B Dahrazma; A Azarpeykan; S Modabberi; A Sayyareh
Abstract
Soil, as one of the important elements of lithosphere and a part of ecosystem plays a crucial role in the life cycle. The goal of the present research was to assess the influence of mineralization and abandoned Ay-ghalasi lead-zinc mine on the distribution of heavy metals and pollution in soil throughout ...
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Soil, as one of the important elements of lithosphere and a part of ecosystem plays a crucial role in the life cycle. The goal of the present research was to assess the influence of mineralization and abandoned Ay-ghalasi lead-zinc mine on the distribution of heavy metals and pollution in soil throughout the region. In this regard, 4 soil samples from tailing around the mine and 23 residual soil samples from whole basin, 5 to 20 cm depth, considering the stratigraphy of the region and the distance to the mine were taken. The ICP-OES techniques were employed to determine the concentration of heavy metals (Pb, Zn, As, Cd, Cu, and Ag) in tailing and residual soil samples. The results show that the mean concentration of the heavy metals namely Pb, Zn, As, Cd, Cu, and Ag are 9187.2, 9392.3, 630.8, 0.2, 1005.9 and 61.1 respectively (all in mg/kg), which all are higher than the mean of world soil (MWs) except for the Cd, and also higher than the Dutch standard except for the Ag. In the vicinity of the mine, the concentrations of the metals are high, decreasing with the distance from the mine and the mineral vein. The concentration of Pb, Zn, As, and Ag in the control samples were higher than the MWs and the Dutch standard that is an indication of high background concentration of these elements in the region. In terms of Geo-accumulation Index, Enrichment Factor, Contamination Factor, Contamination Degree, and Pollution Load Index, the soil of the mine area shows high to infinite level of contamination. The elements Pb, Zn, Cu, and Ag have a high Pearson correlation factor.
A Sarhangi; S Modabberi; S.R Mousavi Harami; M Zibayi
Abstract
The anthropogenic and natural contaminants are considered as the main factors threatening water resources and they are in direct connection to the public health and also threaten the development of water resources. The Latyan Dam reservoir is the main source of drinking water of Tehran metropolitan ...
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The anthropogenic and natural contaminants are considered as the main factors threatening water resources and they are in direct connection to the public health and also threaten the development of water resources. The Latyan Dam reservoir is the main source of drinking water of Tehran metropolitan area. In this paper, the environmental geochemistry of water and sediments have been studied. Eight sampling stations were selected in the lake and water samples were taken for measurement of trace elements in dissolved and particulate phases. In addition, sediment samples were taken at the same points by using a grab. The geochemical analysis performed by ICP-OES method showed that the concentration of potentially toxic metals were measured below the detection limit of the instrument and fall in the ranges of safe drinking water guidelines. The sediment samples showed concentrations within the quality guideline values except for As and Pb. The enrichment factor and Igeo were calculated for the sediment samples indicating that the sediments are not contaminated. Metal enrichment in sediments is however very strong compared to water samples and it is suggested that the adsorption processes have important role in sorption of metal contaminants onto the surface of sediment particles and it could be regarded as a potential for contamination if they return to water column in case of change in sediment physicochemical conditions.
