بررسی تغییرات مکانی پراکنش سرب و کادمیوم با استفاده از تکنیک‌های زمین‌آمار و GIS (مطالعه موردی: اراضی اطراف مجتمع فولاد مبارکه)

Background and Objective: Population explosion and human ever-increasing demands has been resulted in industrialization which its mismanagement led to land pollution and consequently irreversible harm to nature and living organisms. Thus, it is an important measure to investigate the role of industrial centers in soil pollution. Materials and Methods: We studied Mobarakeh Steel Industrial Complex and surface soil samples were taken in a regular grid with a dimension of 2 km of a 10 km buffer zone. 49 samples were taken from different sites. Soil parameters such as texture, pH and salinity were analyzed and concentrations of heavy metals including lead and cadmium were measured using flame atomic absorption spectrometry. Results: Data analysis in the GIS environment using geostatistical techniques showed that a spherical model is a good model to investigate the spatial variability of lead and cadmium. The lowest and highest lead concentrations were 88.50 and 71.26 mg/kg and that of Cd was 6 and 26.1 mg/kg, respectively. No significant relationship between the heavy metals and soil properties (p>0.05). However, the correlation between two elements was significant (p<0.001). Among the various parameters, it was realized that wind direction played a great role in the distribution of lead and cadmium in the area. Conclusion: The results showed the role of the industrial complex in the environmental pollution. The hot spot for lead was eastern and southwestern parts of the steel complex and for Cd it was in eastern and western parts. Proper management and more accurate monitoring are necessary to protect the environment in the complex industry.