عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In recent years, expansion in industrial activities and urbanization has led to accumulation of high concentration of chromium in soil and water resources, which is a serious danger for environment and human health. In this research, potential of Portulaca oleracea in phytoremediation of Cr+6 polluted soil with different chromium concentration was studied. The plants were grown in pots containing soil concentrations of 0, 25, 50, 75 and 100 mg.kg- Cr+6(in the form of potassium dichromate) in greenhouse condition. At the end of vegetative growth period, concentration of Cr+3 and Cr+6 and also bioaccumulation factors in plant were measured. The results revealed that increase in soil chromium levels led to significant decrease in root and shoot dry matter and concentration of Cr+3 and Cr+6 increased in plant root and shoot. The increase of chromium concentration in soil, especially concentrations of more than 50 mg.kg-, reduced Translocation Factor of Cr+6 in plants. The total chromium concentrations exceeded 3400 and 1500 mg.kg- in root and shoots, in the treatment having 100 mg.kg- of Cr+6 in soil. Bioaccumulation factor in P. oleracea reached a value more than 1, which confirmed the role of p. oleracea as an effective Cr+6 accumulator in soils.