca | Mihali C.,Technical University of Cluj Napoca | Michnea A.,Environmental Protection Agency Maramures | Senila M.,Institute of National Research and Development | And 2 more authors.
American Journal of Environmental Sciences | Year: 2011

Problem statement: The objective of this research was to assess the degree of soil pollution and also of Plant contamination with lead (Pb) and cadmium (Cd) in Baia Mare city (located in NW Romania) area which used to be one of the most important nonferrous metallurgical centers in Romania. Approach: Soil and plant samples were collected from 3 districts of Baia Mare: Ferneziu, located near the metallurgical plant producing lead, Sǎsar district, along the Sǎsar River in the preferential direction of the wind blowing from the metallurgical plant and the central area (Center) of the city of Baia Mare. As reference area, Dura area was considered located in a less polluted zone. The Pb and Cd assay was carried out by inductively coupled plasma atomic emission spectrometry. Statistical analysis of the data was performed and correlations and similarities between the variables were highlighted. Principal component analysis was applied in order to improve the significance and to reduce the number of variables. Results: The highest contents of Pb and Cd both in soil and in plants were found in Ferneziu district where Pb average content in soil was 4400 mg kg -1 dry weight (DW) at 0-10 cm depth and 3100 mg kg -1 DW at 10-20 cm depth while in plants ranged between 1.04-255 mg kg -1 DW. Cd content in soil was 29 mg kg -1 at 0-10 cm depth and 23 mg kg -1 at 10-20 cm depth. In plants, Cd content ranged between 0.015-4.81 mg kg -1 DW. In Sasar district and in Center area moderate soil pollution with Pb was found. Data analysis indicated significant correlations between Pb and Cd contents in the superficial soil level of 0-10 cm as well as between Pb and Cd contents in soil at the depth of 10-20 cm, showing that the powder coming from the metallurgical plants is the common source of these elements. Conclusion: The study shows a non-uniform spread of Pb and Cd both in soil and plants in Baia Mare city, due to anthropogenic influences. The highest contents of these elements were found in Ferneziu area in soil as well as in plant samples. Remediation measures are required prevalently in Ferneziu district around the lead smelter. © 2011 Science Publications. Source

Discover hidden collaborations