Extraction of mineral resources and mining can be lead to soil contamination by heavy metals. To determination of the origin of the metals in the sediments in Forumad chromite mine, the sediment samples were taken and analyzed using the sequential extraction method. Ana More
Extraction of mineral resources and mining can be lead to soil contamination by heavy metals. To determination of the origin of the metals in the sediments in Forumad chromite mine, the sediment samples were taken and analyzed using the sequential extraction method. Analysis of soil samples showed that the concentration of chromium and nickel in sediment is higher than that of global shale. Chromium and nickel in soil distribution map of the region shows that the highest concentration of chromium and nickel in samples from inside the mine tailings deposits of chromite Forumad been harvested according to the average concentration of chromium and nickel in the global shale, the top the amount of chromium in the sediment was attributable to mining activities. Our study shows that Nickel and Chromium with more than 45% concentration are interchangeable phase, which indicating anthropogenic source. Mining activity plays an important role in increasing the concentration of these elements as interchangeable phase. Cd, Pb, Zn and Fe with more than 30% concentration in residual phase, are related to lithogenic source. The results of the sequential extraction method are compatible with the pollution index in the area.
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Robat sefid region located in mashhad to torbat road and surrounded with ophiolite outcrop serpentine formation that could be mentioned as source of Lithogenic contamination. Considering importance of this matter, in this paper heavy metal studying and evalu More
Robat sefid region located in mashhad to torbat road and surrounded with ophiolite outcrop serpentine formation that could be mentioned as source of Lithogenic contamination. Considering importance of this matter, in this paper heavy metal studying and evaluation have been done in soil sources of robat sefid region. So heavy metal density in 11 soil samples have been studied and interoperated. For this aim multivariate statistical methods and index of geoaccumulation, enrichment factor, contamination factor and modified degree of contamination have been used. Correlations between elements have been evaluated with multivariate statistical methods (Pearson Correlation, Cluster Analysis and principle component analysis). Based on evaluations, ophiolite rocks (Serpentine، Gabbro، Dunite and Harzburgite) has been considered as Lithogenic source of elements in region. Based on index of geoaccumulation measurement for soil, Nicole has the highest rate of contamination in this region. Enrichment factor calculation shows that Nicole and Chromo have very high contamination and Cobalt has high contamination in this region. Also contamination factor measurement shows severe enrichment of Nicole in this region but region geology structures and ophiolite rocks weathering are the entrance source of these heavy metals and have Lithogenic source.
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