نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه خاکشناسی، پردیس علوم و تحقیقات خوزستان، دانشگاه آزاد اسلامی، اهواز، ایران
2 گروه خاکشناسی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
3 گروه زمین شناسی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The threshold concentration elements of heavy metals in different soils are variable. Utilizing the available criteria in different countries’ environmental Standards and codes, for investigating the pollution of these metals, may not be appropriate for other regions. For these reasons, it would be essential to determine the threshold concentration of heavy metals of any zone locally. In this research in order to determine the background concentration of three of those metals, Pb, Co and Ni, in surface soils of Khuzestan province of Iran the fractal method has been used. As far as this research is an experimental-practical study, to reach the purpose 87 samples from Khuzestan province soils have been sampled and analyzed by an inductively coupled spectroscopy (ICP-OES) method. The lowest and highest mean concentrations of heavy metals were obtained for Pb (9.09) and Ni (66.34) (mg/kg), respectively. In this study, after sorting the data from high to low and determining the frequency of each concentration, logarithmic plots of cumulative frequency of metal concentration versus area were drawn. By attaining the breaking points, the threshold of each metal was determined for the concentration-area method. Background values for Cobalt, Nickel and Lead were 6.93, 47.59 and 6.26 (mg/kg), respectively. The results have demonstrated that utilizing the fractal method in separating the amount of background from other geochemical elements is very appropriate
کلیدواژهها [English]