جستجوی مقالات مرتبط با کلیدواژه « enrichment factor » در نشریات گروه « مهندسی معدن »

With a view to estimate the heavy metals ratio in the surfacial soils of the Sarcheshmeh copper mine area and to evaluate the pollution level, 120 surfacial soil samples have been collected up to the depth of 30 centimeters and have been analyzed for the heavy metals of Pb, Ni, Se, Mo and Zn with the help of Inductively Coupled Plasma-Mass Spectrometer (ICP- MS). In the samples of the studied soil, the average of the recorded concentration of elements for lead, Nickel, Selenium, Molybdenum and zinc are 127, 27, 1, 7 and 252 (mg/kg) respectively. The order of the average frequency of the heavy metals concentration consist of Zn>Pb> Ni> Mo> Se. The comparison of the heavy metals concentration average and the toxic potential in the soil samples has shown that an average with respect to the world average of the uncontaminated soil amounts and shale. The average of Pb, Ni, Se, Mo and Zn elements shows a higher quantity with respect to the world average quantity. Ni element contains lesser average as compare to the shale average. The pollution factor for the study elements has been calculated on the basis of the soil background concentration and has been categorized on the basis of the uncontaminated world soil average with respect to the Hakenson classification. The calculation of the corrected pollutant degree shows the degree of the bulk intermediate pollutant (2.99-3.24) for the average soil sampling of the study area which is on the basis of the background quantity and the world average quantity of the uncontaminated soils. The provided conclusion from the calculation of the concentrated factor, for some of the samples show that the average of the lead, Zinc and Mo elements stations are more than the background values and the unnatural metal concentration are covered under the study area. Given conclusion from the calculation of Geoaccumulation index of the soil sampling can explain that the Nickel and Selenium elements are lying with uncontaminated area and the Zinc and Mo elements are lying with uncontaminated area and up to low contaminated area and lead element is lying with the area of low contamination.

The Sungun Porphyry Copper Deposit is located in East-Azerbaijan province, 75km northwest of Ahar city. Due to mining activities, streams of this region (Sungunchay, Pakhirchay, Ilginechay and Zarnekabchay) are exposed to heavy metals contamination such as Cu, Mo, Pb, Zn and Ni. In this relation, to determine contamination degree caused by toxic metals, 27 sediment samples were analyzed and it was found that concentration of Cu, Mo, Pb, Zn and Ni are above permissible limits (local background of these metals). Elements Correlation coefficient indicates that Cu, Mo and Ni are correlated to Fe, while Pb and Zn are correlated to Mn. In addition, results from Enrichment Factor, Geo-accumulation Index, Contamination Factor and Pollution Load Index for sediment samples indicate that potentially toxic metals contamination exists.

The tailing dam of the Sarcheshmeh copper mine (Kerman, Iran) contains elevated concentrations the heavy metals. Therefore, the sediments of the Sarcheshmeh copper mine were analyzed in order to determine the contamination of heavy metals and the contamination intensity. In fact, the aim of this research was to evaluate the rate of heavy metals contamination (Co, Mo, Zn, Cr, Mn, Ni, Pb, Ti and Fe) in the sediments of Sarcheshmeh copper mine, which conduce to the tailing dam. In this paper, the contamination indices comprising contamination factor, pollution load index, enrichment factor and geoaccumulation index were used to evaluate the heavy metals distribution in the sediments of the area. The amounts of Enrichment Factor (Cobalt: 0.95, Copper: 16.63, Molybdenum: 3.84, Zinc: 1.95, Chrome: 0.87, Manganese: 1.27, Nickel: 0.36, Lead: 1.62, Titanium: 0.83 and Iron: 10.01) and the concentrations of heavy metals were evaluated by considerable number of samples. With respect to the calculation of Geoaccumulation Index for the heavy metals, the metals like Cu, Zn and Fe (Zn>Cu>Fe>Mo>Pb>Mn>Cr) stood in the pollutant limit. Correlation coefficient and hierarchical analysis were used to determine the source of sediments, dispersion pattern of metals and the environmental evaluation for the present situation. The results obtained from the geochemical studies, correct multivariate statistical analysis and calculation of contamination indices, enrichment factor, geoaccumulation index, contamination factor and the pollution load index verified the high concentrations of these metals. The results of the factor analysis and hierarchical analysis (rate of heavy metals limit) on the sediment samples of the study area are completely consistent with the results of the calculation of the Contamination Factor for the sampling stations.